Cisco Cisco IOS Software Release 12.0(12)S

This feature module describes the addition of HSRP MIB support for Simple Network Management 
Protocol (SNMP) in Cisco IOS Release 12.0(12)S. It includes information on the benefits of the new 
feature, supported platforms, supported standards, and the modified Cisco IOS commands used to 
enable HSRP monitoring.

This document includes the following sections:

Hot Standby Router Protocol (HSRP) is a protocol developed by Cisco which provides high network 
availability and transparent network topology changes. Cisco IOS Release 12.0(12)S adds support for the 
HSRP MIB (previously supported in Cisco IOS 12.0 T releases and Cisco IOS 12.1-based releases only), 
which allows the monitoring and configuration of HSRP groups using Simple Network Management 
Protocol (SNMP).

SNMP Get operations can be used from a network management system (NMS) to get reports about HSRP 
groups in a network. HSRP MIB support also allows you to enable or disable the sending of SNMP 
notifications from the Cisco IOS command-line interface (CLI). These notifications (traps or informs) are 
sent to the NMS when a routing device leaves or enters the active or standby state.

Four MIB tables are supported by this feature: cHsrpGrpEntry table, defined in CISCO-HSRP-MIB.my, 
and cHsrpExtIfTrackedEntry, cHsrpExtSecAddrEntry, and cHsrpExtIfEntry, defined in 
CISCO-HSRP-EXT-MIB.my. The cHsrpGrpEntry table consists of all the group information defined in 
RFC 2281, Cisco Hot Standby Router Protocol; the other tables consist of the Cisco extensions to 
RFC 2281, which are defined in CISCO-HSRP-EXT-MIB.my