Cisco Cisco IOS Software Release 12.2(27)SBC

© 2006, 2007 Cisco Systems, Inc. All rights reserved.

The BGP Support for Next-Hop Address Tracking feature is enabled by default when a supporting 
Cisco IOS software image is installed. Border Gateway Protocol (BGP) next-hop address tracking is 
event driven. BGP prefixes are automatically tracked as peering sessions are established. Next-hop 
changes are rapidly reported to the BGP routing process as they are updated in the Routing Information 
Base (RIB). This optimization improves overall BGP convergence by reducing the response time to 
next-hop changes for routes installed in the RIB. When a best-path calculation is run in between BGP 
scanner cycles, only next-hop changes are tracked and processed.

Configuration information is included in the “Configuring Advanced BGP Features” module of the 
Cisco IOS BGP Configuration Guide, Release 12.4T, at the following URL:

The following sections provide information about this feature:

BGP Support for Next-Hop Address Tracking 

Configuring BGP Next-Hop Address Tracking 

Enabling and Disabling BGP Next-Hop Address Tracking: Example 

Adjusting the Delay Interval for BGP Next-Hop Address Tracking: Example 

For a complete list of features included in the “Configuring Advanced BGP Features” module, see the 
Feature Information table located toward the end of the module.

The following command is new or modified for this feature: