AT-IGMP-MIB

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Organization: Allied Telesis, Inc.

Last Updated: 2007-08-08

Category: VLAN and Bridging, Vendor: Allied Telesis

Description: Manages IGMP snooping and proxy configuration, group membership tables, and multicast forwarding on Allied Telesis switches.

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What Is AT-IGMP-MIB?

AT-IGMP-MIB is Allied Telesis's private MIB for managing IGMP (Internet Group Management Protocol) snooping and proxy functionality on their switches. It exposes interface-level configuration such as query timeout and proxy mode, along with statistics tables tracking IGMP protocol message counts (queries, v1/v2 reports, leaves) per interface. Its monitoring value centers on software/protocol-state visibility rather than hardware sensors - administrators use it to confirm multicast group membership behavior and diagnose issues like excessive IGMP leave/join churn or snooping misconfiguration causing multicast flooding. It builds on the standard IGMP protocol concepts but is an Allied Telesis enterprise extension rather than a direct implementation of a published IETF IGMP MIB. It is deployed in Layer 2/Layer 3 network environments running IPTV or other multicast applications over Allied Telesis switches, and administrators who want to inspect these objects directly can download the AT-IGMP-MIB file to load into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in AT-IGMP-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Allied Telesis switch/router

Monitoring Examples

An administrator would poll igmpIntStatsTable/igmpIntStatsEntry to check igmpInQuery, igmpInReportV1, igmpInReportV2, and igmpInLeave counts on a per-interface basis via igmpInterfaceTable/igmpInterfaceEntry. A sudden spike in igmpInLeave events or a stalled igmpInQuery count would indicate multicast group churn or a failed IGMP querier, both of which can disrupt multicast video/IPTV delivery. Checking igmpQueryTimeout and igmpSnooping settings alongside these counters helps confirm whether the observed behavior stems from misconfiguration rather than a network fault.

What Can Be Monitored

IGMP query timeout setting
IGMP proxy mode status
IGMP query message count
IGMPv1/v2 report counts
IGMP leave message count
per-interface multicast group membership

Imported Objects

From AT-SMI-MIB

modules

OBJECT-IDENTITY

From IF-MIB

InterfaceIndex

From SNMPv2-SMI

IpAddress
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

DisplayString
MacAddress
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
igmp	1.3.6.1.4.1.207.8.4.4.4.139			The MIB module for IGMP Management.
igmpIntInfo	1.3.6.1.4.1.207.8.4.4.4.139.1
igmpInterfaceTable	1.3.6.1.4.1.207.8.4.4.4.139.1.1		not-accessible	The (conceptual) table listing IGMP capable IP interfaces.
igmpInterfaceEntry	1.3.6.1.4.1.207.8.4.4.4.139.1.1.1		not-accessible	An entry (conceptual row) in the igmpInterfaceTable.
INT igmpInterface	1.3.6.1.4.1.207.8.4.4.4.139.1.1.1.1	INTEGER	read-only	The index value of the interface for which IGMP is enabled. This table is indexed by this value.
STR igmpInterfaceName	1.3.6.1.4.1.207.8.4.4.4.139.1.1.1.2	DisplayString	read-only	The name of the interface for which IGMP or MLD is enabled.
U32 igmpQueryTimeout	1.3.6.1.4.1.207.8.4.4.4.139.1.1.1.3	Unsigned32	read-only	It represents the maximum expected time interval, in seconds, between successive IGMP general query messages arriving on the interface. A vlaue of zero means there is no limits.
INT igmpProxy	1.3.6.1.4.1.207.8.4.4.4.139.1.1.1.4	INTEGER	read-only	The object represents states of igmp proxy. When it has a value of 0 then it means the inteface proxy is currently disabled. When it has a value of 1 then it means IGMP is performing upstream inteface proxying. When it has a value of 2 then it means IGMP is performing downstream inteface proxying.
igmpIntStatsTable	1.3.6.1.4.1.207.8.4.4.4.139.1.2		not-accessible	The (conceptual) table listing statistics for IGMP capable IP interfaces.
igmpIntStatsEntry	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1		not-accessible	An entry (conceptual row) in the igmpIntStatsTable.
U32 igmpInQuery	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.1	Unsigned32	read-only	The number of IGMP Query messages received by the interface.
U32 igmpInReportV1	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.2	Unsigned32	read-only	The number of IGMP version 1 Report messages received by the interface.
U32 igmpInReportV2	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.3	Unsigned32	read-only	The number of IGMP version 2 Report messages received by the interface.
U32 igmpInLeave	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.4	Unsigned32	read-only	The number of IGMP Leave Group messages received by the interface.
U32 igmpInTotal	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.5	Unsigned32	read-only	The total number of IGMP messages received by the interface.
U32 igmpOutQuery	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.6	Unsigned32	read-only	The total number of IGMP Query messages that were transmitted by the switch over the interface.
U32 igmpOutTotal	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.7	Unsigned32	read-only	The total number of IGMP messages that were transmitted by the switch over the interface.
U32 igmpBadQuery	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.8	Unsigned32	read-only	The number of IGMP membership query messages with errors that were received by the interface.
U32 igmpBadReportV1	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.9	Unsigned32	read-only	The number of IGMP Version 1 membership report messages with errors that were received by the interface.
U32 igmpBadReportV2	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.10	Unsigned32	read-only	The number of IGMP Version 2 membership report messages with errors that were received by the interface.
U32 igmpBadLeave	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.11	Unsigned32	read-only	The number of IGMP Leave Group messages with errors that were received by the interface.
U32 igmpBadTotal	1.3.6.1.4.1.207.8.4.4.4.139.1.2.1.12	Unsigned32	read-only	The total number of IGMP messages with errors that were received by the interface..
igmpIntMember	1.3.6.1.4.1.207.8.4.4.4.139.9
igmpIntGroupTable	1.3.6.1.4.1.207.8.4.4.4.139.9.1		not-accessible	The (conceptual) table listing the IP multicast groups of which there are members on a particular interface.
igmpIntGroupEntry	1.3.6.1.4.1.207.8.4.4.4.139.9.1.1		not-accessible	An entry (conceptual row) in the igmpGroupTable.
IP igmpIntGroupAddress	1.3.6.1.4.1.207.8.4.4.4.139.9.1.1.1	IpAddress	read-only	The IP multicast group address for which this entry contains information.
IP igmpLastHost	1.3.6.1.4.1.207.8.4.4.4.139.9.1.1.2	IpAddress	read-only	The IP address of the last host reporting a membership. If it is static, then 0.0.0.0 presents.
U32 igmpRefreshTime	1.3.6.1.4.1.207.8.4.4.4.139.9.1.1.3	Unsigned32	read-only	The time in seconds until the membership group is deleted if another membership report is not received. A value of 0xffffffff means infinity.
igmpSnooping	1.3.6.1.4.1.207.8.4.4.4.139.10
igmpSnoopAdminInfo	1.3.6.1.4.1.207.8.4.4.4.139.10.1
T/F igmpSnoopAdminEnabled	1.3.6.1.4.1.207.8.4.4.4.139.10.1.1	TruthValue	read-only	Indicates whether IGMP Snooping is globally enabled.
igmpSnoopVlanTable	1.3.6.1.4.1.207.8.4.4.4.139.10.2		not-accessible	The (conceptual) table listing the layer 2 interfaces performing IGMP snooping.
igmpSnoopVlanEntry	1.3.6.1.4.1.207.8.4.4.4.139.10.2.1		not-accessible	An entry (conceptual row) in the IGMP Snooping Vlan Table.
INT igmpSnoopVID	1.3.6.1.4.1.207.8.4.4.4.139.10.2.1.1	INTEGER	read-only	The 802.1 VLAN ID of the layer 2 interface performing IGMP snooping.
STR igmpSnoopVlanName	1.3.6.1.4.1.207.8.4.4.4.139.10.2.1.2	DisplayString	read-only	The name of the layer 2 interface performing IGMP snooping.
INT igmpSnoopFastLeave	1.3.6.1.4.1.207.8.4.4.4.139.10.2.1.3	INTEGER	read-only	Indicates whether FastLeave is enabled, and operating in Single-Host or Multi-Host mode.
T/F igmpSnoopQuerySolicit	1.3.6.1.4.1.207.8.4.4.4.139.10.2.1.4	TruthValue	read-only	Indicates whether query solicitation is on
STR igmpSnoopStaticRouterPorts	1.3.6.1.4.1.207.8.4.4.4.139.10.2.1.5	DisplayString	read-only	Indicates the configured static multicast router ports.
igmpSnoopGroupTable	1.3.6.1.4.1.207.8.4.4.4.139.10.3		not-accessible	The (conceptual) table of IGMP Groups snooped on a layer 2 interface.
igmpSnoopGroupEntry	1.3.6.1.4.1.207.8.4.4.4.139.10.3.1		not-accessible	A (conceptual) row in the IGMP Snooping Group table.
IP igmpSnoopGroupAddress	1.3.6.1.4.1.207.8.4.4.4.139.10.3.1.1	IpAddress	read-only	The Multicast Group IP Address detected on a layer 2 interface.
U32 igmpSnoopGroupTimer	1.3.6.1.4.1.207.8.4.4.4.139.10.3.1.2	Unsigned32	read-only	The time remaining before the multicast group is deleted from the layer 2 interface.
igmpSnoopPortTable	1.3.6.1.4.1.207.8.4.4.4.139.10.4		not-accessible	A (conceptual) table of ports in a layer 2 interface that are currently members of a multicast group.
igmpSnoopPortEntry	1.3.6.1.4.1.207.8.4.4.4.139.10.4.1		not-accessible	A (conceptual) row in the IGMP Snooping Port Table.
INT igmpSnoopPortNumber	1.3.6.1.4.1.207.8.4.4.4.139.10.4.1.1	INTEGER	read-only	Provides the number of a port in a multicast group.
T/F igmpSnoopPortIsStatic	1.3.6.1.4.1.207.8.4.4.4.139.10.4.1.2	TruthValue	read-only	Indicates whether a port has been administratively added to a multicast group.
U32 igmpSnoopPortTimer	1.3.6.1.4.1.207.8.4.4.4.139.10.4.1.3	Unsigned32	read-only	Indicates the time remaining before the port is removed.
igmpSnoopHostTable	1.3.6.1.4.1.207.8.4.4.4.139.10.5		not-accessible	A (conceptual) table of hosts receiving multicast data.
igmpSnoopHostEntry	1.3.6.1.4.1.207.8.4.4.4.139.10.5.1		not-accessible	A (conceptual) row in the IGMP Snooping Host Table.
MAC igmpSnoopHostMAC	1.3.6.1.4.1.207.8.4.4.4.139.10.5.1.1	MacAddress	read-only	Provides the Media Access Control Address of an IGMP Host.
IP igmpSnoopHostIpAddress	1.3.6.1.4.1.207.8.4.4.4.139.10.5.1.2	IpAddress	read-only	Provides the Internet Protocol Address of an IGMP Host.
U32 igmpSnoopHostTimer	1.3.6.1.4.1.207.8.4.4.4.139.10.5.1.3	Unsigned32	read-only	Indicates the time remaining before the host times out.

RFC description

Vendor-private MIB from Allied Telesis for IGMP (Internet Group Management Protocol) management; monitors multicast group memberships and IGMP states.

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Download AT-IGMP-MIB

What Is AT-IGMP-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description