CISCO-SWITCH-CEF-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2011-12-15

Category: Cisco Devices, MPLS and Traffic Engineering, Routing Protocols

Description: Manages CEF (Cisco Express Forwarding) on switch ASICs including FIB and adjacency table statistics.

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What Is CISCO-SWITCH-CEF-MIB?

CISCO-SWITCH-CEF-MIB is a Cisco enterprise MIB that manages Cisco Express Forwarding (CEF) on the ASICs of Cisco Layer 2/Layer 3 switches, including support for VRF, MPLS, and EoMPLS environments. It exposes data on the CEF forwarding information base (FIB), covering counts of IPv4 and IPv6 routes broken out by unicast, multicast, VRF, non-VRF, global, and link-local categories. As a performance and capacity monitoring MIB, it is used to track hardware forwarding-table health and utilization -- for example detecting when route counts approach ASIC table limits, which can cause silent packet drops or CEF exceptions well before a device shows any other symptom. It builds on core Cisco switching conventions and is typically used alongside standard IP-MIB and Cisco's other forwarding/route MIBs rather than in isolation. It is deployed on Cisco switches and multilayer switches (e.g., Catalyst/Nexus platforms) running CEF-based forwarding, monitored to catch FIB scaling issues and forwarding anomalies before they impact traffic. Engineers can download the CISCO-SWITCH-CEF-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-SWITCH-CEF-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 Catalyst switches
Cisco Nexus switches
Cisco Layer 2/Layer 3 multilayer switches

Monitoring Examples

An administrator would poll cscSwitchCefStatsTable/cscSwitchCefStatsEntry alongside counters like cscIpv4UnicastRoutes, cscIpv4VrfRoutes, cscIpv6UnicastRoutes, and cscIpv6MulticastRoutes to track how many routes are programmed into the hardware CEF table. A sudden plateau or drop in cscIpv4NonVrfRoutes despite growing routing-table size in the control plane would indicate the FIB has hit an ASIC capacity limit and new routes are being punted to software forwarding, causing performance degradation. Comparing cscIpv6VrfRoutes against configured VRF route budgets helps confirm multi-tenant or MPLS L3VPN scaling stays within hardware limits.

What Can Be Monitored

IPv4 unicast/multicast route counts
IPv6 unicast/multicast route counts
VRF vs non-VRF route counts
CEF hardware FIB table utilization
global and link-local IPv6 route counts

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From ENTITY-MIB

entPhysicalIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Gauge32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using cscIpv4NonVrfRoutes OID:

Select a Cisco Catalyst/Nexus Layer 2/3 switch (CEF) 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 cscIpv4NonVrfRoutes into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The total number of IPv4 non VRF routes. 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, 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
ciscoSwitchCefMIB	1.3.6.1.4.1.9.9.790			This MIB module defines management objects for the CEF features on Cisco Layer 2 and Layer 3 devices. Definition of some of the terms used in this MIB: CEF - Cisco Express Forwarding. VPN - Virtual private network. VRF - VPN Routing and Forwarding instance. MPLS - Multiprotocol Label Switching EoMPLS - Ethernet over MPLS
ciscoSwitchCefMIBNotifs	1.3.6.1.4.1.9.9.790.0
ciscoSwitchCefMIBObjects	1.3.6.1.4.1.9.9.790.1
cscStats	1.3.6.1.4.1.9.9.790.1.1
cscSwitchCefStatsTable	1.3.6.1.4.1.9.9.790.1.1.1		not-accessible	This table provides CEF statistics for switching engines.
cscSwitchCefStatsEntry	1.3.6.1.4.1.9.9.790.1.1.1.1		not-accessible	An entry providing CEF statistics information maintained by a particular switching engine entity (identified by entPhysicalIndex). An entry of this table is created if a switch engine with these CEF statistics is detected by the managed system. An entry of this table is deleted if the removal of the switching engine itself.
G32 cscIpv4NonVrfRoutesEx	1.3.6.1.4.1.9.9.790.1.1.1.1.1	Gauge32	read-only	The total number of IPv4 non VRF routes.
G32 cscIpv4VrfRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.2	Gauge32	read-only	The total number of IPv4 VRF routes.
G32 cscIpv4MulticastRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.3	Gauge32	read-only	The total number of IPv4 multicast routes.
G32 cscIpv4UnicastRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.4	Gauge32	read-only	The total number of IPv4 unicast routes.
G32 cscIpv6GlobalRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.5	Gauge32	read-only	The total number of IPv6 global routes.
G32 cscIpv6NonVrfRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.6	Gauge32	read-only	The total number of IPv6 non VRF routes.
G32 cscIpv6VrfRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.7	Gauge32	read-only	The total number of IPv6 VRF routes.
G32 cscIpv6LinkLocalRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.8	Gauge32	read-only	The total number of IPv6 link-local routes.
G32 cscIpv6MulticastRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.9	Gauge32	read-only	The total number of IPv6 multicast routes.
G32 cscIpv6UnicastRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.10	Gauge32	read-only	The total number of IPv6 unicast routes.
G32 cscMplsRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.11	Gauge32	read-only	The total number of MPLS routes.
G32 cscMplsVpnRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.12	Gauge32	read-only	The total number of MPLS VPN routes.
G32 cscEomL2Routes	1.3.6.1.4.1.9.9.790.1.1.1.1.13	Gauge32	read-only	The total number of EoMPLS L2 routes.
G32 cscEomIpv4MulticastRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.14	Gauge32	read-only	The total number of EoMPLS Ipv4 Multicast routes.
G32 cscEomIpv6MulticastRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.15	Gauge32	read-only	The total number of EoMPLS Ipv6 Multicast routes.
G32 cscTotalRoutes	1.3.6.1.4.1.9.9.790.1.1.1.1.16	Gauge32	read-only	The total number of routes.
ciscoSwitchCefMIBConform	1.3.6.1.4.1.9.9.790.2
cscSwitchCefMIBCompliances	1.3.6.1.4.1.9.9.790.2.1
cscSwitchCefMIBCompliance	1.3.6.1.4.1.9.9.790.2.1.1			The compliance statement for CISCO-SWITCH-CEF-MIB.
cscSwitchCefMIBGroups	1.3.6.1.4.1.9.9.790.2.2
cscSwitchCefIpv4StatsGroup	1.3.6.1.4.1.9.9.790.2.2.1			A collection of objects providing Ipv4 statistics for switching engines.
cscSwitchCefIpv6StatsGroup	1.3.6.1.4.1.9.9.790.2.2.2			A collection of objects providing Ipv6 statistics for switching engines.
cscSwitchCefIpv6GlobalStatsGroup	1.3.6.1.4.1.9.9.790.2.2.3			A collection of objects providing Ipv6 Global statistics for switching engines.
cscSwitchCefIpv6LinkLocalGroup	1.3.6.1.4.1.9.9.790.2.2.4			A collection of objects providing Ipv6 Link Local Route statistics for switching engines.
cscSwitchCefEomL2Group	1.3.6.1.4.1.9.9.790.2.2.5			A collection of objects providing EoMPLS L2 Route statistics for switching engines.
cscMplsStatsGroup	1.3.6.1.4.1.9.9.790.2.2.6			A collection of objects providing MPLS Route statistics for switching engines.
cscMplsStatsGroupExt	1.3.6.1.4.1.9.9.790.2.2.7			A collection of objects providing additional MPLS CEF statistics for switching engines.
cscTotalStatsGroup	1.3.6.1.4.1.9.9.790.2.2.8			A collection of objects providing MPLS CEF statistics for switching engines.

RFC description

Cisco vendor-private MIB for Cisco Express Forwarding (CEF) switching fabric status and statistics on Catalyst switches.

Start monitoring Cisco Catalyst/Nexus Layer 2/3 switches (CEF) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CISCO-SWITCH-CEF-MIB