J. Chesterfield,
Draft Editor
Internet Draft AT&T Labs - Research
Document:
draft-ietf-magma-rfc2933-update-00.txt
Expires: December 2002 June 2002
Internet Group Management Protocol MIB
Status of this Memo
This document is an Internet-Draft and is in full conformance
with all provisions of Section 10 of RFC2026.
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Abstract
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes objects used for managing the Internet
Group Management Protocol (IGMP).
Table of Contents
1. Introduction....................................................2
2. The SNMP Management Framework...................................2
3. Overview........................................................3
4. Definitions.....................................................3
5. Security Considerations........................................17
6. Contributors...................................................17
7. Acknowledgements...............................................18
8. Author's Addresses.............................................18
9. References.....................................................18
10. Full Copyright Statement......................................19
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Internet Group Management Protocol MIB
1. Introduction
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes objects used for managing the Internet
Group Management Protocol (IGMP), version 1 [17], version 2 [18] or
version 3 [19]. This version of the MIB is an update to rfc2933
incorporating IGMPv3 changes to enable "source filtering" in routers
and hosts. All of this MIB module is applicable to IPv4 multicast
routers; a subset is applicable to hosts implementing IGMP. Since
IGMP is specific to IPv4, this MIB does not support management of
equivalent functionality for other address families, such as IPv6.
Such management may be supported by other MIBs.
2. The SNMP Management Framework
The SNMP Management Framework presently consists of five major
components:
. An overall architecture, described in RFC 2571 [RFC2571].
. 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 [1], STD 16, RFC 1212 [3] and RFC 1215 [4].
The second version, called SMIv2, is described in STD 58, RFC
2578 [5], STD 58, RFC 2579 [6] and STD 58, RFC 2580 [7].
. Message protocols for transferring management information. The
first version of the SNMP message protocol is called SNMPv1 and
described in STD 15, RFC 1157 [8]. A second version of the
SNMP message protocol, which is not an Internet standards track
protocol, is called SNMPv2c and described in RFC 1901 [9] and
RFC 1906 [10]. The third version of the message protocol is
called SNMPv3 and described in RFC 1906 [10], RFC 2572 [11] and
RFC 2574 [12].
. Protocol operations for accessing management information. The
first set of protocol operations and associated PDU formats is
described in STD 15, RFC 1157 [8]. A second set of protocol
operations and associated PDU formats is described in RFC 1905
[13].
. A set of fundamental applications described in RFC 2573 [14]
and the view-based access control mechanism described in RFC
2575 [15].
A more detailed introduction to the current SNMP Management
Framework can be found in RFC 2570 [16].
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 three tables:
1. the IGMP Interface Table which contains one row for each
interface on which IGMP is enabled,
2. the IGMP Cache Table which contains one row for each IP
multicast group for which there are members on a particular
interface, and
3. the IGMP SrcList Table which contains one row for each entry in
the source filter record for an interface and multicast group
pair.
All tables are intended to be implemented by hosts and routers, but
some columnar objects in the first and second tables apply only to
routers.
4. Definitions
IGMP-STD-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, mib-2, Counter32, Gauge32,
Unsigned32, IpAddress, TimeTicks FROM SNMPv2-SMI
RowStatus, TruthValue FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF
InterfaceIndexOrZero,
InterfaceIndex FROM IF-MIB;
igmpStdMIB MODULE-IDENTITY
LAST-UPDATED "200206140000Z" -- June 14, 2002
ORGANIZATION "IETF MAGMA Working Group."
CONTACT-INFO
" Dave Thaler
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052-6399
US
Phone: +1 425 703 8835
EMail: dthaler@microsoft.com
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Julian Chesterfield
AT&T Research-Labs
75 Willow Road
Menlo Park, CA 94025
US
Phone: +1 650 330 7762
EMail: julian@research.att.com"
DESCRIPTION
"The MIB module for IGMP Management."
REVISION "200009280000Z" -- September 28, 2000
DESCRIPTION
"Initial version, published as RFC 2933.?
REVISION "200206140000Z" -- June 14, 2002
DESCRIPTION
"RFC 2933 revised 6/02 to incorporate IGMPv3 changes."
::= { mib-2 85 }
igmpMIBObjects OBJECT IDENTIFIER ::= { igmpStdMIB 1 }
--
-- 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."
::= { igmpMIBObjects 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 InterfaceIndex,
igmpInterfaceQueryInterval Unsigned32,
igmpInterfaceStatus RowStatus,
igmpInterfaceVersion Unsigned32,
igmpInterfaceQuerier IpAddress,
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igmpInterfaceQueryMaxResponseTime Unsigned32,
igmpInterfaceQuerierUpTime TimeTicks,
igmpInterfaceQuerierExpiryTime TimeTicks,
igmpInterfaceVersion1QuerierTimer TimeTicks,
igmpInterfaceWrongVersionQueries Counter32,
igmpInterfaceJoins Counter32,
igmpInterfaceProxyIfIndex InterfaceIndexOrZero,
igmpInterfaceGroups Gauge32,
igmpInterfaceRobustness Unsigned32,
igmpInterfaceLastMembQueryIntvl Unsigned32,
igmpInterfaceVersion2QuerierTimer TimeTicks
}
igmpInterfaceIfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The ifIndex value of the interface for which IGMP is
enabled."
::= { igmpInterfaceEntry 1 }
igmpInterfaceQueryInterval OBJECT-TYPE
SYNTAX Unsigned32
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 Unsigned32
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 { 2 }
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::= { 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 }
igmpInterfaceQueryMaxResponseTime OBJECT-TYPE
SYNTAX Unsigned32 (0..255)
UNITS "tenths of seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The maximum query response time advertised in IGMPv2
queries on this interface."
DEFVAL { 100 }
::= { igmpInterfaceEntry 6 }
igmpInterfaceQuerierUpTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time since igmpInterfaceQuerier was last changed."
::= { igmpInterfaceEntry 7 }
igmpInterfaceQuerierExpiryTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The amount of time remaining before the Other Querier
Present Timer expires. If the local system is the querier,
the value of this object is zero."
::= { igmpInterfaceEntry 8 }
igmpInterfaceVersion1QuerierTimer OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time remaining until the host assumes that there are no
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
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STATUS current
DESCRIPTION
"The number of queries received whose IGMP version does not
match igmpInterfaceVersion, over the lifetime of the row
entry. 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 the lifetime of the row entry."
::= { igmpInterfaceEntry 11 }
igmpInterfaceProxyIfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Some devices implement a form of IGMP proxying whereby
memberships learned on the interface represented by this
row, cause IGMP Host Membership Reports to be sent on the
interface whose ifIndex value is given by this object. Such
a device would implement the igmpV2RouterMIBGroup only on
its router interfaces (those interfaces with non-zero
igmpInterfaceProxyIfIndex). Typically, the value of this
object is 0, indicating that no proxying is being done."
DEFVAL { 0 }
::= { igmpInterfaceEntry 12 }
igmpInterfaceGroups OBJECT-TYPE
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 Unsigned32 (1..255)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
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"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 }
igmpInterfaceLastMembQueryIntvl OBJECT-TYPE
SYNTAX Unsigned32 (0..255)
UNITS "tenths of seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The Last Member Query Interval is the Max Response Time
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
member of a group. The value of this object is irrelevant
if igmpInterfaceVersion is 1."
DEFVAL { 10 }
::= { igmpInterfaceEntry 15 }
igmpInterfaceVersion2QuerierTimer OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time remaining until the host assumes that there are no
IGMPv2 routers present on the interface. While this is non-
zero, the host will reply to all queries with version 1 or 2
membership reports."
::= { igmpInterfaceEntry 16 }
--
-- 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."
::= { igmpMIBObjects 2 }
igmpCacheEntry OBJECT-TYPE
SYNTAX IgmpCacheEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry (conceptual row) in the igmpCacheTable."
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INDEX { igmpCacheAddress, igmpCacheIfIndex }
::= { igmpCacheTable 1 }
IgmpCacheEntry ::= SEQUENCE {
igmpCacheAddress IpAddress,
igmpCacheIfIndex InterfaceIndex,
igmpCacheSelf TruthValue,
igmpCacheLastReporter IpAddress,
igmpCacheUpTime TimeTicks,
igmpCacheExpiryTime TimeTicks,
igmpCacheStatus RowStatus,
igmpCacheVersion1HostTimer TimeTicks,
igmpCacheVersion2HostTimer TimeTicks,
igmpCacheSourceFilterMode 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 InterfaceIndex
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
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."
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::= { igmpCacheEntry 4 }
igmpCacheUpTime OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time elapsed since this entry was created."
::= { 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. A value of 0 indicates that the entry is only
present because igmpCacheSelf 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."
::= { 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 TimeTicks
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 }
igmpCacheVersion2HostTimer OBJECT-TYPE
SYNTAX TimeTicks
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The time remaining until the local router will assume that
there are no longer any IGMP version 2 members on the IP
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subnet attached to this interface. Upon hearing any IGMPv2
Membership Report, this value is reset to the group
membership timer."
::= { igmpCacheEntry 9 }
igmpCacheSourceFilterMode OBJECT-TYPE
SYNTAX Integer32 {include (1),
exclude (2) }
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The state in which the interface is currently set. The
value indicates the relevance of the corresponding source
list entries in the SrcList Table for IGMPv3 interfaces."
::= { igmpCacheEntry 10 }
--
-- The IGMP Source list Table
--
igmpSrcListTable OBJECT-TYPE
SYNTAX SEQUENCE OF IgmpSrcListEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The (conceptual) table listing the Source List entries
corresponding to each Interface filter mode record."
::= { igmpMIBObjects 3 }
igmpSrcListEntry OBJECT-TYPE
SYNTAX IgmpSrcListEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry (conceptual row) in the igmpSrcListTable."
INDEX { igmpSrcListAddress, igmpSrcListIfIndex,
igmpSrcListHostAddress }
::= { igmpSrcListTable 1 }
IgmpSrcListEntry ::= SEQUENCE {
igmpSrcListAddress IpAddress,
igmpSrcListIfIndex InterfaceIndex,
igmpSrcListHostAddress IpAddress,
igmpSrcListStatus RowStatus
}
igmpSrcListAddress OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS not-accessible
STATUS current
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DESCRIPTION
"The IP multicast group address for which this entry
contains information."
::= { igmpSrcListEntry 1 }
igmpSrcListIfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The interface for which this entry contains information for
an IP multicast group address."
::= { igmpSrcListEntry 2 }
igmpSrcListHostAddress OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The host address to which this entry
corresponds. The CacheSourceFilterMode value for this Group
address and interface indicates whether this Host address
is included or excluded."
::= { igmpSrcListEntry 3 }
igmpSrcListStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The status of this entry."
::= { igmpSrcListEntry 4 }
-- conformance information
igmpMIBConformance
OBJECT IDENTIFIER ::= { igmpStdMIB 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
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MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT igmpCacheStatus
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."
OBJECT igmpCacheStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { igmpMIBCompliances 2 }
igmpV2HostMIBCompliance MODULE-COMPLIANCE
STATUS current
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."
OBJECT igmpCacheStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { igmpMIBCompliances 3 }
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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."
OBJECT igmpCacheStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { igmpMIBCompliances 4 }
igmpV3HostMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for hosts running IGMPv3 and
implementing the IGMP MIB."
MODULE -- this module
MANDATORY-GROUPS { igmpBaseMIBGroup,
igmpV2HostMIBGroup,
igmpV3HostMIBGroup
}
OBJECT igmpInterfaceStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT igmpCacheStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { igmpMIBCompliances 5 }
igmpV3RouterMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for routers running IGMPv3 and
implementing the IGMP MIB."
MODULE -- this module
MANDATORY-GROUPS { igmpBaseMIBGroup,
igmpRouterMIBGroup,
igmpV2RouterMIBGroup,
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igmpV3RouterMIBGroup
}
OBJECT igmpInterfaceStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
OBJECT igmpCacheStatus
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."
::= { igmpMIBCompliances 6 }
-- units of conformance
igmpBaseMIBGroup OBJECT-GROUP
OBJECTS { igmpCacheSelf,
igmpCacheStatus, igmpInterfaceStatus
}
STATUS current
DESCRIPTION
"The basic collection of objects providing management of
IGMP version 1, 2 or 3."
::= { igmpMIBGroups 1 }
igmpRouterMIBGroup OBJECT-GROUP
OBJECTS { igmpCacheUpTime, igmpCacheExpiryTime,
igmpInterfaceJoins, igmpInterfaceGroups,
igmpCacheLastReporter, igmpInterfaceQuerierUpTime,
igmpInterfaceQuerierExpiryTime,
igmpInterfaceQueryInterval
}
STATUS current
DESCRIPTION
"A collection of additional objects for management of IGMP
version 1, 2 or 3 in routers."
::= { igmpMIBGroups 2 }
igmpV2HostMIBGroup OBJECT-GROUP
OBJECTS { igmpInterfaceVersion1QuerierTimer }
STATUS current
DESCRIPTION
"A collection of additional objects for management of IGMP
version 2 in hosts."
::= { igmpMIBGroups 3 }
igmpHostOptMIBGroup OBJECT-GROUP
OBJECTS { igmpCacheLastReporter, igmpInterfaceQuerier }
STATUS current
DESCRIPTION
"A collection of optional objects for IGMP hosts.
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Supporting this group can be especially useful in an
environment with a router which does not support the IGMP
MIB."
::= { igmpMIBGroups 4 }
igmpV2RouterMIBGroup OBJECT-GROUP
OBJECTS { igmpInterfaceVersion, igmpInterfaceQuerier,
igmpInterfaceQueryMaxResponseTime,
igmpInterfaceRobustness,
igmpInterfaceWrongVersionQueries,
igmpInterfaceLastMembQueryIntvl,
igmpCacheVersion1HostTimer
}
STATUS current
DESCRIPTION
"A collection of additional objects for management of IGMP
version 2 in routers."
::= { igmpMIBGroups 5 }
igmpV2ProxyMIBGroup OBJECT-GROUP
OBJECTS { igmpInterfaceProxyIfIndex }
STATUS current
DESCRIPTION
"A collection of additional objects for management of IGMP
proxy devices."
::= { igmpMIBGroups 6 }
igmpV3HostMIBGroup OBJECT-GROUP
OBJECTS { igmpCacheSourceFilterMode,
igmpInterfaceVersion2QuerierTimer,
igmpSrcListAddress,
igmpSrcListIfIndex,
igmpSrcListHostAddress
}
STATUS current
DESCRIPTION
"A collection of additional objects for management of IGMP
version 3 in hosts."
::= { igmpMIBGroups 7 }
igmpV3RouterMIBGroup OBJECT-GROUP
OBJECTS { igmpCacheSourceFilterMode,
igmpCacheVersion2HostTimer,
igmpSrcListAddress,
igmpSrcListIfIndex,
igmpSrcListHostAddress
}
STATUS current
DESCRIPTION
"A collection of additional objects for management of IGMP
version 3 in routers."
::= { igmpMIBGroups 8 }
END
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5. Security Considerations
This MIB contains readable objects whose values provide information
related to multicast sessions. Some of these objects could contain
sensitive information. In particular, the igmpCacheSelf and
igmpCacheLastReporter can be used to identify machines which are
listening to a given group address. There are also a number of
objects that have a MAX-ACCESS clause of read-write and/or read-
create, which allow an administrator to configure IGMP in the
router.
While unauthorized access to the readable objects is relatively
innocuous, unauthorized access to the write-able objects could cause
a denial of service. Hence, the support for SET operations in a
non-secure environment without proper protection can have a negative
effect on network operations.
SNMPv1 by itself is such an insecure 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 SET (change/create/delete) the objects in this MIB.
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 [12] and the View-based
Access Control Model RFC 2575 [15] is recommended.
It is then a customer/user responsibility to ensure that the SNMP
entity giving access to this MIB, is properly configured to give
access to those objects only to those principals (users) that have
legitimate rights to access them.
6. Contributors
The authors of RFC 2933 from which this document is derived are:
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
Procket Networks
3850 North First Street
San Jose, CA 95134
Phone: +1 408-954-7909
Email: dino@procket.com
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Dave Thaler
Microsoft Corporation
One Microsoft Way
Redmond, WA 48105-6399
Phone: +1 425 703 8835
EMail: dthaler@microsoft.com
7. Acknowledgements
Thanks to Bill Fenner for feedback and suggestions regarding the MIB.
8. Author's Address
Julian Chesterfield
AT&T Labs - Research
75 Willow Road
Menlo Park
CA, 94301
9. References
[1] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for
Describing SNMP Management Frameworks", RFC 2571, April 1999.
[2] Rose, M., and K. McCloghrie, "Structure and Identification of
Management Information for TCP/IP-based Internets", STD 16, RFC
1155, May 1990.
[3] Rose, M., and K. McCloghrie, "Concise MIB Definitions", STD 16,
RFC 1212, March 1991.
[4] M. Rose, "A Convention for Defining Traps for use with the
SNMP", RFC 1215, March 1991.
[5] 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.
[6] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
M., and S. Waldbusser, "Textual Conventions for SMIv2", STD 58,
RFC 2579, April 1999.
[7] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
M., and S. Waldbusser, "Conformance Statements for SMIv2", STD
58, RFC 2580, April 1999.
[8] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple
Network Management Protocol", STD 15, RFC 1157, May 1990.
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[9] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
"Introduction to Community-based SNMPv2", RFC 1901, January
1996.
[10] 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.
[11] Case, J., Harrington D., Presuhn R., and B. Wijnen, "Message
Processing and Dispatching for the Simple Network Management
Protocol (SNMP)", RFC 2572, April 1999.
[12] Blumenthal, U., and B. Wijnen, "User-based Security Model (USM)
for version 3 of the Simple Network Management Protocol
(SNMPv3)", RFC 2574, April 1999.
[13] 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.
[14] Levi, D., Meyer, P., and B. Stewart, "SNMPv3 Applications", RFC
2573, April 1999.
[15] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access
Control Model (VACM) for the Simple Network Management Protocol
(SNMP)", RFC 2575, April 1999.
[16] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction
to Version 3 of the Internet-standard Network Management
Framework", RFC 2570, April 1999.
[17] Deering, S., "Host Extensions for IP Multicasting", STD 5, RFC
1112, August 1989.
[18] Fenner, W., "Internet Group Management Protocol, Version 2", RFC
2236, November 1997.
[19] Cain, B., Deering, S., Fenner, W., Kouvelas, I., Thyagarajan,
A., ?Internet Group Management Protocol, Version 3?, <draft-
ietf-idmr-igmp>, May 2002.
10. Full Copyright Statement
Copyright (C) The Internet Society (2000). 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
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Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet 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."
