Cisco Cisco IOS Software Release 12.4(11)T

© 2006 Cisco Systems, Inc. All rights reserved.

The FHRP – Hot Standby Router Protocol (HSRP) Bidirectional Forwarding Detection (BFD) Peering 
feature introduces BFD in the HSRP group member health monitoring system. Previously, HSRP group 
member monitoring relied exclusively on HSRP multicast messages, which are relatively large and 
consume CPU memory to produce and check. In architectures where a single interface hosts a large 
number of groups, there is a need for a lighter protocol. BFD addresses this issue and offers sub-second 
health monitoring at a relatively low CPU impact.

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

at the following URL:

The following sections provide information about this feature:

HSRP BFD Peering

Configuring HSRP BFD Peering

Verifying HSRP BFD Peering

HSRP BFD Peering: Example

For additional configuration information for BFD, see the

document, at the following URL:

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 12.4T, at the following URL: