Network Working Group K. Norseth, Ed. Internet-Draft L-3 Communications Obsoletes: 1493 (if approved) E. Bell, Ed. Expires: April 25, 2005 3Com Europe Limited October 25, 2004 Definitions of Managed Objects for Bridges draft-ietf-bridge-bridgemib-smiv2-07.txt Status of this Memo This document is an Internet-Draft and is subject to all provisions of section 3 of RFC 3667. By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she become aware will be disclosed, in accordance with RFC 3668. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on April 25, 2005. Copyright Notice Copyright (C) The Internet Society (2004). Abstract This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP/IP based internets. In particular it defines objects for managing MAC bridges based on the IEEE 802.1D-1998 standard between Local Area Network (LAN) segments. Provisions are made for support of transparent bridging. Provisions are also made so that these objects apply to bridges Norseth & Bell Expires April 25, 2005 [Page 1]
Internet-Draft Bridge MIB October 2004 connected by subnetworks other than LAN segments. The MIB module presented in this memo is a translation of the BRIDGE-MIB defined in RFC 1493 to the SMIv2 syntax. This memo obsoletes RFC 1493. Table of Contents 1. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. The Internet-Standard Management Framework . . . . . . . . . . 3 3. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.1 Structure of the MIB Module . . . . . . . . . . . . . . . 4 3.1.1 The dot1dBase Group . . . . . . . . . . . . . . . . . 6 3.1.2 The dot1dStp Group . . . . . . . . . . . . . . . . . . 6 3.1.3 The dot1dSr Group . . . . . . . . . . . . . . . . . . 6 3.1.4 The dot1dTp Group . . . . . . . . . . . . . . . . . . 7 3.1.5 The dot1dStatic Group . . . . . . . . . . . . . . . . 7 3.2 Relationship to Other MIB Modules . . . . . . . . . . . . 7 3.2.1 Relationship to the SNMPv2-MIB . . . . . . . . . . . . 7 3.2.2 Relationship to the IF-MIB . . . . . . . . . . . . . . 7 3.3 Textual Conventions . . . . . . . . . . . . . . . . . . . 8 4. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 8 5. Security Considerations . . . . . . . . . . . . . . . . . . . 39 6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 40 7. Changes from RFC 1493 . . . . . . . . . . . . . . . . . . . . 41 8. Open Issues . . . . . . . . . . . . . . . . . . . . . . . . . 41 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 41 9.1 Normative References . . . . . . . . . . . . . . . . . . . . 41 9.2 Informative References . . . . . . . . . . . . . . . . . . . 42 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 42 Intellectual Property and Copyright Statements . . . . . . . . 44 Norseth & Bell Expires April 25, 2005 [Page 2]
Internet-Draft Bridge MIB October 2004 1. Conventions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL", when they appear in this document, are to be interpreted as described in BCP 14, RFC 2119 [RFC2119]. 2. The Internet-Standard Management Framework For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 [RFC3410]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580]. 3. Overview A common device present in many networks is the Bridge. This device is used to connect Local Area Network segments below the network layer. There are two major modes defined for this bridging; transparent and source route. The transparent method of bridging is defined in the IEEE 802.1D specification [IEEE8021D]. This memo defines those objects needed for the management of a bridging entity operating in the transparent mode, as well as some objects applicable to all types of bridges. To be consistent with IAB directives and good engineering practice, an explicit attempt was made to keep this MIB module as simple as possible. This was accomplished by applying the following criteria to objects proposed for inclusion: 1. Start with a small set of essential objects and add only as further objects are needed. 2. Require objects be essential for either fault or configuration management. 3. Consider evidence of current use and/or utility. 4. Limit the total of objects. 5. Exclude objects which are simply derivable from others in this or other MIB modules. Norseth & Bell Expires April 25, 2005 [Page 3]
Internet-Draft Bridge MIB October 2004 6. Avoid causing critical sections to be heavily instrumented. The guideline that was followed is one counter per critical section per layer. 3.1 Structure of the MIB Module Objects in this MIB module are arranged into groups. Each group is organized as a set of related objects. The overall structure and assignment of objects to their groups is shown below. Where appropriate the corresponding IEEE 802.1D [IEEE8021D] management object name is also included. Bridge MIB Name IEEE 802.1D Name dot1dBridge dot1dBase BridgeAddress Bridge.BridgeAddress NumPorts Bridge.NumberOfPorts Type PortTable Port BridgePort.PortNumber IfIndex Circuit DelayExceededDiscards .DiscardTransitDelay MtuExceededDiscards .DiscardOnError dot1dStp ProtocolSpecification Priority SpanningTreeProtocol .BridgePriority TimeSinceTopologyChange .TimeSinceTopologyChange TopChanges .TopologyChangeCount DesignatedRoot .DesignatedRoot RootCost .RootCost RootPort .RootPort MaxAge .MaxAge HelloTime .HelloTime HoldTime .HoldTime ForwardDelay .ForwardDelay BridgeMaxAge .BridgeMaxAge BridgeHelloTime .BridgeHelloTime BridgeForwardDelay .BridgeForwardDelay PortTable Port SpanningTreeProtocolPort .PortNumber Priority .PortPriority State .SpanningTreeState Enable PathCost .PortPathCost Norseth & Bell Expires April 25, 2005 [Page 4]
Internet-Draft Bridge MIB October 2004 DesignatedRoot .DesignatedRoot DesignatedCost .DesignatedCost DesignatedBridge .DesignatedBridge DesignatedPort .DesignatedPort ForwardTransitions dot1dTp LearnedEntryDiscards BridgeFilter.DatabaseSize .NumDynamic,NumStatic AgingTime BridgeFilter.AgingTime FdbTable Address Port Status PortTable Port MaxInfo InFrames BridgePort.FramesReceived OutFrames .ForwardOutbound InDiscards .DiscardInbound dot1dStatic StaticTable Address ReceivePort AllowedToGoTo Status The following IEEE 802.1D management objects have not been included in the BRIDGE-MIB module for the indicated reasons. Norseth & Bell Expires April 25, 2005 [Page 5]
Internet-Draft Bridge MIB October 2004 IEEE 802.1D Object Disposition Bridge.BridgeName Same as sysDescr (SNMPv2-MIB) Bridge.BridgeUpTime Same as sysUpTime (SNMPv2-MIB) Bridge.PortAddresses Same as ifPhysAddress (IF-MIB) BridgePort.PortName Same as ifDescr (IF-MIB) BridgePort.PortType Same as ifType (IF-MIB) BridgePort.RoutingType Derivable from the implemented groups SpanningTreeProtocol .BridgeIdentifier Combination of dot1dStpPriority and dot1dBaseBridgeAddress .TopologyChange Since this is transitory, it is not considered useful. SpanningTreeProtocolPort .Uptime Same as ifLastChange (IF-MIB) .PortIdentifier Combination of dot1dStpPort and dot1dStpPortPriority .TopologyChangeAcknowledged Since this is transitory, it is not considered useful. .DiscardLackOfBuffers Redundant Transmission Priority These objects are not required as per the Pics Proforma and not considered useful. .TransmissionPriorityName .OutboundUserPriority .OutboundAccessPriority 3.1.1 The dot1dBase Group This mandatory group contains the objects which are applicable to all types of bridges. 3.1.2 The dot1dStp Group This group contains the objects that denote the bridge's state with respect to the Spanning Tree Protocol. If a node does not implemented the Spanning Tree Protocol, this group will not be implemented. 3.1.3 The dot1dSr Group This group contains the objects that describe the entity's state with respect to source route bridging. If source routing is not supported this group will not be implemented. This group is applicable to Norseth & Bell Expires April 25, 2005 [Page 6]
Internet-Draft Bridge MIB October 2004 source route only, and SRT bridges. This group will be described in a separate document applicable only to source route bridging. 3.1.4 The dot1dTp Group This group contains objects that describe the entity's state with respect to transparent bridging. If transparent bridging is not supported this group will not be implemented. This group is applicable to transparent only and SRT bridges. 3.1.5 The dot1dStatic Group This group contains objects that describe the entity's state with respect to destination-address filtering. If destination-address filtering is not supported this group will not be implemented. This group is applicable to any type of bridge which performs destination- address filtering. 3.2 Relationship to Other MIB Modules As described above, some IEEE 802.1D management objects have not been included in this MIB module because they overlap with objects in other MIB modules applicable to a bridge implementing this MIB. In particular, it is assumed that a bridge implementing the BRIDGE-MIB module will also implement (at least) the 'system' group of the SNMPv2-MIB [RFC3418] the 'interfaces' group of the IF-MIB [RFC2863]. 3.2.1 Relationship to the SNMPv2-MIB In the SNMPv2-MIB [RFC3418], the 'system' group is defined as being mandatory for all systems. Thus, those objects apply to the entity as a whole irrespective of whether the entity's sole functionality is bridging, or whether bridging is only a subset of the entity's functionality. 3.2.2 Relationship to the IF-MIB In the Interfaces Group MIB [RFC2863], the 'interfaces' group is defined as being mandatory for all systems and contains information on an entity's interfaces, where each interface is thought of as being attached to a `subnetwork'. (Note that this term is not to be confused with `subnet' which refers to an addressing partitioning scheme used in the Internet suite of protocols.) The term 'segment' is used in this memo to refer to such a subnetwork, whether it be an Ethernet segment, a 'ring', a WAN link, or even an X.25 virtual circuit. Implicit in this BRIDGE-MIB is the notion of ports on a bridge. Each Norseth & Bell Expires April 25, 2005 [Page 7]
Internet-Draft Bridge MIB October 2004 of these ports is associated with one interface of the 'interfaces' group, and in most situations, each port is associated with a different interface. However, there are situations in which multiple ports are associated with the same interface. An example of such a situation would be several ports each corresponding one-to-one with several X.25 virtual circuits but all on the same interface. Each port is uniquely identified by a port number. A port number has no mandatory relationship to an interface number, but in the simple case a port number will have the same value as the corresponding interface's interface number. Port numbers are in the range (1..dot1dBaseNumPorts). Some entities perform other functionality as well as bridging through the sending and receiving of data on their interfaces. In such situations, only a subset of the data sent/received on an interface is within the domain of the entity's bridging functionality. This subset is considered to be delineated according to a set of protocols, with some protocols being bridged, and other protocols not being bridged. For example, in an entity which exclusively performed bridging, all protocols would be considered as being bridged, whereas in an entity which performed IP routing on IP datagrams and only bridged other protocols, only the non-IP data would be considered as being bridged. Thus, this BRIDGE-MIB (and in particular, its counters) are applicable only to that subset of the data on an entity's interfaces which is sent/received for a protocol being bridged. All such data is sent/received via the ports of the bridge. 3.3 Textual Conventions This document introduces the textual conventions BridgeId and Timeout and imports the MacAddress textual convention from RFC 2579 [RFC2579]. Objects defined using these conventions are always encoded by means of the rules that define their primitive type. These textual conventions are adopted merely for the convenience of readers. 4. Definitions BRIDGE-MIB DEFINITIONS ::= BEGIN -- ---------------------------------------------------------- -- -- MIB for IEEE 802.1D devices -- ---------------------------------------------------------- -- IMPORTS MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE, Norseth & Bell Expires April 25, 2005 [Page 8]
Internet-Draft Bridge MIB October 2004 Counter32, Integer32, TimeTicks, mib-2 FROM SNMPv2-SMI TEXTUAL-CONVENTION, MacAddress FROM SNMPv2-TC MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP FROM SNMPv2-CONF InterfaceIndex FROM IF-MIB ; bridgeMIB MODULE-IDENTITY LAST-UPDATED "200410220000Z" ORGANIZATION "IETF Bridge MIB Working Group" CONTACT-INFO "Email: bridge-mib@ietf.org K.C. Norseth (Editor) L-3 Communications Tel: +1 801-594-2809 Email: kenyon.c.norseth@L-3com.com Postal: 640 N. 2200 West. Salt Lake City, Utah 84116-0850 Les Bell (Editor) 3Com Europe Limited Phone: +44 1442 438025 Email: Les_Bell@3Com.com Postal: 3Com Centre, Boundary Way Hemel Hempstead Herts. HP2 7YU UK Send comments to <bridge-mib@ietf.org>" DESCRIPTION "The Bridge MIB module for managing devices that support IEEE 802.1D. Copyright (C) The Internet Society (2004). This version of this MIB module is part of RFC XXXX; see the RFC itself for full legal notices." REVISION "200410220000Z" -- RFC Ed.: replace XXXX with actual RFC number and remove this note DESCRIPTION "Third revision, published as part of RFC XXXX. The MIB module has been converted to SMIv2 format. Conformance statements have been added and some description and reference clauses have been updated. Norseth & Bell Expires April 25, 2005 [Page 9]
Internet-Draft Bridge MIB October 2004 The object dot1dStpPortPathCost32 was added to support IEEE 802.1t and the permissible values of dot1dStpPriority and dot1dStpPortPriority have been clarified for bridges supporting IEEE 802.1t or IEEE 802.1w. The interpretation of dot1dStpTimeSinceTopologyChange has been clarified for bridges supporting the rapid spanning tree protocol (RSTP)." REVISION "199307310000Z" DESCRIPTION "Second revision, published as part of RFC 1493." REVISION "199112310000Z" DESCRIPTION "Initial revision, published as part of RFC 1286." ::= { dot1dBridge 8 } dot1dNotification OBJECT IDENTIFIER ::= { dot1dBridge 0 } -- ---------------------------------------------------------- -- -- Textual Conventions -- ---------------------------------------------------------- -- -- All representations of MAC addresses in this MIB Module use, -- as a textual convention (i.e. this convention does not affect -- their encoding), the data type MacAddress, defined in -- SNMPv2-TC. -- Similarly, all representations of Bridge-Id in this MIB -- module use, as a textual convention (i.e. this convention -- does not affect their encoding), the data type: BridgeId ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION "The Bridge-Identifier as used in the Spanning Tree Protocol to uniquely identify a bridge. Its first two octets (in network byte order) contain a priority value and its last 6 octets contain the MAC address used to refer to a bridge in a unique fashion (typically, the numerically smallest MAC address of all ports on the bridge)." SYNTAX OCTET STRING (SIZE (8)) -- Several objects in this MIB module represent values of timers -- used by the Spanning Tree Protocol. In this MIB, these -- timers have values in units of hundredths of a second (i.e. -- 1/100 secs). Norseth & Bell Expires April 25, 2005 [Page 10]
Internet-Draft Bridge MIB October 2004 -- These timers, when stored in a Spanning Tree Protocol's BPDU, -- are in units of 1/256 seconds. Note, however, that -- 802.1D-1998 specifies a settable granularity of no more -- than 1 second for these timers. To avoid ambiguity, a data -- type is defined here as a textual convention and all -- representation of these timers in this MIB module are defined -- using this data type. An algorithm is also defined for -- converting between the different units, to ensure a timer's -- value is not distorted by multiple conversions. -- The data type is: Timeout ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION "A STP timer in units of 1/100 seconds. To convert a Timeout value into a value in units of 1/256 seconds, the following algorithm should be used: b = floor( (n * 256) / 100) where: floor = quotient [ignore remainder] n is the value in 1/100 second units b is the value in 1/256 second units To convert the value from 1/256 second units back to 1/100 seconds, the following algorithm should be used: n = ceiling( (b * 100) / 256) where: ceiling = quotient [if remainder is 0], or quotient + 1 [if remainder is nonzero] n is the value in 1/100 second units b is the value in 1/256 second units Note: it is important that the arithmetic operations are done in the order specified (i.e., multiply first, divide second)." SYNTAX Integer32 -- ---------------------------------------------------------- -- dot1dBridge OBJECT IDENTIFIER ::= { mib-2 17 } -- ---------------------------------------------------------- -- -- groups in the Bridge MIB -- ---------------------------------------------------------- -- Norseth & Bell Expires April 25, 2005 [Page 11]
Internet-Draft Bridge MIB October 2004 dot1dBase OBJECT IDENTIFIER ::= { dot1dBridge 1 } dot1dStp OBJECT IDENTIFIER ::= { dot1dBridge 2 } dot1dSr OBJECT IDENTIFIER ::= { dot1dBridge 3 } -- separately documented dot1dTp OBJECT IDENTIFIER ::= { dot1dBridge 4 } dot1dStatic OBJECT IDENTIFIER ::= { dot1dBridge 5 } -- Groups defined in the Bridge MIB Extensions: -- pBridgeMIB MODULE-IDENTITY ::= { dot1dBridge 6 } -- qBridgeMIB MODULE-IDENTITY ::= { dot1dBridge 7 } -- The MODULE-IDENTITY for this MIB has been defined above as: -- bridgeMIB MODULE-IDENTITY ::= { dot1dBridge 8 } -- The MODULE-IDENTITY for the Source Routing MIB has been -- defined in that MIB as: -- srMIB MODULE-IDENTITY ::= { dot1dBridge 9 } -- Groups defined in the Source Routing MIB: -- dot1dPortPair OBJECT IDENTIFIER ::= { dot1dBridge 10 } dot1dConformance OBJECT IDENTIFIER ::= { bridgeMIB 1 } -- ---------------------------------------------------------- -- -- the dot1dBase group -- ---------------------------------------------------------- -- -- Implementation of the dot1dBase group is mandatory for all -- bridges. -- ---------------------------------------------------------- -- dot1dBaseBridgeAddress OBJECT-TYPE SYNTAX MacAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The MAC address used by this bridge when it must be referred to in a unique fashion. It is recommended that this be the numerically smallest MAC address of all ports that belong to this bridge. However it is only required to be unique. When concatenated with dot1dStpPriority a unique BridgeIdentifier is formed which is used in the Spanning Tree Protocol." REFERENCE "IEEE 802.1D-1998: clauses 14.4.1.1.3 and 7.12.5" ::= { dot1dBase 1 } Norseth & Bell Expires April 25, 2005 [Page 12]
Internet-Draft Bridge MIB October 2004 dot1dBaseNumPorts OBJECT-TYPE SYNTAX Integer32 UNITS "ports" MAX-ACCESS read-only STATUS current DESCRIPTION "The number of ports controlled by this bridging entity." REFERENCE "IEEE 802.1D-1998: clause 14.4.1.1.3" ::= { dot1dBase 2 } dot1dBaseType OBJECT-TYPE SYNTAX INTEGER { unknown(1), transparentOnly(2), sourcerouteOnly(3), srt(4) } MAX-ACCESS read-only STATUS current DESCRIPTION "Indicates what type of bridging this bridge can perform. If a bridge is actually performing a certain type of bridging this will be indicated by entries in the port table for the given type." ::= { dot1dBase 3 } -- ---------------------------------------------------------- -- -- The Generic Bridge Port Table -- ---------------------------------------------------------- -- dot1dBasePortTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot1dBasePortEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table that contains generic information about every port that is associated with this bridge. Transparent, source-route, and srt ports are included." ::= { dot1dBase 4 } dot1dBasePortEntry OBJECT-TYPE SYNTAX Dot1dBasePortEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A list of information for each port of the bridge." Norseth & Bell Expires April 25, 2005 [Page 13]
Internet-Draft Bridge MIB October 2004 REFERENCE "IEEE 802.1D-1998: clause 14.4.2, 14.6.1" INDEX { dot1dBasePort } ::= { dot1dBasePortTable 1 } Dot1dBasePortEntry ::= SEQUENCE { dot1dBasePort Integer32, dot1dBasePortIfIndex InterfaceIndex, dot1dBasePortCircuit OBJECT IDENTIFIER, dot1dBasePortDelayExceededDiscards Counter32, dot1dBasePortMtuExceededDiscards Counter32 } dot1dBasePort OBJECT-TYPE SYNTAX Integer32 (1..65535) MAX-ACCESS read-only STATUS current DESCRIPTION "The port number of the port for which this entry contains bridge management information." ::= { dot1dBasePortEntry 1 } dot1dBasePortIfIndex OBJECT-TYPE SYNTAX InterfaceIndex MAX-ACCESS read-only STATUS current DESCRIPTION "The value of the instance of the ifIndex object, defined in IF-MIB, for the interface corresponding to this port." ::= { dot1dBasePortEntry 2 } dot1dBasePortCircuit OBJECT-TYPE SYNTAX OBJECT IDENTIFIER MAX-ACCESS read-only STATUS current DESCRIPTION "For a port which (potentially) has the same value of dot1dBasePortIfIndex as another port on the same bridge, this object contains the name of an object instance unique to this port. For example, in the case where multiple ports correspond one-to-one with multiple X.25 Norseth & Bell Expires April 25, 2005 [Page 14]
Internet-Draft Bridge MIB October 2004 virtual circuits, this value might identify an (e.g., the first) object instance associated with the X.25 virtual circuit corresponding to this port. For a port which has a unique value of dot1dBasePortIfIndex, this object can have the value { 0 0 }." ::= { dot1dBasePortEntry 3 } dot1dBasePortDelayExceededDiscards OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of frames discarded by this port due to excessive transit delay through the bridge. It is incremented by both transparent and source route bridges." REFERENCE "IEEE 802.1D-1998: clause 14.6.1.1.3" ::= { dot1dBasePortEntry 4 } dot1dBasePortMtuExceededDiscards OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of frames discarded by this port due to an excessive size. It is incremented by both transparent and source route bridges." REFERENCE "IEEE 802.1D-1998: clause 14.6.1.1.3" ::= { dot1dBasePortEntry 5 } -- ---------------------------------------------------------- -- -- the dot1dStp group -- ---------------------------------------------------------- -- -- Implementation of the dot1dStp group is optional. It is -- implemented by those bridges that support the Spanning Tree -- Protocol. -- ---------------------------------------------------------- -- dot1dStpProtocolSpecification OBJECT-TYPE SYNTAX INTEGER { unknown(1), decLb100(2), ieee8021d(3) } Norseth & Bell Expires April 25, 2005 [Page 15]
Internet-Draft Bridge MIB October 2004 MAX-ACCESS read-only STATUS current DESCRIPTION "An indication of what version of the Spanning Tree Protocol is being run. The value 'decLb100(2)' indicates the DEC LANbridge 100 Spanning Tree protocol. IEEE 802.1D implementations will return 'ieee8021d(3)'. If future versions of the IEEE Spanning Tree Protocol are released that are incompatible with the current version a new value will be defined." ::= { dot1dStp 1 } dot1dStpPriority OBJECT-TYPE SYNTAX Integer32 (0..65535) MAX-ACCESS read-write STATUS current DESCRIPTION "The value of the write-able portion of the Bridge ID, i.e., the first two octets of the (8 octet long) Bridge ID. The other (last) 6 octets of the Bridge ID are given by the value of dot1dBaseBridgeAddress. On bridges supporting IEEE 802.1t or IEEE 802.1w, permissible values are 0-61440, in steps of 4096." REFERENCE "IEEE 802.1D-1998 clause 8.10.2, Table 8-4, IEEE 802.1t clause 8.10.2, Table 8-4, clause 14.3." ::= { dot1dStp 2 } dot1dStpTimeSinceTopologyChange OBJECT-TYPE SYNTAX TimeTicks UNITS "centi-seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "The time (in hundredths of a second) since the last time a topology change was detected by the bridge entity. For RSTP, this reports the time since the tcWhile timer for any port on this Bridge was nonzero." REFERENCE "IEEE 802.1D-1998 clause 14.8.1.1., IEEE 802.1w clause 14.8.1.1." ::= { dot1dStp 3 } dot1dStpTopChanges OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current Norseth & Bell Expires April 25, 2005 [Page 16]
Internet-Draft Bridge MIB October 2004 DESCRIPTION "The total number of topology changes detected by this bridge since the management entity was last reset or initialized." REFERENCE "IEEE 802.1D-1998 clause 14.8.1.1." ::= { dot1dStp 4 } dot1dStpDesignatedRoot OBJECT-TYPE SYNTAX BridgeId MAX-ACCESS read-only STATUS current DESCRIPTION "The bridge identifier of the root of the spanning tree as determined by the Spanning Tree Protocol as executed by this node. This value is used as the Root Identifier parameter in all Configuration Bridge PDUs originated by this node." REFERENCE "IEEE 802.1D-1998: clause 8.5.3.1" ::= { dot1dStp 5 } dot1dStpRootCost OBJECT-TYPE SYNTAX Integer32 MAX-ACCESS read-only STATUS current DESCRIPTION "The cost of the path to the root as seen from this bridge." REFERENCE "IEEE 802.1D-1998: clause 8.5.3.2" ::= { dot1dStp 6 } dot1dStpRootPort OBJECT-TYPE SYNTAX Integer32 MAX-ACCESS read-only STATUS current DESCRIPTION "The port number of the port which offers the lowest cost path from this bridge to the root bridge." REFERENCE "IEEE 802.1D-1998: clause 8.5.3.3" ::= { dot1dStp 7 } dot1dStpMaxAge OBJECT-TYPE SYNTAX Timeout UNITS "centi-seconds" MAX-ACCESS read-only Norseth & Bell Expires April 25, 2005 [Page 17]
Internet-Draft Bridge MIB October 2004 STATUS current DESCRIPTION "The maximum age of Spanning Tree Protocol information learned from the network on any port before it is discarded, in units of hundredths of a second. This is the actual value that this bridge is currently using." REFERENCE "IEEE 802.1D-1998: clause 8.5.3.4" ::= { dot1dStp 8 } dot1dStpHelloTime OBJECT-TYPE SYNTAX Timeout UNITS "centi-seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "The amount of time between the transmission of Configuration bridge PDUs by this node on any port when it is the root of the spanning tree or trying to become so, in units of hundredths of a second. This is the actual value that this bridge is currently using." REFERENCE "IEEE 802.1D-1998: clause 8.5.3.5" ::= { dot1dStp 9 } dot1dStpHoldTime OBJECT-TYPE SYNTAX Integer32 UNITS "centi-seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "This time value determines the interval length during which no more than two Configuration bridge PDUs shall be transmitted by this node, in units of hundredths of a second." REFERENCE "IEEE 802.1D-1998: clause 8.5.3.14" ::= { dot1dStp 10 } dot1dStpForwardDelay OBJECT-TYPE SYNTAX Timeout UNITS "centi-seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "This time value, measured in units of hundredths of a second, controls how fast a port changes its spanning state when moving towards the Forwarding state. The Norseth & Bell Expires April 25, 2005 [Page 18]
Internet-Draft Bridge MIB October 2004 value determines how long the port stays in each of the Listening and Learning states, which precede the Forwarding state. This value is also used, when a topology change has been detected and is underway, to age all dynamic entries in the Forwarding Database. [Note that this value is the one that this bridge is currently using, in contrast to dot1dStpBridgeForwardDelay which is the value that this bridge and all others would start using if/when this bridge were to become the root.]" REFERENCE "IEEE 802.1D-1998: clause 8.5.3.6" ::= { dot1dStp 11 } dot1dStpBridgeMaxAge OBJECT-TYPE SYNTAX Timeout (600..4000) UNITS "centi-seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The value that all bridges use for MaxAge when this bridge is acting as the root. Note that 802.1D-1998 specifies that the range for this parameter is related to the value of dot1dStpBridgeHelloTime. The granularity of this timer is specified by 802.1D-1998 to be 1 second. An agent may return a badValue error if a set is attempted to a value which is not a whole number of seconds." REFERENCE "IEEE 802.1D-1998: clause 8.5.3.8" ::= { dot1dStp 12 } dot1dStpBridgeHelloTime OBJECT-TYPE SYNTAX Timeout (100..1000) UNITS "centi-seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The value that all bridges use for HelloTime when this bridge is acting as the root. The granularity of this timer is specified by 802.1D-1998 to be 1 second. An agent may return a badValue error if a set is attempted to a value which is not a whole number of seconds." REFERENCE "IEEE 802.1D-1998: clause 8.5.3.9" ::= { dot1dStp 13 } dot1dStpBridgeForwardDelay OBJECT-TYPE Norseth & Bell Expires April 25, 2005 [Page 19]
Internet-Draft Bridge MIB October 2004 SYNTAX Timeout (400..3000) UNITS "centi-seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The value that all bridges use for ForwardDelay when this bridge is acting as the root. Note that 802.1D-1998 specifies that the range for this parameter is related to the value of dot1dStpBridgeMaxAge. The granularity of this timer is specified by 802.1D-1998 to be 1 second. An agent may return a badValue error if a set is attempted to a value which is not a whole number of seconds." REFERENCE "IEEE 802.1D-1998: clause 8.5.3.10" ::= { dot1dStp 14 } -- ---------------------------------------------------------- -- -- The Spanning Tree Port Table -- ---------------------------------------------------------- -- dot1dStpPortTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot1dStpPortEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table that contains port-specific information for the Spanning Tree Protocol." ::= { dot1dStp 15 } dot1dStpPortEntry OBJECT-TYPE SYNTAX Dot1dStpPortEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A list of information maintained by every port about the Spanning Tree Protocol state for that port." INDEX { dot1dStpPort } ::= { dot1dStpPortTable 1 } Dot1dStpPortEntry ::= SEQUENCE { dot1dStpPort Integer32, dot1dStpPortPriority Integer32, dot1dStpPortState Norseth & Bell Expires April 25, 2005 [Page 20]
Internet-Draft Bridge MIB October 2004 INTEGER, dot1dStpPortEnable INTEGER, dot1dStpPortPathCost Integer32, dot1dStpPortDesignatedRoot BridgeId, dot1dStpPortDesignatedCost Integer32, dot1dStpPortDesignatedBridge BridgeId, dot1dStpPortDesignatedPort OCTET STRING, dot1dStpPortForwardTransitions Counter32, dot1dStpPortPathCost32 Integer32 } dot1dStpPort OBJECT-TYPE SYNTAX Integer32 (1..65535) MAX-ACCESS read-only STATUS current DESCRIPTION "The port number of the port for which this entry contains Spanning Tree Protocol management information." REFERENCE "IEEE 802.1D-1998: clause 14.8.2.1.2" ::= { dot1dStpPortEntry 1 } dot1dStpPortPriority OBJECT-TYPE SYNTAX Integer32 (0..255) MAX-ACCESS read-write STATUS current DESCRIPTION "The value of the priority field which is contained in the first (in network byte order) octet of the (2 octet long) Port ID. The other octet of the Port ID is given by the value of dot1dStpPort. On bridges supporting IEEE 802.1t or IEEE 802.1w, permissible values are 0-240, in steps of 16." REFERENCE "IEEE 802.1D-1998 clause 8.10.2, Table 8-4, IEEE 802.1t clause 8.10.2, Table 8-4, clause 14.3." ::= { dot1dStpPortEntry 2 } dot1dStpPortState OBJECT-TYPE SYNTAX INTEGER { Norseth & Bell Expires April 25, 2005 [Page 21]
Internet-Draft Bridge MIB October 2004 disabled(1), blocking(2), listening(3), learning(4), forwarding(5), broken(6) } MAX-ACCESS read-only STATUS current DESCRIPTION "The port's current state as defined by application of the Spanning Tree Protocol. This state controls what action a port takes on reception of a frame. If the bridge has detected a port that is malfunctioning it will place that port into the broken(6) state. For ports which are disabled (see dot1dStpPortEnable), this object will have a value of disabled(1)." REFERENCE "IEEE 802.1D-1998: clause 8.5.5.2" ::= { dot1dStpPortEntry 3 } dot1dStpPortEnable OBJECT-TYPE SYNTAX INTEGER { enabled(1), disabled(2) } MAX-ACCESS read-write STATUS current DESCRIPTION "The enabled/disabled status of the port." REFERENCE "IEEE 802.1D-1998: clause 8.5.5.2" ::= { dot1dStpPortEntry 4 } dot1dStpPortPathCost OBJECT-TYPE SYNTAX Integer32 (1..65535) MAX-ACCESS read-write STATUS deprecated DESCRIPTION "The contribution of this port to the path cost of paths towards the spanning tree root which include this port. 802.1D-1998 recommends that the default value of this parameter be in inverse proportion to the speed of the attached LAN. New implementations should use dot1dStpPortPathCost32" REFERENCE "IEEE 802.1D-1998: clause 8.5.5.3" Norseth & Bell Expires April 25, 2005 [Page 22]
Internet-Draft Bridge MIB October 2004 ::= { dot1dStpPortEntry 5 } dot1dStpPortDesignatedRoot OBJECT-TYPE SYNTAX BridgeId MAX-ACCESS read-only STATUS current DESCRIPTION "The unique Bridge Identifier of the Bridge recorded as the Root in the Configuration BPDUs transmitted by the Designated Bridge for the segment to which the port is attached." REFERENCE "IEEE 802.1D-1998: clause 8.5.5.4" ::= { dot1dStpPortEntry 6 } dot1dStpPortDesignatedCost OBJECT-TYPE SYNTAX Integer32 MAX-ACCESS read-only STATUS current DESCRIPTION "The path cost of the Designated Port of the segment connected to this port. This value is compared to the Root Path Cost field in received bridge PDUs." REFERENCE "IEEE 802.1D-1998: clause 8.5.5.5" ::= { dot1dStpPortEntry 7 } dot1dStpPortDesignatedBridge OBJECT-TYPE SYNTAX BridgeId MAX-ACCESS read-only STATUS current DESCRIPTION "The Bridge Identifier of the bridge which this port considers to be the Designated Bridge for this port's segment." REFERENCE "IEEE 802.1D-1998: clause 8.5.5.6" ::= { dot1dStpPortEntry 8 } dot1dStpPortDesignatedPort OBJECT-TYPE SYNTAX OCTET STRING (SIZE (2)) MAX-ACCESS read-only STATUS current DESCRIPTION "The Port Identifier of the port on the Designated Bridge for this port's segment." REFERENCE "IEEE 802.1D-1998: clause 8.5.5.7" Norseth & Bell Expires April 25, 2005 [Page 23]
Internet-Draft Bridge MIB October 2004 ::= { dot1dStpPortEntry 9 } dot1dStpPortForwardTransitions OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times this port has transitioned from the Learning state to the Forwarding state." ::= { dot1dStpPortEntry 10 } dot1dStpPortPathCost32 OBJECT-TYPE SYNTAX Integer32 (1..200000000) MAX-ACCESS read-write STATUS current DESCRIPTION "The contribution of this port to the path cost of paths towards the spanning tree root which include this port. 802.1D-1998 recommends that the default value of this parameter be in inverse proportion to the speed of the attached LAN. Replacement for deprecated object dot1dStpPortPathCost." REFERENCE "IEEE 802.1t clause 8.10.2, Table 8-5." ::= { dot1dStpPortEntry 11 } -- ---------------------------------------------------------- -- -- the dot1dTp group -- ---------------------------------------------------------- -- -- Implementation of the dot1dTp group is optional. It is -- implemented by those bridges that support the transparent -- bridging mode. A transparent or SRT bridge will implement -- this group. -- ---------------------------------------------------------- -- dot1dTpLearnedEntryDiscards OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of Forwarding Database entries, which have been or would have been learnt, but have been discarded due to a lack of space to store them in the Forwarding Database. If this counter is increasing, it indicates that the Forwarding Database is regularly becoming full (a condition which has unpleasant performance effects on the subnetwork). If this counter Norseth & Bell Expires April 25, 2005 [Page 24]
Internet-Draft Bridge MIB October 2004 has a significant value but is not presently increasing, it indicates that the problem has been occurring but is not persistent." REFERENCE "IEEE 802.1D-1998: clause 14.7.1.1.3" ::= { dot1dTp 1 } dot1dTpAgingTime OBJECT-TYPE SYNTAX Integer32 (10..1000000) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The timeout period in seconds for aging out dynamically learned forwarding information. 802.1D-1998 recommends a default of 300 seconds." REFERENCE "IEEE 802.1D-1998: clause 14.7.1.1.3" ::= { dot1dTp 2 } -- ---------------------------------------------------------- -- -- The Forwarding Database for Transparent Bridges -- ---------------------------------------------------------- -- dot1dTpFdbTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot1dTpFdbEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table that contains information about unicast entries for which the bridge has forwarding and/or filtering information. This information is used by the transparent bridging function in determining how to propagate a received frame." ::= { dot1dTp 3 } dot1dTpFdbEntry OBJECT-TYPE SYNTAX Dot1dTpFdbEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Information about a specific unicast MAC address for which the bridge has some forwarding and/or filtering information." INDEX { dot1dTpFdbAddress } ::= { dot1dTpFdbTable 1 } Norseth & Bell Expires April 25, 2005 [Page 25]
Internet-Draft Bridge MIB October 2004 Dot1dTpFdbEntry ::= SEQUENCE { dot1dTpFdbAddress MacAddress, dot1dTpFdbPort Integer32, dot1dTpFdbStatus INTEGER } dot1dTpFdbAddress OBJECT-TYPE SYNTAX MacAddress MAX-ACCESS read-only STATUS current DESCRIPTION "A unicast MAC address for which the bridge has forwarding and/or filtering information." REFERENCE "IEEE 802.1D-1998: clause 7.9.1, 7.9.2" ::= { dot1dTpFdbEntry 1 } dot1dTpFdbPort OBJECT-TYPE SYNTAX Integer32 MAX-ACCESS read-only STATUS current DESCRIPTION "Either the value '0', or the port number of the port on which a frame having a source address equal to the value of the corresponding instance of dot1dTpFdbAddress has been seen. A value of '0' indicates that the port number has not been learned but that the bridge does have some forwarding/filtering information about this address (e.g. in the dot1dStaticTable). Implementors are encouraged to assign the port value to this object whenever it is learned even for addresses for which the corresponding value of dot1dTpFdbStatus is not learned(3)." ::= { dot1dTpFdbEntry 2 } dot1dTpFdbStatus OBJECT-TYPE SYNTAX INTEGER { other(1), invalid(2), learned(3), self(4), mgmt(5) } MAX-ACCESS read-only Norseth & Bell Expires April 25, 2005 [Page 26]
Internet-Draft Bridge MIB October 2004 STATUS current DESCRIPTION "The status of this entry. The meanings of the values are: other(1) - none of the following. This would include the case where some other MIB object (not the corresponding instance of dot1dTpFdbPort, nor an entry in the dot1dStaticTable) is being used to determine if and how frames addressed to the value of the corresponding instance of dot1dTpFdbAddress are being forwarded. invalid(2) - this entry is not longer valid (e.g., it was learned but has since aged-out), but has not yet been flushed from the table. learned(3) - the value of the corresponding instance of dot1dTpFdbPort was learned, and is being used. self(4) - the value of the corresponding instance of dot1dTpFdbAddress represents one of the bridge's addresses. The corresponding instance of dot1dTpFdbPort indicates which of the bridge's ports has this address. mgmt(5) - the value of the corresponding instance of dot1dTpFdbAddress is also the value of an existing instance of dot1dStaticAddress." ::= { dot1dTpFdbEntry 3 } -- ---------------------------------------------------------- -- -- Port Table for Transparent Bridges -- ---------------------------------------------------------- -- dot1dTpPortTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot1dTpPortEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table that contains information about every port that is associated with this transparent bridge." ::= { dot1dTp 4 } dot1dTpPortEntry OBJECT-TYPE SYNTAX Dot1dTpPortEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A list of information for each port of a transparent bridge." Norseth & Bell Expires April 25, 2005 [Page 27]
Internet-Draft Bridge MIB October 2004 INDEX { dot1dTpPort } ::= { dot1dTpPortTable 1 } Dot1dTpPortEntry ::= SEQUENCE { dot1dTpPort Integer32, dot1dTpPortMaxInfo Integer32, dot1dTpPortInFrames Counter32, dot1dTpPortOutFrames Counter32, dot1dTpPortInDiscards Counter32 } dot1dTpPort OBJECT-TYPE SYNTAX Integer32 (1..65535) MAX-ACCESS read-only STATUS current DESCRIPTION "The port number of the port for which this entry contains Transparent bridging management information." ::= { dot1dTpPortEntry 1 } -- It would be nice if we could use ifMtu as the size of the -- largest INFO field, but we can't because ifMtu is defined -- to be the size that the (inter-)network layer can use which -- can differ from the MAC layer (especially if several layers -- of encapsulation are used). dot1dTpPortMaxInfo OBJECT-TYPE SYNTAX Integer32 MAX-ACCESS read-only STATUS current DESCRIPTION "The maximum size of the INFO (non-MAC) field that this port will receive or transmit." ::= { dot1dTpPortEntry 2 } dot1dTpPortInFrames OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "The number of frames that have been received by this Norseth & Bell Expires April 25, 2005 [Page 28]
Internet-Draft Bridge MIB October 2004 port from its segment. Note that a frame received on the interface corresponding to this port is only counted by this object if and only if it is for a protocol being processed by the local bridging function, including bridge management frames." REFERENCE "IEEE 802.1D-1998: clause 14.6.1.1.3" ::= { dot1dTpPortEntry 3 } dot1dTpPortOutFrames OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "The number of frames that have been transmitted by this port to its segment. Note that a frame transmitted on the interface corresponding to this port is only counted by this object if and only if it is for a protocol being processed by the local bridging function, including bridge management frames." REFERENCE "IEEE 802.1D-1998: clause 14.6.1.1.3" ::= { dot1dTpPortEntry 4 } dot1dTpPortInDiscards OBJECT-TYPE SYNTAX Counter32 UNITS "frames" MAX-ACCESS read-only STATUS current DESCRIPTION "Count of valid frames received which were discarded (i.e., filtered) by the Forwarding Process." REFERENCE "IEEE 802.1D-1998: clause 14.6.1.1.3" ::= { dot1dTpPortEntry 5 } -- ---------------------------------------------------------- -- -- The Static (Destination-Address Filtering) Database -- ---------------------------------------------------------- -- -- Implementation of this group is optional. -- ---------------------------------------------------------- -- dot1dStaticTable OBJECT-TYPE SYNTAX SEQUENCE OF Dot1dStaticEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION Norseth & Bell Expires April 25, 2005 [Page 29]
Internet-Draft Bridge MIB October 2004 "A table containing filtering information configured into the bridge by (local or network) management specifying the set of ports to which frames received from specific ports and containing specific destination addresses are allowed to be forwarded. The value of zero in this table as the port number from which frames with a specific destination address are received, is used to specify all ports for which there is no specific entry in this table for that particular destination address. Entries are valid for unicast and for group/broadcast addresses." REFERENCE "IEEE 802.1D-1998: clause 14.7.2" ::= { dot1dStatic 1 } dot1dStaticEntry OBJECT-TYPE SYNTAX Dot1dStaticEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Filtering information configured into the bridge by (local or network) management specifying the set of ports to which frames received from a specific port and containing a specific destination address are allowed to be forwarded." REFERENCE "IEEE 802.1D-1998: clause 14.7.2" INDEX { dot1dStaticAddress, dot1dStaticReceivePort } ::= { dot1dStaticTable 1 } Dot1dStaticEntry ::= SEQUENCE { dot1dStaticAddress MacAddress, dot1dStaticReceivePort Integer32, dot1dStaticAllowedToGoTo OCTET STRING, dot1dStaticStatus INTEGER } dot1dStaticAddress OBJECT-TYPE SYNTAX MacAddress MAX-ACCESS read-create STATUS current DESCRIPTION "The destination MAC address in a frame to which this entry's filtering information applies. This object can take the value of a unicast address, a group address or the broadcast address." REFERENCE Norseth & Bell Expires April 25, 2005 [Page 30]
Internet-Draft Bridge MIB October 2004 "IEEE 802.1D-1998: clause 7.9.1, 7.9.2" ::= { dot1dStaticEntry 1 } dot1dStaticReceivePort OBJECT-TYPE SYNTAX Integer32 (0..65535) MAX-ACCESS read-create STATUS current DESCRIPTION "Either the value '0', or the port number of the port from which a frame must be received in order for this entry's filtering information to apply. A value of zero indicates that this entry applies on all ports of the bridge for which there is no other applicable entry." ::= { dot1dStaticEntry 2 } dot1dStaticAllowedToGoTo OBJECT-TYPE SYNTAX OCTET STRING (SIZE (0..512)) MAX-ACCESS read-create STATUS current DESCRIPTION "The set of ports to which frames received from a specific port and destined for a specific MAC address, are allowed to be forwarded. Each octet within the value of this object specifies a set of eight ports, with the first octet specifying ports 1 through 8, the second octet specifying ports 9 through 16, etc. Within each octet, the most significant bit represents the lowest numbered port, and the least significant bit represents the highest numbered port. Thus, each port of the bridge is represented by a single bit within the value of this object. If that bit has a value of '1' then that port is included in the set of ports; the port is not included if its bit has a value of '0'. (Note that the setting of the bit corresponding to the port from which a frame is received is irrelevant.) The default value of this object is a string of ones of appropriate length. The value of this object may exceed the required minimum maximum message size of some SNMP transport (484 bytes in case of SNMP over UDP, see RFC 3417 section 3.2). SNMP engines on bridges supporting a large number of ports must support appropriate maximum message sizes." ::= { dot1dStaticEntry 3 } dot1dStaticStatus OBJECT-TYPE SYNTAX INTEGER { other(1), Norseth & Bell Expires April 25, 2005 [Page 31]
Internet-Draft Bridge MIB October 2004 invalid(2), permanent(3), deleteOnReset(4), deleteOnTimeout(5) } MAX-ACCESS read-create STATUS current DESCRIPTION "This object indicates the status of this entry. The default value is permanent(3). other(1) - this entry is currently in use but the conditions under which it will remain so are different from each of the following values. invalid(2) - writing this value to the object removes the corresponding entry. permanent(3) - this entry is currently in use and will remain so after the next reset of the bridge. deleteOnReset(4) - this entry is currently in use and will remain so until the next reset of the bridge. deleteOnTimeout(5) - this entry is currently in use and will remain so until it is aged out." ::= { dot1dStaticEntry 4 } -- ---------------------------------------------------------- -- -- Notifications for use by Bridges -- ---------------------------------------------------------- -- -- Notifications for the Spanning Tree Protocol -- ---------------------------------------------------------- -- newRoot NOTIFICATION-TYPE -- OBJECTS { } STATUS current DESCRIPTION "The newRoot trap indicates that the sending agent has become the new root of the Spanning Tree; the trap is sent by a bridge soon after its election as the new root, e.g., upon expiration of the Topology Change Timer immediately subsequent to its election. Implementation of this trap is optional." ::= { dot1dNotification 1 } topologyChange NOTIFICATION-TYPE -- OBJECTS { } STATUS current DESCRIPTION "A topologyChange trap is sent by a bridge when any of Norseth & Bell Expires April 25, 2005 [Page 32]
Internet-Draft Bridge MIB October 2004 its configured ports transitions from the Learning state to the Forwarding state, or from the Forwarding state to the Blocking state. The trap is not sent if a newRoot trap is sent for the same transition. Implementation of this trap is optional." ::= { dot1dNotification 2 } -- ---------------------------------------------------------- -- -- IEEE 802.1D MIB - Conformance Information -- ---------------------------------------------------------- -- dot1dGroups OBJECT IDENTIFIER ::= { dot1dConformance 1 } dot1dCompliances OBJECT IDENTIFIER ::= { dot1dConformance 2 } -- ---------------------------------------------------------- -- -- units of conformance -- ---------------------------------------------------------- -- -- ---------------------------------------------------------- -- -- the dot1dBase group -- ---------------------------------------------------------- -- dot1dBaseBridgeGroup OBJECT-GROUP OBJECTS { dot1dBaseBridgeAddress, dot1dBaseNumPorts, dot1dBaseType } STATUS current DESCRIPTION "Bridge level information for this device." ::= { dot1dGroups 1 } dot1dBasePortGroup OBJECT-GROUP OBJECTS { dot1dBasePort, dot1dBasePortIfIndex, dot1dBasePortCircuit, dot1dBasePortDelayExceededDiscards, dot1dBasePortMtuExceededDiscards } STATUS current DESCRIPTION "Information for each port on this device." ::= { dot1dGroups 2 } -- ---------------------------------------------------------- -- -- the dot1dStp group Norseth & Bell Expires April 25, 2005 [Page 33]
Internet-Draft Bridge MIB October 2004 -- ---------------------------------------------------------- -- dot1dStpBridgeGroup OBJECT-GROUP OBJECTS { dot1dStpProtocolSpecification, dot1dStpPriority, dot1dStpTimeSinceTopologyChange, dot1dStpTopChanges, dot1dStpDesignatedRoot, dot1dStpRootCost, dot1dStpRootPort, dot1dStpMaxAge, dot1dStpHelloTime, dot1dStpHoldTime, dot1dStpForwardDelay, dot1dStpBridgeMaxAge, dot1dStpBridgeHelloTime, dot1dStpBridgeForwardDelay } STATUS current DESCRIPTION "Bridge level Spanning Tree data for this device." ::= { dot1dGroups 3 } dot1dStpPortGroup OBJECT-GROUP OBJECTS { dot1dStpPort, dot1dStpPortPriority, dot1dStpPortState, dot1dStpPortEnable, dot1dStpPortPathCost, dot1dStpPortDesignatedRoot, dot1dStpPortDesignatedCost, dot1dStpPortDesignatedBridge, dot1dStpPortDesignatedPort, dot1dStpPortForwardTransitions } STATUS deprecated DESCRIPTION "Spanning Tree data for each port on this device." ::= { dot1dGroups 4 } dot1dStpPortGroup2 OBJECT-GROUP OBJECTS { dot1dStpPort, dot1dStpPortPriority, dot1dStpPortState, dot1dStpPortEnable, Norseth & Bell Expires April 25, 2005 [Page 34]
Internet-Draft Bridge MIB October 2004 dot1dStpPortDesignatedRoot, dot1dStpPortDesignatedCost, dot1dStpPortDesignatedBridge, dot1dStpPortDesignatedPort, dot1dStpPortForwardTransitions, dot1dStpPortPathCost32 } STATUS current DESCRIPTION "Spanning Tree data for each port on this device." ::= { dot1dGroups 5 } -- ---------------------------------------------------------- -- -- the dot1dTp group -- ---------------------------------------------------------- -- dot1dTpBridgeGroup OBJECT-GROUP OBJECTS { dot1dTpLearnedEntryDiscards, dot1dTpAgingTime } STATUS current DESCRIPTION "Bridge level Transparent Bridging data." ::= { dot1dGroups 6 } dot1dTpFdbGroup OBJECT-GROUP OBJECTS { dot1dTpFdbAddress, dot1dTpFdbPort, dot1dTpFdbStatus } STATUS current DESCRIPTION "Filtering Database information for the Bridge." ::= { dot1dGroups 7 } dot1dTpGroup OBJECT-GROUP OBJECTS { dot1dTpPort, dot1dTpPortMaxInfo, dot1dTpPortInFrames, dot1dTpPortOutFrames, dot1dTpPortInDiscards } STATUS current DESCRIPTION Norseth & Bell Expires April 25, 2005 [Page 35]
Internet-Draft Bridge MIB October 2004 "Dynamic Filtering Database information for each port of the Bridge." ::= { dot1dGroups 8 } -- ---------------------------------------------------------- -- -- The Static (Destination-Address Filtering) Database -- ---------------------------------------------------------- -- dot1dStaticGroup OBJECT-GROUP OBJECTS { dot1dStaticAddress, dot1dStaticReceivePort, dot1dStaticAllowedToGoTo, dot1dStaticStatus } STATUS current DESCRIPTION "Static Filtering Database information for each port of the Bridge." ::= { dot1dGroups 9 } -- ---------------------------------------------------------- -- -- The Trap Notification Group -- ---------------------------------------------------------- -- dot1dNotificationGroup NOTIFICATION-GROUP NOTIFICATIONS { newRoot, topologyChange } STATUS current DESCRIPTION "Group of objects describing notifications (traps)." ::= { dot1dGroups 10 } -- ---------------------------------------------------------- -- -- compliance statements -- ---------------------------------------------------------- -- bridgeCompliance MODULE-COMPLIANCE STATUS deprecated DESCRIPTION "The compliance statement for device support of bridging services. As per RFC1493" MODULE MANDATORY-GROUPS { dot1dBaseBridgeGroup, Norseth & Bell Expires April 25, 2005 [Page 36]
Internet-Draft Bridge MIB October 2004 dot1dBasePortGroup } GROUP dot1dStpBridgeGroup DESCRIPTION "Implementation of this group is mandatory for bridges that support the Spanning Tree Protocol." GROUP dot1dStpPortGroup DESCRIPTION "Implementation of this group is mandatory for bridges that support the Spanning Tree Protocol." GROUP dot1dTpBridgeGroup DESCRIPTION "Implementation of this group is mandatory for bridges that support the transparent bridging mode. A transparent or SRT bridge will implement this group." GROUP dot1dTpFdbGroup DESCRIPTION "Implementation of this group is mandatory for bridges that support the transparent bridging mode. A transparent or SRT bridge will implement this group." GROUP dot1dTpGroup DESCRIPTION "Implementation of this group is mandatory for bridges that support the transparent bridging mode. A transparent or SRT bridge will implement this group." GROUP dot1dStaticGroup DESCRIPTION "Implementation of this group is optional." GROUP dot1dNotificationGroup DESCRIPTION "Implementation of this group is optional." ::= { dot1dCompliances 1 } bridgeCompliance2 MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for device support of bridging services. This supports 32-bit Path Cost values and the more restricted bridge and port priorities, as per IEEE 802.1t." Norseth & Bell Expires April 25, 2005 [Page 37]
Internet-Draft Bridge MIB October 2004 MODULE MANDATORY-GROUPS { dot1dBaseBridgeGroup, dot1dBasePortGroup } GROUP dot1dStpBridgeGroup DESCRIPTION "Implementation of this group is mandatory for bridges that support the Spanning Tree Protocol." OBJECT dot1dStpPriority SYNTAX Integer32 (0|4096|8192|12288|16384|20480|24576 |28672|32768|36864|40960|45056|49152 |53248|57344|61440) DESCRIPTION "All possible values as per IEEE 802.1t." GROUP dot1dStpPortGroup2 DESCRIPTION "Implementation of this group is mandatory for bridges that support the Spanning Tree Protocol." OBJECT dot1dStpPortPriority SYNTAX Integer32 (0|16|32|48|64|80|96|112|128 |144|160|176|192|208|224|240) DESCRIPTION "All possible values as per IEEE 802.1t." GROUP dot1dTpBridgeGroup DESCRIPTION "Implementation of this group is mandatory for bridges that support the transparent bridging mode. A transparent or SRT bridge will implement this group." GROUP dot1dTpFdbGroup DESCRIPTION "Implementation of this group is mandatory for bridges that support the transparent bridging mode. A transparent or SRT bridge will implement this group." GROUP dot1dTpGroup DESCRIPTION "Implementation of this group is mandatory for bridges that support the transparent bridging mode. A transparent or SRT bridge will implement Norseth & Bell Expires April 25, 2005 [Page 38]
Internet-Draft Bridge MIB October 2004 this group." GROUP dot1dStaticGroup DESCRIPTION "Implementation of this group is optional." GROUP dot1dNotificationGroup DESCRIPTION "Implementation of this group is optional." ::= { dot1dCompliances 2 } END 5. Security Considerations There are a number of management objects defined in this MIB module that have a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. Some of the readable objects in this MIB module (i.e., objects with a MAX-ACCESS other than not-accessible) may be considered sensitive or vulnerable in some network environments. It is thus important to control even GET and/or NOTIFY access to these objects and possibly to even encrypt the values of these objects when sending them over the network via SNMP. These are the tables and objects and their sensitivity/vulnerability: o The writable objects dot1dStpPriority, dot1dStpBridgeMaxAge, dot1dStpBridgeHelloTime, dot1dStpBridgeForwardDelay, dot1dStpPortPriority, dot1dStpPortEnable, and dot1dStpPortPathCost influence the spanning tree protocol. Unauthorized write access to these objects can cause the spanning tree protocol to compute other default topologies or it can change the speed in which the spanning tree protocol reacts to failures. o The writable object dot1dTpAgingTime controls how fast dynamically learned forwarding information is aged out. Setting this object to a large value may simplify forwarding table overflow attacks. o The writable dot1dStaticTable provides a filtering mechanism controlling to which ports frames originating from a specific source may be forwarded. Write access to this table can be used to turn provisioned filtering off or to add filters to prevent rightful use of the network. Norseth & Bell Expires April 25, 2005 [Page 39]
Internet-Draft Bridge MIB October 2004 o The readable objects defined in the BRIDGE-MIB module provide information about the topology of a bridged network and the attached active stations. The addresses listed in the dot1dTpFdbTable usually reveal information about the manufacturer of the MAC hardware, which can be useful information for mounting other specific attacks. o The two notifications newRoot and topologyChange are emitted during spanning tree computation and may trigger management systems to inspect the status of bridges and to recompute internal topology information. Hence, forged notifications may cause management systems to perform unnecessary computations and to generate additional SNMP traffic directed to the bridges in a network. Forged notifications therefore may be part of a denial of service attack. SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPSec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB module. It is RECOMMENDED that implementers consider the security features as provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy). Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to enable cryptographic security. It is then a customer/operator responsibility to ensure that the SNMP entity giving access to an instance of this MIB module is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them. 6. Acknowledgments The MIB module presented in this memo is a translation of the BRIDGE-MIB defined in [RFC1493] to the SMIv2 syntax. The original authors of the SMIv1 module were E. Decker, P. Langille, A Rijsinghani and K. McCloghrie. Further acknowledgement is given to the members of the original Bridge Working Group in [RFC1493]. This document was produced on behalf of the Bridge MIB Working Group in the Operations and Management area of the Internet Engineering Task Force. The editors wish to thank the members of the Bridge MIB Working Group, especially Mike MacFadden and Bert Visscher for their many comments and suggestions which improved this effort. Juergen Schoenwaelder helped in finalizing the draft for publication. Norseth & Bell Expires April 25, 2005 [Page 40]
Internet-Draft Bridge MIB October 2004 7. Changes from RFC 1493 The following changes have been made from RFC 1493. 1. Translated the MIB definitions to use SMIv2. This includes the introduction of conformance statements. ASN.1 type definitions have been converted into textual-conventions and several units clauses were added. 2. The object dot1dStpPortPathCost32 was added to support IEEE 802.1t. 3. Permissible values for dot1dStpPriority and dot1dStpPortPriority have been clarified for bridges supporting IEEE 802.1t or IEEE 802.1w. 4. Interpretation of dot1dStpTimeSinceTopologyChange has been clarified for bridges supporting the rapid spanning tree protocol (RSTP). 5. Updated the introductionary boilerplate text, the security considerations section and the references to comply with the current IETF standards and guidelines. 6. Updated references to point to newer IEEE 802.1d documents. 7. Additions and clarifications in various description clauses. 8. Open Issues This list of open issues should be cleared and removed before this document hits the IESG. 1. The revised BRIDGE-MIB adds dot1dStpPortPathCost32 and makes it mandatory. I think this is broken since existing deployed implementations won't support that object and thus are not compliant. Can someone please explain in which situations the increased range of dot1dStpPortPathCost32 is actually needed? Is this only relevant for rapid spanning tree? In that case, I think the object should be conditionally mandatory for boxes that do rapid spanning tree and the old one stays current, probably with a special value to use in case dot1dStpPortPathCost32 actually has the larger path cost. 2. Rename "Authors' Addresses" to "Contact Information" and add original authors to the contact information section. 3. Is the unit of dot1dTpPortMaxInfo bytes? I guess so but it was never spelled out. Reading this object from bridges from different vendors lead to rather large and varying numbers... 9. References 9.1 Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Norseth & Bell Expires April 25, 2005 [Page 41]
Internet-Draft Bridge MIB October 2004 Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2578] McCloghrie, K., Perkins, D. and J. Schoenwaelder, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Perkins, D. and J. Schoenwaelder, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [RFC2580] McCloghrie, K., Perkins, D. and J. Schoenwaelder, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. [RFC3418] Presuhn, R., "Management Information Base (MIB) for the Simple Network Management Protocol (SNMP)", STD 62, RFC 3418, December 2002. [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB", RFC 2863, June 2000. [IEEE8021D] IEEE Project 802 Local and Metropolitan Area Networks, "ANSI/IEEE Standard 802.1D-1998 MAC Bridges", March 1998. 9.2 Informative References [RFC3410] Case, J., Mundy, R., Partain, D. and B. Stewart, "Introduction and Applicability Statements for Internet-Standard Management Framework", RFC 3410, December 2002. [RFC1493] Decker, E., Langille, P., Rijsinghani, A. and K. McCloghrie, "Definitions of Managed Objects for Bridges", RFC 1493. Authors' Addresses Kenyon C. Norseth (editor) L-3 Communications 640 N. 2200 West Salt Lake City, Utah 84116-0850 USA Phone: +1 801-594-2809 EMail: kenyon.c.norseth@L-3com.com Norseth & Bell Expires April 25, 2005 [Page 42]
Internet-Draft Bridge MIB October 2004 E. Bell (editor) 3Com Europe Limited 3Com Centre, Boundary Way Hemel Hempstead Herts. HP2 7YU UK Phone: +44 1442 438025 EMail: Les_Bell@3Com.com Norseth & Bell Expires April 25, 2005 [Page 43]
Internet-Draft Bridge MIB October 2004 Intellectual Property Statement The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Disclaimer of Validity This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Copyright Statement Copyright (C) The Internet Society (2004). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Norseth & Bell Expires April 25, 2005 [Page 44]
