IPNGWG Working Group B. Haberman
Internet Draft Nortel Networks
draft-ietf-ipngwg-mld-mib-02.txt R. Worzella
December 1999 IBM
Expires June 2000
IP Version 6 Management Information Base for
The Multicast Listener Discovery Protocol
Status of this Memo
This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Task
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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 that defines managed objects for implementations of the
Multicast Listener Discovery Protocol [MLD].
1.
Terminology
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].
2.
The SNMP Management Framework
The SNMP Management Framework presently consists of five major
components:
o An overall architecture, described in RFC 2571 [RFC2571].
o 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 described in STD
16, RFC 1155 [RFC1155], STD 16, RFC 1212 [RFC1212] and RFC 1215
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Internet Draft MIB for MLD November 1999
[RFC1215]. The second version, called SMIv2, is described in STD
58, RFC 2578 [RFC2578], RFC 2579 [RFC2579] and RFC 2580[RFC2580].
o Message protocols for transferring management information. The
first version of the SNMP message protocol is called SNMPv1 and
described in STD 15, 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 2572
[RFC2572] and RFC 2574 [RFC2574].
o Protocol operations for accessing management information. The
first set of protocol operations and associated PDU formats is
described in STD 15, RFC 1157 [RFC1157]. A second set of protocol
operations and associated PDU formats is described in RFC 1905
[RFC1905].
o A set of fundamental applications described in RFC 2573[RFC2573]
and the view-based access control mechanism described in RFC 2575
[RFC2575].
A more detailed introduction to the current SNMP Management Framework
can be found in RFC 2570 [RFC2570].
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.
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.
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.
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.
4.
Overview
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Internet Draft MIB for MLD November 1999
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.
5.
Definitions
MLD-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Counter32, Gauge32,
Integer32, TimeTicks, mib-2 FROM SNMPv2-SMI
RowStatus, TruthValue FROM SNMPv2-TC
Ipv6Address, Ipv6IfIndexOrZero FROM IPV6-TC
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF;
mldMIB MODULE-IDENTITY
LAST-UPDATED "9912171600Z"
ORGANIZATION "IETF IPNGWG Working Group."
CONTACT-INFO
" Brian Haberman
Nortel Networks
4309 Emperor Blvd.
Durham, NC 27703
USA
Phone: +1 919 992 4439
e-mail: haberman@nortelnetworks.com"
DESCRIPTION
"The MIB module for MLD Management."
REVISION "9912171600Z"
::= { mib-2 xx }
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 }
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Internet Draft MIB for MLD November 1999
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 Ipv6IfIndexOrZero,
mldInterfaceQueryInterval Integer32,
mldInterfaceStatus RowStatus,
mldInterfaceQuerier Ipv6Address,
mldInterfaceQueryMaxResponseDelay Integer32,
mldInterfaceJoins Counter32,
mldInterfaceGroups Gauge32,
mldInterfaceRobustness Integer32,
mldInterfaceLastListenQueryIntvl Integer32,
mldInterfaceQuerierUpTime TimeTicks,
mldInterfaceQuerierExpiryTime TimeTicks
}
mldInterfaceIfIndex OBJECT-TYPE
SYNTAX Ipv6IfIndexOrZero
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
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Internet Draft MIB for MLD November 1999
"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
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
results in reduced time to detect the loss of the last
Haberman, Worzella 5
Internet Draft MIB for MLD November 1999
member of a group."
DEFVAL { 1 }
::= { mldInterfaceEntry 9 }
mldInterfaceQuerierUpTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time since mldInterfaceQuerier was last changed."
::= { mldInterfaceEntry 10 }
mldInterfaceQuerierExpiryTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time 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 }
MldCacheEntry ::= SEQUENCE {
mldCacheAddress Ipv6Address,
mldCacheIfIndex Ipv6IfIndexOrZero,
mldCacheSelf TruthValue,
mldCacheLastReporter Ipv6Address,
mldCacheUpTime TimeTicks,
mldCacheExpiryTime TimeTicks,
mldCacheStatus RowStatus
}
mldCacheAddress OBJECT-TYPE
SYNTAX Ipv6Address
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
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Internet Draft MIB for MLD November 1999
"The IPv6 multicast group address for which this entry
contains information."
::= { mldCacheEntry 1 }
mldCacheIfIndex OBJECT-TYPE
SYNTAX Ipv6IfIndexOrZero
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.
::= { mldCacheEntry 4 }
mldCacheUpTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time elapsed since this entry was created."
::= { 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. A value of 0 indicates that the entry is only
present because mldCacheSelf is true and that if the router
left the group, this entry would be aged out immediately.
Note that some implementations may process membership
Reports from the local system in the same way as reports
From other hosts, so a value of 0 is not required."
::= { mldCacheEntry 6 }
mldCacheStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
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Internet Draft MIB for MLD November 1999
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
}
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,
mldCacheStatus, mldInterfaceStatus
}
STATUS current
DESCRIPTION
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Internet Draft MIB for MLD November 1999
"The basic collection of objects providing management of
MLD."
::= { mldMIBGroups 1 }
mldRouterMIBGroup OBJECT-GROUP
OBJECTS { mldCacheUpTime, mldCacheExpiryTime,
mldInterfaceQueryInterval,
mldInterfaceJoins, mldInterfaceGroups,
mldCacheLastReporter,
mldInterfaceQuerierUpTime,
mldInterfaceQuerierExpiryTime,
mldInterfaceQuerier,
mldInterfaceQueryMaxResponseTime,
mldInterfaceRobustness,
mldInterfaceLastMemQueryIntvl
}
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
6.
Security Considerations
There are a number of management objects defined in this MIB 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.
There are a number of managed objects in this MIB that may contain
sensitive information. These are:
o mldCacheSelf
o mldCacheLastReporter
It is thus important to control even GET access to these objects and
possibly to even encrypt the values of these objects when sending them
over the network via SNMP. Not all versions of SNMP provide features
for such a secure environment.
SNMPv1 by itself is not a secure environment. 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.
Haberman, Worzella 9
Internet Draft MIB for MLD November 1999
It is recommended that the implementers consider the security features
as provided by the SNMPv3 framework. Specifically, the use of the User-
based Security Model RFC 2574 [RFC2574] and the View-based Access
Control Model RFC 2575 [RFC2575] are recommended.
It is then a customer/user responsibility to ensure that the SNMP entity
giving access to an instance of this MIB, 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.
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.
7.
Acknowledgements
This MIB module is based on the IGMP MIB authored by Keith McCloghrie,
Dino Farinacci, and Dave Thaler. It was updated based on feedback from
the IPNGWG working group, Bert Wijnen, and Peder Norgaard.
8.
References
[MLD] S. Deering, W. Fenner, B. Haberman, "Multicast Listener
Discovery (MLD) for IPv6", RFC 2710, October 1999.
[RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, BCP14, March 1997.
[RFC2571] Harrington, D., Presuhn, R., and B. Wijnen, "An
Architecture for Describing SNMP Management Frameworks",
RFC 2571, April 1999.
[RFC1155] Rose, M., and K. McCloghrie, "Structure and Identification
of Management Information for TCP/IP-based Internets", STD
16, RFC 1155, May 1990.
[RFC1212] Rose, M., and K. McCloghrie, "Concise MIB Definitions",
STD 16, RFC 1212, March 1991.
[RFC1215] M. Rose, "A Convention for Defining Traps for use with the
SNMP", RFC 1215, March 1991.
[RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M., and S. Waldbusser, "Structure of Management
Information Version 2 (SMIv2)", STD 58, RFC 2578, April
1999.
Haberman, Worzella 10
Internet Draft MIB for MLD November 1999
[RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M., and S. Waldbusser, "Textual Conventions for
SMIv2", STD 58, RFC 2579, April 1999.
[RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M., and S. Waldbusser, "Conformance Statements for
SMIv2", STD 58, RFC 2580, April 1999.
[RFC1157] Case, J., Fedor, M., Schoffstall, M., and J. Davin,
"Simple Network Management Protocol", STD 15, RFC 1157,
May 1990.
[RFC1901] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
"Introduction to Community-based SNMPv2", RFC 1901,
January 1996.
[RFC1906] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
"Transport Mappings for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1906, January 1996.
[RFC2572] Case, J., Harrington D., Presuhn R., and B. Wijnen,
"Message Processing and Dispatching for the Simple Network
Management Protocol (SNMP)", RFC 2572, April 1999.
[RFC2574] Blumenthal, U., and B. Wijnen, "User-based Security Model
(USM) for version 3 of the Simple Network Management
Protocol (SNMPv3)", RFC 2574, April 1999.
[RFC1905] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
"Protocol Operations for Version 2 of the Simple Network
Management Protocol (SNMPv2)", RFC 1905, January 1996.
[RFC2573] Levi, D., Meyer, P., and B. Stewart, "SNMPv3
Applications", RFC 2573, April 1999.
[RFC2575] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based
Access Control Model (VACM) for the Simple Network
Management Protocol (SNMP)", RFC 2575, April 1999.
[RFC2570] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction to Version 3 of the Internet-standard
Network Management Framework", RFC 2570, April 1999.
Authors' Addresses
Brian Haberman
Nortel Networks
4309 Emperor Blvd.
Durham, NC 27703
USA
+1
haberman@nortelnetworks.com
-919-992-4439
Haberman, Worzella 11
Internet Draft MIB for MLD November 1999
Randy Worzella
IBM Corporation
800 Park Office Drive
Research Triangle Park, NC 27709
USA
+1
worzella@us.ibm.com
-919-254-2202
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 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.
Haberman, Worzella 12
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