IDMR Working Group Keith McCloghrie
INTERNET-DRAFT Dino Farinacci
Expires January 1998 cisco Systems
Dave Thaler
University of Michigan
18 July 1997
Internet Group Management Protocol MIB
<draft-ietf-idmr-igmp-mib-05.txt>
Status of this Memo
This document is an Internet Draft. 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 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 a "work in progress".
1. Introduction
This memo defines an experimental portion of the Management Information
Base (MIB) for use with network management protocols in the Internet
community. In particular, it describes managed objects used for
managing the Internet Group Management Protocol (IGMP). All of this MIB
module is applicable to IP multicast routers [6,7,8,9,10]; a subset is
applicable to hosts implementing IGMPv1 [5] or IGMPv2 [11].
Draft IGMP MIB July 1997
2. Revision History
A record of changes which will be removed before publication.
18 July 1997
(1) deprecated igmpInterfaceLeaves and added igmpInterfaceGroups to
replace it.
(2) deprecated igmpInterfaceQuerierPresentTimeout and added
igmpInterfaceRobustness to replace it since the former must be
derived from the latter per the IGMPv2 spec.
(3) replaced igmpBaseVersion2MIBGroup with igmpHostVersion2MIBGroup to
avoid requiring igmpInterfaceVersion1QuerierTimer at routers.
(4) deprecated igmpInterfaceLeaveEnabled
(5) added compliance statements for IGMPv2 hosts and routers
26 November 1996
(1) moved igmpInterfaceVersion1HostTimer to igmpCacheVersion1HostTimer.
(2) added igmpInterfaceVersion1QuerierTimer,
igmpInterfaceWrongVersionQueries, and igmpInterfaceJoins.
(3) added default value for igmpInterfaceQueryMaxResponseTime.
(4) moved igmpInterfaceVersion from igmpBaseVersion2MIBGroup to
igmpRouterVersion2MIBGroup.
9 June 1996
(1) added support for IGMP version 2.
3. The SNMP Network Management Framework
The SNMP Network Management Framework presently consists of three major
components. They are:
o RFC 1902 [1] which defines the SMI, the mechanisms used for
describing and naming objects for the purpose of management.
Expires January 1998 [Page 2]
Draft IGMP MIB July 1997
o STD 17, RFC 1213 [2] defines MIB-II, the core set of managed
objects for the Internet suite of protocols.
o RFC 1157 [3] and RFC 1905 [4] which define two versions of the
protocol used for network access to managed objects.
The Framework permits new objects to be defined for the purpose of
experimentation and evaluation.
3.1. Object Definitions
Managed objects are accessed via a virtual information store, termed the
Management Information Base or MIB. Objects in the MIB are defined
using the subset of Abstract Syntax Notation One (ASN.1) defined in the
SMI. In particular, each object type is named by an OBJECT IDENTIFIER,
an administratively assigned name. The object type together with an
object instance serves to uniquely identify a specific instantiation of
the object. For human convenience, we often use a textual string,
termed the descriptor, to refer to the object type.
Expires January 1998 [Page 3]
Draft IGMP MIB July 1997
4. Overview
This MIB module contains two tables:
(1) the IGMP Interface Table which contains one row for each interface
on which IGMP is enabled, and
(2) the IGMP Cache Table which contains one row for each IP multicast
group for which there are members on a particular interface.
Both tables are intended to be implemented by hosts and routers, but
some columnar objects in each table apply only to routers.
Expires January 1998 [Page 4]
Draft IGMP MIB July 1997
5. Definitions
IGMP-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, experimental, Counter32, Gauge32,
Integer32, IpAddress, TimeTicks FROM SNMPv2-SMI
RowStatus, TruthValue FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF;
igmpMIB MODULE-IDENTITY
LAST-UPDATED "9707181830Z"
ORGANIZATION "IETF IDMR Working Group."
CONTACT-INFO
" Keith McCloghrie
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
US
Phone: +1 408 526 5260
EMail: kzm@cisco.com"
DESCRIPTION
"The MIB module for IGMP Management."
::= { experimental 59 }
igmpMIBObjects OBJECT IDENTIFIER ::= { igmpMIB 1 }
igmp OBJECT IDENTIFIER ::= { igmpMIBObjects 1 }
Expires January 1998 [Page 5]
Draft IGMP MIB July 1997
--
-- The IGMP Interface Table
--
igmpInterfaceTable OBJECT-TYPE
SYNTAX SEQUENCE OF IgmpInterfaceEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The (conceptual) table listing the interfaces on which IGMP
is enabled."
::= { igmp 1 }
igmpInterfaceEntry OBJECT-TYPE
SYNTAX IgmpInterfaceEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry (conceptual row) representing an interface on
which IGMP is enabled."
INDEX { igmpInterfaceIfIndex }
::= { igmpInterfaceTable 1 }
IgmpInterfaceEntry ::= SEQUENCE {
igmpInterfaceIfIndex Integer32,
igmpInterfaceQueryInterval Integer32,
igmpInterfaceStatus RowStatus,
igmpInterfaceVersion INTEGER,
igmpInterfaceQuerier IpAddress,
igmpInterfaceQueryMaxResponseTime Integer32,
igmpInterfaceQuerierPresentTimeout Integer32, -- deprecated
igmpInterfaceLeaveEnabled TruthValue, -- deprecated
igmpInterfaceVersion1QuerierTimer Integer32,
igmpInterfaceWrongVersionQueries Counter32,
igmpInterfaceJoins Counter32,
igmpInterfaceLeaves Counter32, -- deprecated
igmpInterfaceGroups Gauge32,
igmpInterfaceRobustness Integer32
}
igmpInterfaceIfIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
Expires January 1998 [Page 6]
Draft IGMP MIB July 1997
"The interface for which IGMP is enabled."
::= { igmpInterfaceEntry 1 }
igmpInterfaceQueryInterval OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The frequency at which IGMP Host-Query packets are
transmitted on this interface."
DEFVAL { 125 }
::= { igmpInterfaceEntry 2 }
igmpInterfaceStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The activation of a row enables IGMP on the interface. The
destruction of a row disables IGMP on the interface."
::= { igmpInterfaceEntry 3 }
igmpInterfaceVersion OBJECT-TYPE
SYNTAX INTEGER { version1(1), version2(2) }
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The version of IGMP which is running on this interface.
This object can be used to configure a router capable of
running either value. For IGMP to function correctly, all
routers on a LAN must be configured to run the same version
of IGMP on that LAN."
DEFVAL { version2 }
::= { igmpInterfaceEntry 4 }
igmpInterfaceQuerier OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The address of the IGMP Querier on the IP subnet to which
this interface is attached."
::= { igmpInterfaceEntry 5 }
Expires January 1998 [Page 7]
Draft IGMP MIB July 1997
igmpInterfaceQueryMaxResponseTime OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The maximum query response time advertised in IGMPv2
queries on this interface."
DEFVAL { 10 }
::= { igmpInterfaceEntry 6 }
igmpInterfaceQuerierPresentTimeout OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"A timeout interval. If no IGMPv2 queries are heard on this
interface within this timeout interval, the local router
will take over the Querier on the IP subnet to which this
interface is attached. This object is now deprecated, since
its value can be derived from igmpInterfaceRobustness."
DEFVAL { 255 }
::= { igmpInterfaceEntry 7 }
igmpInterfaceLeaveEnabled OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"An indication of whether the processing of IGMPv2 Leave
messages is enabled on this interface. This object is now
deprecated since it must be true when igmpInterfaceVersion
is version2, and must be false when it is version1 to comply
with the IGMP specfication."
DEFVAL { true }
::= { igmpInterfaceEntry 8 }
igmpInterfaceVersion1QuerierTimer OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time remaining until the host assumes that there are no
Expires January 1998 [Page 8]
Draft IGMP MIB July 1997
IGMPv1 routers present on the interface. While this is
non-zero, the host will reply to all queries with version 1
membership reports."
::= { igmpInterfaceEntry 9 }
igmpInterfaceWrongVersionQueries OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of queries received whose IGMP version does not
match igmpInterfaceVersion. IGMP requires that all routers
on a LAN be configured to run the same version of IGMP.
Thus, if any queries are received with the wrong version,
this indicates a configuration error."
::= { igmpInterfaceEntry 10 }
igmpInterfaceJoins 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 IGMP activity
over time."
::= { igmpInterfaceEntry 11 }
igmpInterfaceLeaves OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The number of times a group membership has been removed
from this interface; that is, the number of times an entry
for this interface has been deleted from the Cache Table.
This object is deprecated since its value cannot be usefully
compared with igmpInterfaceJoins to get the number of groups
joined. Instead, igmpInterfaceGroups gives the number of
groups joined, which may be compared with igmpInterfaceJoins
to derive the number of leaves."
::= { igmpInterfaceEntry 12 }
igmpInterfaceGroups OBJECT-TYPE
Expires January 1998 [Page 9]
Draft IGMP MIB July 1997
SYNTAX Gauge32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The current number of entries for this interface in the
Cache Table."
::= { igmpInterfaceEntry 13 }
igmpInterfaceRobustness 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. IGMP is
robust to (Robustness Variable-1) packet losses."
DEFVAL { 2 }
::= { igmpInterfaceEntry 14 }
--
-- The IGMP Cache Table
--
igmpCacheTable OBJECT-TYPE
SYNTAX SEQUENCE OF IgmpCacheEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The (conceptual) table listing the IP multicast groups for
which there are members on a particular interface."
::= { igmp 2 }
igmpCacheEntry OBJECT-TYPE
SYNTAX IgmpCacheEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry (conceptual row) in the igmpCacheTable."
INDEX { igmpCacheAddress, igmpCacheIfIndex }
::= { igmpCacheTable 1 }
Expires January 1998 [Page 10]
Draft IGMP MIB July 1997
IgmpCacheEntry ::= SEQUENCE {
igmpCacheAddress IpAddress,
igmpCacheIfIndex Integer32,
igmpCacheSelf TruthValue,
igmpCacheLastReporter IpAddress,
igmpCacheUpTime TimeTicks,
igmpCacheExpiryTime TimeTicks,
igmpCacheStatus RowStatus,
igmpCacheVersion1HostTimer Integer32
}
igmpCacheAddress OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The IP multicast group address for which this entry
contains information."
::= { igmpCacheEntry 1 }
igmpCacheIfIndex OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The interface for which this entry contains information for
an IP multicast group address."
::= { igmpCacheEntry 2 }
igmpCacheSelf 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 }
::= { igmpCacheEntry 3 }
igmpCacheLastReporter OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The IP address of the source of the last membership report
Expires January 1998 [Page 11]
Draft IGMP MIB July 1997
received for this IP Multicast group address on this
interface. If no membership report has been received, this
object has the value 0.0.0.0."
::= { igmpCacheEntry 4 }
igmpCacheUpTime 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."
::= { igmpCacheEntry 5 }
igmpCacheExpiryTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The minimum amount of time remaining before this entry will
be aged out."
::= { igmpCacheEntry 6 }
igmpCacheStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this entry."
::= { igmpCacheEntry 7 }
igmpCacheVersion1HostTimer OBJECT-TYPE
SYNTAX Integer32
UNITS "seconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time remaining until the local router will assume that
there are no longer any IGMP version 1 members on the IP
subnet attached to this interface. Upon hearing any IGMPv1
Membership Report, this value is reset to the group
membership timer. While this time remaining is non-zero,
the local router ignores any IGMPv2 Leave messages for this
group that it receives on this interface."
::= { igmpCacheEntry 8 }
Expires January 1998 [Page 12]
Draft IGMP MIB July 1997
-- conformance information
igmpMIBConformance
OBJECT IDENTIFIER ::= { igmpMIB 2 }
igmpMIBCompliances
OBJECT IDENTIFIER ::= { igmpMIBConformance 1 }
igmpMIBGroups OBJECT IDENTIFIER ::= { igmpMIBConformance 2 }
-- compliance statements
igmpV1HostMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for hosts running IGMPv1 and
implementing the IGMP MIB."
MODULE -- this module
MANDATORY-GROUPS { igmpBaseMIBGroup }
OBJECT igmpInterfaceStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { igmpMIBCompliances 1 }
igmpV1RouterMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for routers running IGMPv1 and
implementing the IGMP MIB."
MODULE -- this module
MANDATORY-GROUPS { igmpBaseMIBGroup,
igmpRouterMIBGroup
}
OBJECT igmpInterfaceStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { igmpMIBCompliances 2 }
igmpV2HostMIBCompliance MODULE-COMPLIANCE
STATUS current
Expires January 1998 [Page 13]
Draft IGMP MIB July 1997
DESCRIPTION
"The compliance statement for hosts running IGMPv2 and
implementing the IGMP MIB."
MODULE -- this module
MANDATORY-GROUPS { igmpBaseMIBGroup,
igmpV2HostMIBGroup
}
OBJECT igmpInterfaceStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { igmpMIBCompliances 3 }
igmpV2RouterMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for routers running IGMPv2 and
implementing the IGMP MIB."
MODULE -- this module
MANDATORY-GROUPS { igmpBaseMIBGroup,
igmpRouterMIBGroup,
igmpV2RouterMIBGroup
}
OBJECT igmpInterfaceStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { igmpMIBCompliances 4 }
-- units of conformance
igmpBaseMIBGroup OBJECT-GROUP
OBJECTS { igmpCacheSelf, igmpCacheLastReporter,
igmpCacheStatus, igmpInterfaceStatus
}
STATUS current
DESCRIPTION
"The basic collection of objects providing management of
IGMP version 1 or 2."
::= { igmpMIBGroups 1 }
Expires January 1998 [Page 14]
Draft IGMP MIB July 1997
igmpRouterMIBGroup OBJECT-GROUP
OBJECTS { igmpCacheUpTime, igmpCacheExpiryTime,
igmpInterfaceQueryInterval
}
STATUS current
DESCRIPTION
"A collection of additional objects for management of IGMP
version 1 or 2 in routers."
::= { igmpMIBGroups 2 }
igmpV2HostMIBGroup OBJECT-GROUP
OBJECTS { igmpInterfaceQuerier,
igmpInterfaceVersion1QuerierTimer
}
STATUS current
DESCRIPTION
"A collection of additional objects for management of IGMP
version 2 in hosts."
::= { igmpMIBGroups 3 }
igmpRouterVersion2MIBGroup OBJECT-GROUP
OBJECTS { igmpInterfaceVersion,
igmpInterfaceQueryMaxResponseTime,
igmpInterfaceQuerierPresentTimeout,
igmpInterfaceLeaveEnabled,
igmpInterfaceWrongVersionQueries,
igmpInterfaceJoins,
igmpInterfaceLeaves,
igmpCacheVersion1HostTimer
}
STATUS deprecated
DESCRIPTION
"A collection of additional objects for management of IGMP
version 2 in routers. This group has been obsoleted by
igmpV2RouterMIBGroup."
::= { igmpMIBGroups 4 }
igmpV2RouterMIBGroup OBJECT-GROUP
OBJECTS { igmpInterfaceVersion, igmpInterfaceQuerier,
igmpInterfaceQueryMaxResponseTime,
igmpInterfaceRobustness,
igmpInterfaceWrongVersionQueries,
igmpInterfaceJoins, igmpInterfaceGroups,
igmpCacheVersion1HostTimer
Expires January 1998 [Page 15]
Draft IGMP MIB July 1997
}
STATUS current
DESCRIPTION
"A collection of additional objects for management of IGMP
version 2 in routers."
::= { igmpMIBGroups 5 }
END
Expires January 1998 [Page 16]
Draft IGMP MIB July 1997
6. References
[1] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Structure of Management Information for version 2
of the Simple Network Management Protocol (SNMPv2)", RFC 1902,
January 1996.
[2] McCloghrie, K., and M. Rose, Editors, "Management Information Base
for Network Management of TCP/IP-based internets: MIB-II", STD 17,
RFC 1213, March 1991.
[3] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple Network
Management Protocol", RFC 1157, May 1990.
[4] SNMPv2 Working Group, 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.
[5] Deering, S., "Host Extensions for IP Multicasting", RFC 1112,
Stanford University, August 1989.
[6] Waitzman, D., Partridge, C., and S.E. Deering, "Distance Vector
Multicast Routing Protocol", RFC 1075, Bolt Beranek and Newman,
Stanford University, November 1988.
[7] Estrin, D., Farinacci, D., Helmy, A., Thaler, D., Deering, S.,
Handley, M., Jacobson, V., Liu, C., and P. Sharma, "Protocol
Independent Multicast - Sparse Mode (PIM-SM): Protocol
Specification", RFC 2117, June 1997.
[8] Estrin, D., Farinacci, D., Jacobson, V., Liu, C., Wei, L., Sharma,
P, and Helmy, A., "Protocol Independent Multicast-Dense Mode (PIM-
DM): Protocol Specification", January 1996.
[9] Moy, J., "Multicast Extensions to OSPF", RFC 1584, Proteon, March
1994.
[10] Ballardie, A. J., "Core Based Trees (CBT) Multicast: Architectural
Overview and Specification", University College London, November
1994.
[11] Fenner, W., "Internet Group Management Protocol, Version 2",
Working Draft, draft-ietf-idmr-igmp-v2-06.txt, January 1997.
Expires January 1998 [Page 17]
Draft IGMP MIB July 1997
7. Security Considerations
Security issues are not discussed in this memo.
8. Author's Address
Keith McCloghrie
cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
Phone: +1 408 526 5260
EMail: kzm@cisco.com
Dino Farinacci
cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
Phone: +1 408 526 4696
EMail: dino@cisco.com
Dave Thaler
Department of Electrical Engineering and Computer Science
University of Michigan
1301 Beal Ave.
Ann Arbor, MI 48109-2122
Phone: +1 313 763 5243
EMail: thalerd@eecs.umich.edu
Expires January 1998 [Page 18]
Draft IGMP MIB July 1997
Table of Contents
1 Introduction .................................................... 1
2 Revision History ................................................ 2
3 The SNMP Network Management Framework ........................... 2
3.1 Object Definitions ............................................ 3
4 Overview ........................................................ 4
5 Definitions ..................................................... 5
6 References ...................................................... 17
7 Security Considerations ......................................... 18
8 Author's Address ................................................ 18
Expires January 1998 [Page 19]
