INTERNET DRAFT Brian Haberman
April 1999 Randy Worzella
(IBM)
IP Version 6 Management Information Base for
the Multicast Listener Discovery Protocol
<draft-ietf-ipngwg-mld-mib-00.txt>
Status of This Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC 2026.
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
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The list of current Internet-Drafts can be accessed at
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Abstract
This document defines an experimental portion of
the Management Information Base (MIB) for use with network management
protocols in Internet Protocol Version 6 internets. Specifically,
this document is the MIB module which defines managed objects for
implementations of the Multicast Listener Discovery Protocol [MLD].
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Contents
1. Keywords 1
2. The SNMP Network Management Framework 1
2.1. Object Definition . . . . . . . . . . . . . . . . . . . . 1
3. Overview 2
4. Definitions 2
5. Security Considerations 10
6. References 11
7. Author's Address 12
8. Full Copyright Statement 12
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1. Keywords
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
2. The SNMP Network Management Framework
The SNMP Network Management Framework presently consists of five
major components :
- An overall architecture, described in RFC 2271 [RFC2271].
- Mechanisms for describing and naming objects and events for the
purpose of management. The first version of this Structure of
Management Information (SMI) is called SMIv1 and is
described in RFC 1155 [RFC1155], RFC 1212 [RFC1212], and RFC 1215
[RFC1215]. The second version, called SMIv2, is described in RFC
1902 [RFC1902], RFC 1903 [RFC1903], and RFC 1904 [RFC1904].
- Message protocols for transferring management information. The
first version of the SNMP message protocol is called SNMPv1 and
described in RFC 1157 [RFC1157]. A second version of the SNMP
message protocol, which is not an Internet standards track
protocol, is called SNMPv2c and described in RFC 1901 [RFC1901]
and RFC 1906 [RFC1906]. The third
version of the message protocol is called SNMPv3 and described in
RFC 1906 [RFC1906], RFC 2272 [RFC2272], and RFC 2274 [RFC2274].
- Protocol operations for accessing management
information. The first set of protocol operations and associated
PDU formats is described in RFC 1157 [RFC1157]. A second set
of protocol operations and associated PDU formats is described in
RFC 1905 [RFC1905].
- A set of fundamental applications described in RFC 2273 [RFC2273]
and the view-based access control mechanism described in RFC 2275
[RFC2275].
2.1. Object Definition
Managed objects are accessed via a virtual information store,
termed the Management Information Base or MIB. Objects in the MIB are
defined using the mechanisms defined in the SMI.
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This memo specifies a MIB module that is compliant to the SMIv2.
A MIB conforming to the SMIv1 can be produced through the appropriate
translations. The resulting translated MIB must be semantically
equivalent, except where objects or events are omitted because
no translation is possible (use of Counter64). Some machine readable
information in SMIv2 will be converted into textual descriptions in
SMIv1 during the translation process. However, this loss of machine
readable information is not considered to change the semantics of the
MIB.
3. Overview
This MIB module contains two tables :
1. the MLD Interface Table which contains one row for each interface
on which MLD is enabled.
2. the MLD Cache Table which contains
one row for each IPv6 Multicast group for which there are members
on a particular interface.
Both tables are intended to be implemented by hosts and routers.
Some objects in each table apply to routers only.
4. Definitions
MLD-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, experimental, Counter32, Gauge32,
Integer32, TimeTicks FROM SNMPv2-SMI
RowStatus, TruthValue FROM SNMPv2-TC
Ipv6Address FROM IPV6-TC
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF;
mldMIB MODULE-IDENTITY
LAST-UPDATED "9903091150Z"
ORGANIZATION "IETF IPNGWG Working Group."
CONTACT-INFO
" Brian Haberman
IBM Corporation
800 Park Offices Drive
Research Triangle Park, NC 27709
US
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Phone: +1 919 254 2673
EMail: haberman@raleigh.ibm.com"
DESCRIPTION
"The MIB module for MLD Management."
::= { experimental ?? }
mldMIBObjects OBJECT IDENTIFIER ::= { mldMIB 1 }
mld OBJECT IDENTIFIER ::= { mldMIBObjects 1 }
--
-- The MLD Interface Table
--
mldInterfaceTable OBJECT-TYPE
SYNTAX SEQUENCE OF MldInterfaceEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The (conceptual) table listing the interfaces on which MLD
is enabled."
::= { mld 1 }
mldInterfaceEntry OBJECT-TYPE
SYNTAX MldInterfaceEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry (conceptual row) representing an interface on
which MLD is enabled."
INDEX { mldInterfaceIfIndex }
::= { mldInterfaceTable 1 }
MldInterfaceEntry ::= SEQUENCE {
mldInterfaceIfIndex Integer32,
mldInterfaceQueryInterval Integer32,
mldInterfaceStatus RowStatus,
mldInterfaceQuerier Ipv6Address,
mldInterfaceQueryMaxResponseDelay Integer32,
mldInterfaceJoins Counter32,
mldInterfaceGroups Gauge32,
mldInterfaceRobustness Integer32,
mldInterfaceLastListenQueryIntvl Integer32,
mldInterfaceQuerierUpTime Integer32,
mldInterfaceQuerierExpiryTime Integer32
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}
mldInterfaceIfIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The ifIndex value of the interface for which MLD is
enabled."
::= { mldInterfaceEntry 1 }
mldInterfaceQueryInterval OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The frequency at which MLD Host-Query packets are
transmitted on this interface."
DEFVAL { 125 }
::= { mldInterfaceEntry 2 }
mldInterfaceStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The activation of a row enables MLD on the interface. The
destruction of a row disables MLD on the interface."
::= { mldInterfaceEntry 3 }
mldInterfaceQuerier OBJECT-TYPE
SYNTAX Ipv6Address
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The address of the MLD Querier on the IPv6 subnet to which
this interface is attached."
::= { mldInterfaceEntry 4 }
mldInterfaceQueryMaxResponseDelay OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The maximum query response time advertised in MLD
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queries on this interface."
DEFVAL { 10 }
::= { mldInterfaceEntry 5 }
mldInterfaceJoins OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times a group membership has been added on
this interface; that is, the number of times an entry for
this interface has been added to the Cache Table. This
object gives an indication of the amount of MLD activity
over time."
::= { mldInterfaceEntry 6 }
mldInterfaceGroups OBJECT-TYPE
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The current number of entries for this interface in the
Cache Table."
::= { mldInterfaceEntry 7 }
mldInterfaceRobustness OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The Robustness Variable allows tuning for the expected
packet loss on a subnet. If a subnet is expected to be
lossy, the Robustness Variable may be increased. MLD is
robust to (Robustness Variable-1) packet losses."
DEFVAL { 2 }
::= { mldInterfaceEntry 8 }
mldInterfaceLastListenQueryIntvl OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The Last Member Query Interval is the Max Response Delay
inserted into Group-Specific Queries sent in response to
Leave Group messages, and is also the amount of time between
Group-Specific Query messages. This value may be tuned to
modify the leave latency of the network. A reduced value
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results in reduced time to detect the loss of the last
member of a group."
DEFVAL { 1 }
::= { mldInterfaceEntry 9 }
mldInterfaceQuerierUpTime OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of seconds since mldInterfaceQuerier was last
changed."
::= { mldInterfaceEntry 10 }
mldInterfaceQuerierExpiryTime OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of seconds remaining before the Other Querier
Present Timer expires. If the local system is the querier,
the value of this object is zero."
::= { mldInterfaceEntry 11 }
--
-- The MLD Cache Table
--
mldCacheTable OBJECT-TYPE
SYNTAX SEQUENCE OF mldCacheEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The (conceptual) table listing the IPv6 multicast groups for
which there are members on a particular interface."
::= { mld 2 }
mldCacheEntry OBJECT-TYPE
SYNTAX MldCacheEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry (conceptual row) in the mldCacheTable."
INDEX { mldCacheAddress, mldCacheIfIndex }
::= { mldCacheTable 1 }
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MldCacheEntry ::= SEQUENCE {
mldCacheAddress Ipv6Address,
mldCacheIfIndex Integer32,
mldCacheSelf TruthValue,
mldCacheLastReporter Ipv6Address,
mldCacheUpTime TimeTicks,
mldCacheExpiryTime TimeTicks,
mldCacheStatus RowStatus
}
mldCacheAddress OBJECT-TYPE
SYNTAX Ipv6Address
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The IPv6 multicast group address for which this entry
contains information."
::= { mldCacheEntry 1 }
mldCacheIfIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The interface for which this entry contains information for
an IPv6 multicast group address."
::= { mldCacheEntry 2 }
mldCacheSelf OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"An indication of whether the local system is a member of
this group address on this interface."
DEFVAL { true }
::= { mldCacheEntry 3 }
mldCacheLastReporter OBJECT-TYPE
SYNTAX Ipv6Address
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The IPv6 address of the source of the last membership report
received for this IPv6 Multicast group address on this
interface. If no membership report has been received, this
object has the value 0:0."
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::= { mldCacheEntry 4 }
mldCacheUpTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time since the system joined this group address, or
zero if the system is not currently a member."
::= { mldCacheEntry 5 }
mldCacheExpiryTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The minimum amount of time remaining before this entry will
be aged out."
::= { mldCacheEntry 6 }
mldCacheStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this entry."
::= { mldCacheEntry 7 }
-- conformance information
mldMIBConformance
OBJECT IDENTIFIER ::= { mldMIB 2 }
mldMIBCompliances
OBJECT IDENTIFIER ::= { mldMIBConformance 1 }
mldMIBGroups OBJECT IDENTIFIER ::= { mldMIBConformance 2 }
-- compliance statements
mldHostMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for hosts running MLD and
implementing the MLD MIB."
MODULE -- this module
MANDATORY-GROUPS { mldBaseMIBGroup,
mldHostMIBGroup
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}
OBJECT mldInterfaceStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { mldMIBCompliances 1 }
mldRouterMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for routers running MLD and
implementing the MLD MIB."
MODULE -- this module
MANDATORY-GROUPS { mldBaseMIBGroup,
mldRouterMIBGroup
}
OBJECT mldInterfaceStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { mldMIBCompliances 2 }
-- units of conformance
mldBaseMIBGroup OBJECT-GROUP
OBJECTS { mldCacheSelf, mldCacheLastReporter,
mldCacheStatus, mldInterfaceStatus
}
STATUS current
DESCRIPTION
"The basic collection of objects providing management of
MLD."
::= { mldMIBGroups 1 }
mldRouterMIBGroup OBJECT-GROUP
OBJECTS { mldCacheUpTime, mldCacheExpiryTime,
mldInterfaceQueryInterval,
mldInterfaceQuerier,
mldInterfaceQueryMaxResponseDelay,
mldInterfaceRobustness,
mldInterfaceJoins, mldInterfaceGroups,
mldInterfaceLastListenQueryIntvl,
mldInterfaceQuerierUpTime,
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mldInterfaceQuerierExpiryTime
}
STATUS current
DESCRIPTION
"A collection of additional objects for management of MLD
in routers."
::= { mldMIBGroups 2 }
mldHostMIBGroup OBJECT-GROUP
OBJECTS { mldInterfaceQuerier
}
STATUS current
DESCRIPTION
"A collection of additional objects for management of MLD
in hosts."
::= { mldMIBGroups 3 }
END
5. Security Considerations
Certain management information defined in this MIB MAY be considered
sensitive in some network environments. Therefore, authentication of
received SNMP requests and controlled access to management
information SHOULD be employed in such environments. The method for
this authentication is a function of the SNMP Administrative
Framework, and has not been expanded by this MIB.
Several objects in this MIB allow write access or provide for row
creation. Allowing this support in a non-secure environment can have
a negative effect
on network operations. It is RECOMMENDED that implementers seriously
consider whether set operations or row creation
be allowed without providing, at a minimum, authentication of request
origin. It is RECOMMENDED that without such support that objects be
implemented as read-only.
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6. References
[MLD] S. Deering, W. Fenner, B. Haberman, "Multicast
Listener Discovery (MLD) for IPv6", RFC ???,
??? 1999.
[RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, BCP14, March 1997.
[RFC2271] D. Harrington, R. Presuhn, B. Wijnen, "An Architecture
for Describing SNMP Management Frameworks", RFC 2271,
January 1998.
[RFC1155] M. Rose and K. McCloghrie, "Structure and Identification
of Management Information for TCP/IP-based Internets",
RFC 1155, May 1990.
[RFC1212] M. Rose and K. McCloghrie, "Concise MIB Definitions",
RFC 1212, March 1991.
[RFC1215] M. Rose, "A Convention for Defining Traps for use with
the SNMP", RFC 1215, March 1991.
[RFC1902] K. McCloghrie, "Structure of Management Information
for version 2 of the Simple Network Management
Protocol (SNMPv2)", RFC 1902, January 1996.
[RFC1903] J. Case, K. McCloghrie, M. Rose, and S. Waldbusser,
"Textual Conventions for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1903, January 1996.
[RFC1904] J. Case, K. McCloghrie, M. Rose, and S. Waldbusser,
"Conformance Statements for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC 1904,
January 1996.
[RFC1157] J. Case, M. Fedor, M. Schoffstall, and J. Davin,
"A Simple Network Management Protocol (SNMP)", STD 15,
RFC 1157, May 1990.
[RFC1901] J. Case, K. McCloghrie, M. Rose, and S. Waldbusser,
"Introduction to Community-bsed SNMPv2", RFC 1901,
January 1996.
[RFC1906] J. Case, K. McCloghrie, M. Rose, and S. Waldbusser,
"Transport Mappings for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1906, January 1996.
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[RFC2272] J. Case, D. Harrington, R. Presuhn, and B. Wijnen,
"Message Processing and Dispatching for the Simple Network
Management Protocol (SNMPv2)", RFC 2272, January 1998.
[RFC2274] U. Blumenthal, and B. Wijnen, "User-based Security Model
(USM) for version 3 of the Simple Network Management
Protocol (SNMPv3)", RFC 2274, January 1998.
[RFC1905] J. Case, K. McCloghrie, M. Rose, S. Waldbusser,
"Protocol Operations for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC 1905,
January 1996.
[RFC2273] D. Levi, P. Meyer, and B. Stewart, "SNMPv3 Applications",
RFC 2273, January 1998.
[RFC2275] B. Wijnen, R. Presuhn, and K. McCloghrie, "View-based
Access Control Model (ACM) for the Simple Network
Management Protocol (SNMP)", RFC 2275, January 1998.
7. Author's Address
Brian Haberman
Randy Worzella
IBM Corporation
800 Park Office Drive
Research Triangle Park, NC 27709
USA
+1-919-254-2673
haberman@raleigh.ibm.com
+1-919-254-2202
worzella@us.ibm.com
8. Full Copyright Statement
Copyright (C) The Internet Society (1999). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain
it or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
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kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works.
However, this document itself may not be modified in any way, such as
by removing the copyright notice or references to the Internet
Society or other Internet organizations, except as needed for the
purpose of developing Internet standards in which case the procedures
for copyrights defined in the Internet Standards process must
be followed, or as required to translate it into languages other than
English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND
THE INTERNET ENGINEERING TASK FORCE DISCLAIMS 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.
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