CENTILLION-MCAST-MIB

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Category: ATM, Vendor: Nortel

Description: Manages IP multicast routing and group membership on Nortel Centillion ATM switch platforms.

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What Is CENTILLION-MCAST-MIB?

CENTILLION-MCAST-MIB manages IP multicast routing and IGMP group-membership behavior on Nortel Centillion ATM switch platforms, part of Nortel's legacy campus ATM switching product line. It exposes per-VLAN IGMP configuration (pseudo-query and IRAP-query behavior, IGMP support enable, maximum group count) and IGMP timer settings (e.g., robustness) via indexed tables keyed by VLAN ID, alongside broader VLAN and multicast protocol-group registration objects. This MIB is used to monitor the configuration and operational status of multicast forwarding on each VLAN: whether IGMP snooping/querying is enabled and functioning, how many multicast groups are active against the configured maximum, and whether IGMP timer parameters are tuned appropriately, which is chiefly software-configuration and protocol-state monitoring rather than classic hardware sensors. It naturally depends on the standard IETF IGMP-MIB and relates to Nortel's broader Centillion VLAN/switching MIB family for VLAN identification. It was deployed in enterprise campus networks running Nortel Centillion ATM LAN-emulation switches supporting multicast video/data distribution, and administrators maintaining these legacy switches can still find a CENTILLION-MCAST-MIB download to load into a modern MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CENTILLION-MCAST-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

Nortel Centillion ATM switch

Monitoring Examples

An operator walks igmpGeneralConfigTable by igmpGeneralConfigVlanId to check igmpGeneralConfigIgmpSupport and igmpGeneralConfigMaxGroup for a given VLAN, confirming multicast is enabled and hasn't hit its configured group ceiling. Cross-referencing igmpTimerConfigTable's igmpTimerConfigTimerRobustness against observed group churn can reveal whether IGMP queries are too infrequent for a VLAN with many joins/leaves, causing stale forwarding state. If igmpGeneralConfigPseudoQuery or igmpGeneralConfigIrapQuery is misconfigured on a VLAN, multicast streams (e.g., video distribution) may fail to reach downstream ports despite the switch reporting up.

What Can Be Monitored

IGMP support enabled per VLAN
maximum multicast group count
IGMP query mode (pseudo/IRAP)
IGMP timer robustness setting
active multicast group membership

Imported Objects

From CENTILLION-ROOT-MIB

Boolean
CardId
EnableIndicator
PortId
StatusIndicator
sysConfig	OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

IpAddress

OIDs

OID symbolic	OID numeric	Type	Access	Description
vlan	1.3.6.1.4.1.930.2.1.2.31
vlanMcastProtocolGroup	1.3.6.1.4.1.930.2.1.2.31.1
vlanIGMPProtocolGroup	1.3.6.1.4.1.930.2.1.2.31.1.1
vlanIGMPConfig	1.3.6.1.4.1.930.2.1.2.31.1.1.1
igmpGeneralConfigTable	1.3.6.1.4.1.930.2.1.2.31.1.1.1.1		not-accessible	IP IGMP general configuration table which includes pseudo query, IRAP query configuration, and maximum number of groups supported in this VLAN.
igmpGeneralConfigEntry	1.3.6.1.4.1.930.2.1.2.31.1.1.1.1.1		not-accessible	IP IGMP general configuration entry. Each entry is indexed by a vlan id. An example to create the entry is: set igmpGeneralConfigIgmpSupport.3=I2 and igmpGeneralConfigMaxGroup.3=I20 to a switch ip address. (where 3 is vlan Id; 2 is enabled; 20 is maximum multicast groups to be supported for this vlan.
VLA igmpGeneralConfigVlanId	1.3.6.1.4.1.930.2.1.2.31.1.1.1.1.1.1	VlanId	read-only	The unique VLAN identifier of this IGMP configuration entry.
ENA igmpGeneralConfigPseudoQuery	1.3.6.1.4.1.930.2.1.2.31.1.1.1.1.1.2	EnableIndicator	read-write	In the absence of a true IGMP router, the switch may be configured to issue general queries. This provides the capability for multicast pruning with an isoloated subnet. The mode defaults to disabled in a VLAN configured for IGMP support
ENA igmpGeneralConfigIrapQuery	1.3.6.1.4.1.930.2.1.2.31.1.1.1.1.1.3	EnableIndicator	read-write	Control whether IGMP Router Advertisement Protocol messages will be used to determine the existence of a router in a remote switch. Default is 'enabled'.
ENA igmpGeneralConfigIgmpSupport	1.3.6.1.4.1.930.2.1.2.31.1.1.1.1.1.4	EnableIndicator	read-write	When 'enabled' is specified, it indicates that the IGMP is supported in this VLAN.
INT igmpGeneralConfigMaxGroup	1.3.6.1.4.1.930.2.1.2.31.1.1.1.1.1.5	INTEGER	read-write	The maximum number of multicast groups supported in this VLAN. If the VLAN supports only manually configured multicast groups, then the value of this field equals the length of the IGMP multicast group if the multicast group is an inclusive set. A value of 0 indicates that IGMP multicasting is not supported in this VLAN
igmpTimerConfigTable	1.3.6.1.4.1.930.2.1.2.31.1.1.1.2		not-accessible	IP IGMP Multicast timer configuration table
igmpTimerConfigEntry	1.3.6.1.4.1.930.2.1.2.31.1.1.1.2.1		not-accessible	IP IGMP Multicast timer configuration entry. Each entry is indexed by a vlan id. This entry will be created when the corresponding igmpGeneralConfigEntry is created. All the values of the mibs in this entry will be set to default at the time of creation.
VLA igmpTimerConfigVlanId	1.3.6.1.4.1.930.2.1.2.31.1.1.1.2.1.1	VlanId	read-only	The unique VLAN identifier of this multicast timer configuration entry.
INT igmpTimerConfigTimerRobustness	1.3.6.1.4.1.930.2.1.2.31.1.1.1.2.1.2	INTEGER	read-write	The robustness variable for the multicast group. A value of zero indicates the default value should be taken. If the value specified is non-zero, it should be equal or greater than 2
INT igmpTimerConfigQueryInterval	1.3.6.1.4.1.930.2.1.2.31.1.1.1.2.1.3	INTEGER	read-write	The query interval configured for the multicast group. A value of zero indicates the default value should be used. The value should be less than 0xffff
INT igmpTimerConfigQueryResponse	1.3.6.1.4.1.930.2.1.2.31.1.1.1.2.1.4	INTEGER	read-write	The response interval configured for the multicast group. A value of zero indicates the default value should be used. The value should be less than 0xffff.
igmpGroupTable	1.3.6.1.4.1.930.2.1.2.31.1.1.1.3		not-accessible	IP IGMP Multicast group address configuration table.
igmpGroupEntry	1.3.6.1.4.1.930.2.1.2.31.1.1.1.3.1		not-accessible	IP IGMP Multicast group configuration entry. Each entry is indexed by igmpGroupVlanId, igmpGroupStatic, and igmpGroupAddress
VLA igmpGroupVlanId	1.3.6.1.4.1.930.2.1.2.31.1.1.1.3.1.1	VlanId	read-only	The unique VLAN identifier of this IGMP multicast group address entry.
BOO igmpGroupStatic	1.3.6.1.4.1.930.2.1.2.31.1.1.1.3.1.2	Boolean	read-only	Indicates whether the IGMP multicast group was created statically(TRUE) by a management entity, or dynamically learned
IP igmpGroupAddress	1.3.6.1.4.1.930.2.1.2.31.1.1.1.3.1.3	IpAddress	read-only	The multicast group address(Class D). The range is from 224.0.0.0 to 239.255.255.255. The addresses from 224.0.0.0 to 224.0.0.255 are reserved IP multicast addresses.
INT igmpGroupIncluded	1.3.6.1.4.1.930.2.1.2.31.1.1.1.3.1.4	INTEGER	read-write	Indicates the multicast addresses are to be included or excluded from the group. Dynamic entries are always included and can not be modified, while static entries may be either included or excluded. For each VLAN, it only allows to configure either 'included' as static or 'excluded' as static.
STA igmpGroupStatus	1.3.6.1.4.1.930.2.1.2.31.1.1.1.3.1.5	StatusIndicator	read-write	The status of this multicast group entry: 'valid' and 'invalid'. This object enables the user to add or delete this multicast group. Setting the status as 'valid' is to add the entry; otherwise as 'invalid' is to delete the entry. An example to create an multicast group entry is: set igmpGroupStatus.3.1.224.0.0.1= valid where 3: vlan id; 1: static; 224.0.0.1: multicast group IP address
igmpRouterPortTable	1.3.6.1.4.1.930.2.1.2.31.1.1.1.4		not-accessible	IP IGMP Multicast router port table. It contains a list of the ports containing configured IGMP routers. These ports initialize the IPrDtag and IPmDtag for the group.
igmpRouterPortEntry	1.3.6.1.4.1.930.2.1.2.31.1.1.1.4.1		not-accessible	IP IGMP Multicast router port entry. Each entry is indexed by igmpRouterPortVlanId, igmpRouterPortStatic, igmpRouterPortCard, igmpRouterPortPort
VLA igmpRouterPortVlanId	1.3.6.1.4.1.930.2.1.2.31.1.1.1.4.1.1	VlanId	read-only	The unique VLAN identifier of this IGMP multicast router port entry.
BOO igmpRouterPortStatic	1.3.6.1.4.1.930.2.1.2.31.1.1.1.4.1.2	Boolean	read-only	Indicates whether the IGMP multicast router port was created statically(TRUE) by a management entity, or dynamically learned.
CAR igmpRouterPortCard	1.3.6.1.4.1.930.2.1.2.31.1.1.1.4.1.3	CardId	read-only	The card id of this multicast router port entry.
POR igmpRouterPortPort	1.3.6.1.4.1.930.2.1.2.31.1.1.1.4.1.4	PortId	read-only	The port id of this multicast router port entry.
STA igmpRouterPortStatus	1.3.6.1.4.1.930.2.1.2.31.1.1.1.4.1.5	StatusIndicator	read-write	The status of this multicast router port entry: 'valid' and 'invalid'. This object enables the user to add or delete this multicast group. Setting the status as 'valid' is to add the entry; otherwise as 'invalid' is to delete the entry. An example to create an multicast router port entry is: set igmpRouterPortStatus.3.1.5.2 = valid where 3: vlan id; 1: static; 5.2 : card/port that is connected with igmp router

RFC description

Manages multicast group configuration and IGMP protocol settings on Bay Networks Centillion switches.

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Download CENTILLION-MCAST-MIB

What Is CENTILLION-MCAST-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description