CTRON-IGMP-MIB

All MIBs › CTRON-IGMP-MIB

Organization: Enterasys Networks, Inc

Last Updated: 2005-05-09

Category: IP and Core Protocols, VLAN and Bridging, Vendor: Cabletron/Enterasys

Description: Manages Cabletron IGMP (Internet Group Management Protocol) snooping, group membership, and multicast filtering.

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What Is CTRON-IGMP-MIB?

CTRON-IGMP-MIB is a Cabletron Systems enterprise MIB for managing IGMP (Internet Group Management Protocol) snooping, multicast group membership, and multicast filtering on Cabletron switches, as stated in its module description covering IGMP configuration under the Cabletron enterprise OID. It exposes per-VLAN IGMP configuration (query interval, querier state, protocol version, max response time) as well as global defaults and statistics counters for group table usage. For monitoring it lets an operator check whether a VLAN currently has an active IGMP querier, confirm the configured query interval and version match expectations, and watch statistics/group-table-full-action objects to catch when the multicast group table is overflowing, which would explain dropped multicast streams rather than any CPU/temperature issue. It operates as a Cabletron-specific extension layered on top of the standard IGMP protocol (RFC 2236/3376) rather than the IETF IGMP MIB directly. It is deployed on Cabletron/Enterasys Layer 2/3 switches supporting IGMP snooping in multicast-heavy environments such as video distribution networks, and administrators can perform a CTRON-IGMP-MIB download to load these objects into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CTRON-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

Cabletron/Enterasys Layer 2/3 switch

Monitoring Examples

An administrator would poll ctIGMPVlanTable/ctIGMPVlanEntry indexed by ctIGMPVlanId to check ctIGMPVlanQuerier and ctIGMPVlanStatus, confirming a VLAN has an active querier and correct ctIGMPVlanVersion and ctIGMPVlanQueryInterval settings. The ctIGMPStatsCntrs counters would be watched to detect abnormal group join/leave rates, and ctIGMPConfigGroupTblFullAction combined with ctIGMPNewDefaultState would be checked when multicast group table exhaustion is suspected, since the configured full-table action determines whether new joins are dropped or an old entry is evicted. A VLAN missing a querier (ctIGMPVlanQuerier absent or query interval mismatched) would indicate multicast traffic may not be properly pruned to only interested ports.

What Can Be Monitored

per-VLAN IGMP querier presence
IGMP protocol version per VLAN
query interval and max response time
multicast group table full-action/state
IGMP statistics counters

Imported Objects

From BRIDGE-MIB

dot1dBasePort

OBJECT-TYPE

From CTRON-MIB-NAMES

ctIGMPBranch

OBJECT-IDENTITY

From IF-MIB

InterfaceIndex

From Q-BRIDGE-MIB

PortList
VlanId

From SNMPv2-SMI

Counter32
Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

DisplayString
RowStatus
TEXTUAL-CONVENTION
TruthValue

How to Use in IPNetwork Monitor

Example using ctIGMPStatsCntrsNumV1QueriesSent OID:

Select a Cabletron/Enterasys Layer 2/3 switch (IGMP snooping) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type ctIGMPStatsCntrsNumV1QueriesSent into the Find box to locate it in the OID tree, then select it and click OK. The number of IGMP Version 1 queries this device has sent out. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ctIGMP	1.3.6.1.4.1.52.4.1.3.5.1			This MIB module defines a portion of the SNMP enterprise MIBs under the Cabletron enterprise OID pertaining to configuration of IGMP.
ctIGMPConfig	1.3.6.1.4.1.52.4.1.3.5.1.1
INT ctIGMPNewDefaultState	1.3.6.1.4.1.52.4.1.3.5.1.1.1	INTEGER	read-write	This object defines the state in which IGMP will view new VLAN IDs added to the system. A value of Enable (1), indicates that IGMP will create entries for all new VLANs in the ENABLE state. A value of Disable (2), indicates IGMP will create entries for all new VLANs in the DISABLED or 'not in service' state.
I32 ctIGMPMibRev	1.3.6.1.4.1.52.4.1.3.5.1.1.2	Integer32	read-only	This object defines the revision of the IGMP MIB in the firmware.
STR ctIGMPMibRevString	1.3.6.1.4.1.52.4.1.3.5.1.1.3	DisplayString	read-only	This object is a textual representation of the revision of the IGMP MIB in the firmware.
INT ctIGMPConfigGroupTblFullAction	1.3.6.1.4.1.52.4.1.3.5.1.1.4	INTEGER	read-write	This object defines the behavior of IGMP when its group table is full. The user may choose to send multicast frames to known routers, or flood these frames to the vlan.
ctIGMPVlanTable	1.3.6.1.4.1.52.4.1.3.5.1.2		not-accessible	The (conceptual) table listing the VLANs on which IGMP is enabled.
ctIGMPVlanEntry	1.3.6.1.4.1.52.4.1.3.5.1.2.1		not-accessible	An entry (conceptual row) representing a VLAN on which IGMP is enabled.
VLA ctIGMPVlanId	1.3.6.1.4.1.52.4.1.3.5.1.2.1.1	VlanId	not-accessible	The VlanId value of the Vlan for which IGMP is enabled.
I32 ctIGMPVlanQueryInterval	1.3.6.1.4.1.52.4.1.3.5.1.2.1.2	Integer32	read-create	The frequency at which IGMP Host-Query packets are transmitted on this Vlan.
ROW ctIGMPVlanStatus	1.3.6.1.4.1.52.4.1.3.5.1.2.1.3	RowStatus	read-create	The activation of a row enables IGMP on the Vlan. The destruction of a row disables IGMP on the Vlan.
INT ctIGMPVlanVersion	1.3.6.1.4.1.52.4.1.3.5.1.2.1.4	INTEGER	read-create	The version of IGMP which is running on this Vlan. This object can be used to configure a switch capable of either value. For IGMP to function correctly, all and routers on a Vlan must be configured to run the same version of IGMP on that Vlan.
IP ctIGMPVlanQuerier	1.3.6.1.4.1.52.4.1.3.5.1.2.1.5	IpAddress	read-only	The address of the IGMP Querier on the Vlan to which this switch is attached.
I32 ctIGMPVlanQueryMaxResponseTime	1.3.6.1.4.1.52.4.1.3.5.1.2.1.6	Integer32	read-create	The maximum query response time advertised in IGMPv2 queries on this Vlan.
I32 ctIGMPVlanRobustness	1.3.6.1.4.1.52.4.1.3.5.1.2.1.7	Integer32	read-create	The Robustness Variable allows tuning for the expected packet loss on a Vlan. If a Vlan is expected to be lossy, the Robustness Variable may be increased. IGMP is robust to (Robustness Variable-1) packet losses.
I32 ctIGMPVlanLastMembQueryIntvl	1.3.6.1.4.1.52.4.1.3.5.1.2.1.8	Integer32	read-create	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.
I32 ctIGMPVlanQuerierUpTime	1.3.6.1.4.1.52.4.1.3.5.1.2.1.9	Integer32	read-only	The number of seconds since ctIGMPVlanQuerier was last changed.
I32 ctIGMPVlanQuerierExpiryTime	1.3.6.1.4.1.52.4.1.3.5.1.2.1.10	Integer32	read-only	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.
IP ctIGMPVlanQuerierIP	1.3.6.1.4.1.52.4.1.3.5.1.2.1.11	IpAddress	read-create	The source IP address used by a switch when acting as IGMP querier for a Vlan. The value chosen must be in the valid IP address space for any attached routed interface(s) on the Vlan. A value of 0.0.0.0 indicates that the switch will not act as querier for the Vlan.
ctIGMPCacheTable	1.3.6.1.4.1.52.4.1.3.5.1.3		not-accessible	The (conceptual) table listing the IP multicast groups for vlans with members on a particular interface.
ctIGMPCacheEntry	1.3.6.1.4.1.52.4.1.3.5.1.3.1		not-accessible	An entry (conceptual row) in the ctIGMPCacheTable.
IP ctIGMPCacheAddress	1.3.6.1.4.1.52.4.1.3.5.1.3.1.1	IpAddress	not-accessible	The IP multicast group address for which this entry contains information.
VLA ctIGMPCacheVlanId	1.3.6.1.4.1.52.4.1.3.5.1.3.1.2	VlanId	not-accessible	The VlanId for which this entry contains information.
NUM ctIGMPCacheIfIndex	1.3.6.1.4.1.52.4.1.3.5.1.3.1.3	InterfaceIndex	not-accessible	The interface for which this entry contains information for an IP multicast group address.
IP ctIGMPCacheLastReporter	1.3.6.1.4.1.52.4.1.3.5.1.3.1.4	IpAddress	read-only	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.
TIK ctIGMPCacheUpTime	1.3.6.1.4.1.52.4.1.3.5.1.3.1.5	TimeTicks	read-only	The time since the system joined this group address, or zero if the system is not currently a member.
TIK ctIGMPCacheExpiryTime	1.3.6.1.4.1.52.4.1.3.5.1.3.1.6	TimeTicks	read-only	The minimum amount of time remaining before this entry will be aged out.
I32 ctIGMPCacheVersion1HostTimer	1.3.6.1.4.1.52.4.1.3.5.1.3.1.7	Integer32	read-only	The time remaining until the local switch 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 switch ignores any IGMPv2 Leave messages for this group that it receives on this interface.
ctIGMPPolicyTable	1.3.6.1.4.1.52.4.1.3.5.1.4		not-accessible	The (conceptual) table listing the IGMP group policy for vlans with members on a particular interface.
ctIGMPPolicyEntry	1.3.6.1.4.1.52.4.1.3.5.1.4.1		not-accessible	An entry (conceptual row) in the ctigmpPolicyTable.
IP ctIGMPPolicyAddress	1.3.6.1.4.1.52.4.1.3.5.1.4.1.1	IpAddress	not-accessible	The IP multicast group address for which this entry contains information. A value of 224.0.0.0 indicates all multicast groups.
I32 ctIGMPPolicyVlanId	1.3.6.1.4.1.52.4.1.3.5.1.4.1.2	Integer32	not-accessible	The VlanId for which this entry contains information.
NUM ctIGMPPolicyIfIndex	1.3.6.1.4.1.52.4.1.3.5.1.4.1.3	InterfaceIndex	not-accessible	The interface for which this entry contains information for an IP multicast group address. A value of zero indicates all ports.
ROW ctIGMPPolicyStatus	1.3.6.1.4.1.52.4.1.3.5.1.4.1.4	RowStatus	read-create	The activation of a row enables IGMP policy for this entry. The destruction of a row disables any IGMP policy for this entry.
INT ctIGMPPolicyInclusion	1.3.6.1.4.1.52.4.1.3.5.1.4.1.5	INTEGER	read-create	The IGMP policy for this entry.
ctIGMPStaticTable	1.3.6.1.4.1.52.4.1.3.5.1.5		not-accessible	The (conceptual) table listing the static IGMP entries.
ctIGMPStaticEntry	1.3.6.1.4.1.52.4.1.3.5.1.5.1		not-accessible	An entry (conceptual row) representing a static entry that IGMP will act upon.
IP ctIGMPStaticGroupAddress	1.3.6.1.4.1.52.4.1.3.5.1.5.1.1	IpAddress	not-accessible	The IP multicast group address for IGMP to send multicast data to.
I32 ctIGMPStaticVlanId	1.3.6.1.4.1.52.4.1.3.5.1.5.1.2	Integer32	not-accessible	The VlanId for IGMP to send multicast data to.
POR ctIGMPStaticOutPortList	1.3.6.1.4.1.52.4.1.3.5.1.5.1.3	PortList	read-write	The set of ports configured by management for this multicast group and this VLAN to which multicast group-addressed data frames are to be forwarded.
ROW ctIGMPStaticRowStatus	1.3.6.1.4.1.52.4.1.3.5.1.5.1.4	RowStatus	read-create	The activation of a row creates a static entry. The destruction of a row deletes a static entry.
ctIGMPStaticGroupTable	1.3.6.1.4.1.52.4.1.3.5.1.6		not-accessible	The (conceptual) table listing the static IGMP entries.
ctIGMPStaticGroupEntry	1.3.6.1.4.1.52.4.1.3.5.1.6.1		not-accessible	An entry (conceptual row) representing a static entry that IGMP will act upon.
IP ctIGMPStaticGroupIPAddress	1.3.6.1.4.1.52.4.1.3.5.1.6.1.1	IpAddress	not-accessible	The IP multicast group address for IGMP to send multicast data to.
VLA ctIGMPStaticGroupVlanId	1.3.6.1.4.1.52.4.1.3.5.1.6.1.2	VlanId	not-accessible	The VlanId for IGMP to send multicast data to.
IP ctIGMPStaticGroupSourceIPAddress	1.3.6.1.4.1.52.4.1.3.5.1.6.1.3	IpAddress	not-accessible	The IP source address of this entry. For IGMP Version 2, use 0.0.0.0
POR ctIGMPStaticGroupIncludeList	1.3.6.1.4.1.52.4.1.3.5.1.6.1.4	PortList	read-write	The set of ports configured by management for this multicast group and this VLAN to which multicast group-addressed data frames are to be forwarded.
POR ctIGMPStaticGroupExcludeList	1.3.6.1.4.1.52.4.1.3.5.1.6.1.5	PortList	read-write	The set of ports configured by management for this multicast group and this VLAN for which received IGMP reports will not be accepted.
ROW ctIGMPStaticGroupRowStatus	1.3.6.1.4.1.52.4.1.3.5.1.6.1.6	RowStatus	read-create	The activation of a row creates a static entry. The destruction of a row deletes a static entry. Not in service disables a static entry
ctIGMPExtCacheTable	1.3.6.1.4.1.52.4.1.3.5.1.7		not-accessible	The (conceptual) table listing the IP multicast groups for vlans with members on a particular interface. This table provides a version 3 capable ctIGMPCacheTable, with a bridge portlist leaf vs mib2 interface index.
ctIGMPExtCacheEntry	1.3.6.1.4.1.52.4.1.3.5.1.7.1		not-accessible	An entry (conceptual row) in the ctIGMPCacheTable.
IP ctIGMPExtCacheAddress	1.3.6.1.4.1.52.4.1.3.5.1.7.1.1	IpAddress	not-accessible	The IP multicast group address for this entry.
VLA ctIGMPExtCacheVlanId	1.3.6.1.4.1.52.4.1.3.5.1.7.1.2	VlanId	not-accessible	The VlanId for this entry
IP ctIGMPExtCacheSourceIPAddress	1.3.6.1.4.1.52.4.1.3.5.1.7.1.3	IpAddress	not-accessible	The IP source address of this entry.
IP ctIGMPExtCacheLastReporter	1.3.6.1.4.1.52.4.1.3.5.1.7.1.4	IpAddress	read-only	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.
TIK ctIGMPExtCacheUpTime	1.3.6.1.4.1.52.4.1.3.5.1.7.1.5	TimeTicks	read-only	The time since the system joined this group address, or zero if the system is not currently a member.
TIK ctIGMPExtCacheExpiryTime	1.3.6.1.4.1.52.4.1.3.5.1.7.1.6	TimeTicks	read-only	The minimum amount of time remaining before this entry will be aged out.
I32 ctIGMPExtCacheVersion1HostTimer	1.3.6.1.4.1.52.4.1.3.5.1.7.1.7	Integer32	read-only	The time remaining until the local switch 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 switch ignores any IGMPv2 Leave messages for this group that it receives on this interface.
POR ctIGMPExtCacheOutPortList	1.3.6.1.4.1.52.4.1.3.5.1.7.1.8	PortList	read-only	The set of bridge ports for this multicast group, VLAN, and source IP address, to which multicast group-addressed data frames are being forwarded.
I32 ctIGMPExtCacheSrcPort	1.3.6.1.4.1.52.4.1.3.5.1.7.1.9	Integer32	read-only	The source bridge port of the multicast data stream if available
ctIGMPDiscoveredRouterTable	1.3.6.1.4.1.52.4.1.3.5.1.8		not-accessible	The (conceptual) table listing the routers seen on particular ports of a vlan through either protocol snooping or ICMP Router Discovery.
ctIGMPDiscoveredRouterEntry	1.3.6.1.4.1.52.4.1.3.5.1.8.1		not-accessible	An entry representing the routers seen on particular ports on a given vlan id.
VLA ctIGMPDiscoveredRouterVlanId	1.3.6.1.4.1.52.4.1.3.5.1.8.1.2	VlanId	not-accessible	The VlanId for IGMP to send multicast data to.
POR ctIGMPDiscoveredRouterPortList	1.3.6.1.4.1.52.4.1.3.5.1.8.1.3	PortList	read-only	The set of bridge ports that IGMP has seen routing protocols, IGMP queries, or ICMP Router Discovery frames on.
POR ctIGMPDiscoveredRouterEgressPortList	1.3.6.1.4.1.52.4.1.3.5.1.8.1.4	PortList	read-only	The set of bridge ports that IGMP believes has valid egress.
POR ctIGMPDiscoveredRouterStaticPortList	1.3.6.1.4.1.52.4.1.3.5.1.8.1.5	PortList	read-write	The set of bridge ports to flood all multicast frames to for this vlan id. This leaf is OPTIONAL
ctIGMPPortTable	1.3.6.1.4.1.52.4.1.3.5.1.9		not-accessible	The (conceptual) table listing a bridge port's bindings to multicast group addresses, vlan ids, and source addresses.
ctIGMPPortTableEntry	1.3.6.1.4.1.52.4.1.3.5.1.9.1		not-accessible	An entry representing the binding of bridge port to multicast group address, vlan id, and source IP address.
IGM ctIGMPPortMode	1.3.6.1.4.1.52.4.1.3.5.1.9.1.1	IgmpPortModeTc	not-accessible	The mode of the given bridge port.
IP ctIGMPPortTableGroupAddress	1.3.6.1.4.1.52.4.1.3.5.1.9.1.2	IpAddress	not-accessible	The multicast group address bound to this port entry.
VLA ctIGMPPortTableVlanId	1.3.6.1.4.1.52.4.1.3.5.1.9.1.3	VlanId	not-accessible	The vlan id bound to this port entry.
IP ctIGMPPortTableSourceIPAddress	1.3.6.1.4.1.52.4.1.3.5.1.9.1.4	IpAddress	not-accessible	The IP source address bound to this port entry.
I32 ctIGMPPortTableExpireTime	1.3.6.1.4.1.52.4.1.3.5.1.9.1.5	Integer32	read-only	The time in seconds that this port will expire in.
ctIGMPStatsCntrs	1.3.6.1.4.1.52.4.1.3.5.1.10
T/F ctIGMPStatsCntrsGroupFull	1.3.6.1.4.1.52.4.1.3.5.1.10.1	TruthValue	read-only	Flag to indicate if the group table is full(true) or not(false).
C32 ctIGMPStatsCntrsNumV1QueriesSentEx	1.3.6.1.4.1.52.4.1.3.5.1.10.2	Counter32	read-only	The number of IGMP Version 1 queries this device has sent out.
C32 ctIGMPStatsCntrsNumV2QueriesSent	1.3.6.1.4.1.52.4.1.3.5.1.10.3	Counter32	read-only	The number of IGMP Version 2 queries this device has sent out.
C32 ctIGMPStatsCntrsNumV3QueriesSent	1.3.6.1.4.1.52.4.1.3.5.1.10.4	Counter32	read-only	The number of IGMP Version 3 queries this device has sent out.
C32 ctIGMPStatsCntrsNumGSQueriesSent	1.3.6.1.4.1.52.4.1.3.5.1.10.5	Counter32	read-only	The number of Group Specific queries this device has sent out.
C32 ctIGMPStatsCntrsNumQueriesRcvd	1.3.6.1.4.1.52.4.1.3.5.1.10.6	Counter32	read-only	The number of IGMP queries this device has seen from the network.
C32 ctIGMPStatsCntrsNumV1ReportsRcvd	1.3.6.1.4.1.52.4.1.3.5.1.10.7	Counter32	read-only	The number of IGMP Version 1 reports this device has received.
C32 ctIGMPStatsCntrsNumV2ReportsRcvd	1.3.6.1.4.1.52.4.1.3.5.1.10.8	Counter32	read-only	The number of IGMP Version 2 reports this device has received.
C32 ctIGMPStatsCntrsNumV3ReportsReceived	1.3.6.1.4.1.52.4.1.3.5.1.10.9	Counter32	read-only	The number of IGMP Version 3 reports this device has received.
C32 ctIGMPStatsCntrsNumLeavesReceived	1.3.6.1.4.1.52.4.1.3.5.1.10.10	Counter32	read-only	The number of IGMP leaves this device has received.
C32 ctIGMPStatsCntrsNumDroppedFrames	1.3.6.1.4.1.52.4.1.3.5.1.10.11	Counter32	read-only	The number of frames dropped by IGMP on this device.
ctIGMPProtocolClassificationTable	1.3.6.1.4.1.52.4.1.3.5.1.11		not-accessible	This table contains a listing of how IGMP will classify received IP protocol frames. For example, for a UDP multicast frame received which is IP type 17, IGMP can classify that frame in one of three ways. It can be classified as a multicast data frame, a routing protocol, or it can be ignored. A user may have a need to multicast TCP frames, but still want to send them ONLY to IGMP clients. To do this one would set protocol id 6(TCP) to 'multicastPata'
ctIGMPProtocolClassificationEntry	1.3.6.1.4.1.52.4.1.3.5.1.11.1		not-accessible	An entry representing the binding of IP protocol id, to the IGMP classification of a received frame.
IGM ctIGMPProtocolClassification	1.3.6.1.4.1.52.4.1.3.5.1.11.1.1	IgmpProtocolClassTc	not-accessible	The classification of this protocol id. 1 - Classify as multicast data frame. 2 - Classify as a routing protocol. 3 - Classify as Ignore.
IGM ctIGMPProtocolIdentifier	1.3.6.1.4.1.52.4.1.3.5.1.11.1.2	IgmpProtocolIdTc	read-write	The set of IP protocol ids to apply the classification to. Example: If this set has protocols(bits) 1 and 5 set to a '1', and the classification is 'multicastData', this will force IGMP to treat received frames with IP protocol ids of 1 and 5 as 'multicast data', and forward those frames to IGMP joined clients. Similarly if ids 1 and 5 were set to 'routing protocol' then IGMP would treat received frames with these ids as routing protocols, etc.

RFC description

Cabletron/Enterasys enterprise MIB for IGMP configuration and multicast group management.

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