Cisco Cisco IOS Software Release 12.2(33)SRE

© 2007 Cisco Systems, Inc. All rights reserved.

The FHRP—HSRP Multiple Group Optimization feature improves the negotiation and maintenance of 
multiple Hot Standby Router Protocol (HSRP) groups configured on a subinterface. Only one HSRP 
group is required on a physical interface for the purposes of electing active and standby routers. This 
group is known as the master group. Other HSRP groups may be created on each subinterface and linked 
to the master group via the group name. These linked HSRP groups are known as client or follow groups.

Configuration information is included in the “Configuring HSRP” module of the Cisco IOS IP 
Application Services Configuration Guide, Release 12.4T,

at the following URL:

The following sections provide information about this feature:

HSRP Multiple Group Optimization

Improving CPU and Network Performance with HSRP Multiple Group Optimization

Improving CPU and Network Performance with HSRP Multiple Group Optimization: Example

For a complete list of features included in the “Configuring HSRP” module, see the Feature Information 
Table located toward the end of the module.

Command reference information is included in the Cisco IOS IP Application Services Command 
Reference, Release 12.2SR, at the following URL:

The following commands are new or modified for this feature: