The Extension MIB module for the CISCO-HSRP-MIB which is
based on RFC2281.

This MIB provides an extension to the CISCO-HSRP-MIB which 
defines Cisco's proprietary Hot Standby Routing Protocol 
(HSRP), defined in RFC2281. The extensions cover assigning 
of secondary HSRP ip addresses, modifying an HSRP Group's 
priority by tracking the operational status of interfaces, 
etc. 

Terminology:
HSRP is a protocol used amoung a group of routers for the 
purpose of selecting an active router and a standby router. 

An active router is the router of choice for routing 
packets.

A standby router is a router that takes over the routing 
duties when an active router fails, or when preset 
conditions have been met.

A HSRP group or a standby group is a set of routers 
which communicate using HSRP. An HSRP group has a group 
MAC address and a group IP address. These are the 
designated addresses. The active router assumes  
(i.e. inherits) these group addresses. An HSRP group is
identified by a ( ifIndex, cHsrpGrpNumber ) pair.

BIA stands for Burned In Address.