CISCO-FABRIC-MCAST-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2002-08-20

Category: Cisco Devices, Routing Protocols

Description: Provides management objects for monitoring fabric-level multicast replication and distribution on Cisco high-end platforms.

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What Is CISCO-FABRIC-MCAST-MIB?

CISCO-FABRIC-MCAST-MIB is a Cisco-specific MIB for high-end SAN and data-center switching platforms (such as the MDS series) that use a switch fabric to replicate multicast traffic internally. It exposes data about Fabric Multicast Group Identifier (FGID) pool allocation, including how many FGIDs exist in total, how many are currently in use, and per-pool and per-logical-router usage, tracked across pool tables. This is primarily a resource-capacity/configuration MIB rather than a hardware-health MIB: it lets an operator monitor internal fabric resource exhaustion (e.g. FGID pool nearing capacity) which can be an early indicator of scaling problems on the switch, though it does not expose CPU, memory, temperature, or power-supply status directly. It builds on Cisco's chassis and logical-router (LR) concepts used elsewhere in Cisco MDS MIBs, so it is typically deployed alongside other Cisco fabric-management MIBs. It is used in data-center SAN environments where operators need visibility into internal multicast replication resource consumption on Cisco fabric switches. Engineers can download the CISCO-FABRIC-MCAST-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-FABRIC-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

Cisco MDS SAN switch
Cisco Nexus fabric switch
Cisco MDS series SAN/Fibre Channel switches

Monitoring Examples

An administrator would poll cfmGenInfoTotalFgids against cfmGenInfoInuseFgids and cfmGenInfoHighWaterInuseFgids to see how close the switch is to exhausting its global FGID pool, and would walk cfmPoolTable/cfmPoolEntry (indexed by cfmPoolId, with cfmPoolName, cfmPoolType, cfmPoolTotalFgids, cfmPoolInuseFgids) to check per-pool utilization. A rising cfmPoolHighWaterInuseFgids approaching cfmPoolTotalFgids on a given pool would flag an impending fabric multicast resource exhaustion condition before new multicast groups fail to allocate. The cfmLrTable extends this view per logical router in a virtualized MDS chassis.

What Can Be Monitored

total FGID pool capacity
in-use FGIDs
high-water mark of FGID usage
per-pool FGID allocation
per-logical-router FGID usage

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From ENTITY-MIB

entLogicalIndex

OBJECT-TYPE

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Gauge32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using cfmGenInfoTotalFgids OID:

Select a Cisco MDS Fibre Channel switch 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 cfmGenInfoTotalFgids into the Find box to locate it in the OID tree, then select it and click OK. The total number of FGIDs resource are detected in the managed system. 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 Gauge32-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 (in fgid), 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
ciscoFabricMcastMIB	1.3.6.1.4.1.9.9.255			Fabric Multicast Resource MIB module. This MIB module is used for managing/tracking the fabric multicast resource related information. Acronyms and terms: FGID - Fabric Multicast Group Identifier. LR - Logical router.
ciscoFabricMcastMIBNotifs	1.3.6.1.4.1.9.9.255.0
ciscoFabricMcastMIBObjects	1.3.6.1.4.1.9.9.255.1
cfmGeneral	1.3.6.1.4.1.9.9.255.1.1
G32 cfmGenInfoTotalFgidsEx	1.3.6.1.4.1.9.9.255.1.1.1	Gauge32	read-only	The total number of FGIDs resource are detected in the managed system.
G32 cfmGenInfoInuseFgids	1.3.6.1.4.1.9.9.255.1.1.2	Gauge32	read-only	The current number of FGIDs that are currently in use by the managed system.
G32 cfmGenInfoHighWaterInuseFgids	1.3.6.1.4.1.9.9.255.1.1.3	Gauge32	read-only	The highest number of FGIDs that was in use by all fabric multicast client applications in the managed system.
cfmPool	1.3.6.1.4.1.9.9.255.1.2
cfmPoolTable	1.3.6.1.4.1.9.9.255.1.2.1		not-accessible	This table contains fabric multicast resource pool information.
cfmPoolEntry	1.3.6.1.4.1.9.9.255.1.2.1.1		not-accessible	The information regarding a single fabric multicast resource pool. An entry of this table is created when a fabric multicast dedicated pool related client application is registered to fabric software or the first of fabric multicast shared pool related client application is registered to fabric software. An entry of this table is removed when the the last fabric multicast client application is unregistered from the pool.
CFM cfmPoolId	1.3.6.1.4.1.9.9.255.1.2.1.1.1	CfmPoolIndex	not-accessible	An index that uniquely represents a fabric multicast resource pool. This index is assigned arbitrarily by the fabric software when fabric multicast application clients register for the use of fabric multicast resource.
STR cfmPoolName	1.3.6.1.4.1.9.9.255.1.2.1.1.2	SnmpAdminString	read-only	The object to indicate FGID pool name.
INT cfmPoolType	1.3.6.1.4.1.9.9.255.1.2.1.1.3	INTEGER	read-only	The object to indicate FGID pool type. shared(1) - the pool is shared by multiple types of FGID clients. dedicated(2) - the pool is dedicated for a specific type of client to use. The dedicated pool is normally used by a critical client to prevent processes deadlock during system initialization or restart.
G32 cfmPoolTotalFgids	1.3.6.1.4.1.9.9.255.1.2.1.1.4	Gauge32	read-only	The total number of FGIDs in this pool. The total size might be dynamically adjusted based on the utilization of each pool or if a fabric multicast resource related entity is added or removed (e.g., add a new fabric rack or upgrade an old fabric rack to new fabric rack).
G32 cfmPoolInuseFgids	1.3.6.1.4.1.9.9.255.1.2.1.1.5	Gauge32	read-only	The current number of FGIDs in this pool that are currently in use by the FGID clients from one or more logical routers.
G32 cfmPoolHighWaterInuseFgids	1.3.6.1.4.1.9.9.255.1.2.1.1.6	Gauge32	read-only	The highest number of FGIDs in this pool that was in use by the FGID clients from one or more logical routers.
cfmLr	1.3.6.1.4.1.9.9.255.1.3
cfmLrTable	1.3.6.1.4.1.9.9.255.1.3.1		not-accessible	This table contains fabric multicast resource information for a logical router.
cfmLrEntry	1.3.6.1.4.1.9.9.255.1.3.1.1		not-accessible	The information regarding a single logical router that uses fabric multicast resource. An entry of this table is created when a logical router is created in the entLogicalTable of ENTITY-MIB and the logical router is registered for fabric multicast resource service. A logical router is identified by the value of mib-2 in entLogicalType object of ENTITY-MIB. An entry of this table is removed when the entry associated logical router is removed from entLogicalTable of ENTITY-MIB.
G32 cfmLrInuseFgids	1.3.6.1.4.1.9.9.255.1.3.1.1.1	Gauge32	read-only	The current number of FGIDs that are currently in use by this logical router.
G32 cfmLrHighWaterInuseFgids	1.3.6.1.4.1.9.9.255.1.3.1.1.2	Gauge32	read-only	The highest number of FGIDs that was in use by this logical router.
ciscoFabricMcastMIBConform	1.3.6.1.4.1.9.9.255.2
cfmMIBCompliances	1.3.6.1.4.1.9.9.255.2.1
cfmMIBCompliance	1.3.6.1.4.1.9.9.255.2.1.1			The compliance statement for entities which implement the CISCO-FABRIC-MCAST-MIB
cfmMIBGroups	1.3.6.1.4.1.9.9.255.2.2
cfmGenInfoGroup	1.3.6.1.4.1.9.9.255.2.2.1			A collection of objects providing the general fabric multicast resource related configuration and statistics capability.
cfmPoolGroup	1.3.6.1.4.1.9.9.255.2.2.2			A collection of objects providing information for the fabric multicast resource pools.
cfmLrGroup	1.3.6.1.4.1.9.9.255.2.2.3			A collection of objects providing information for the logical routers that use the fabric multicast resource.

RFC description

Multicast resource management for Cisco fabric switches, tracking fabric group identifiers and logical router multicast configuration.

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Download CISCO-FABRIC-MCAST-MIB