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CHAPTER
27-1
Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
27
Hot Standby Router Protocol and Virtual Router
Redundancy Protocol
This feature module describes the HOT Standby Router Protocol(HSRP) and Virtual Router Redundancy
Protocol(VRRP) features. The Hot Standby Router Protocol (HSRP) is a First Hop Redundancy Protocol
(FHRP) designed to allow transparent fail-over of the first-hop IP router. HSRP provides high network
availability by providing first-hop routing redundancy for IP hosts on Ethernet, Fiber Distributed Data
Interface (FDDI), Bridge-Group Virtual Interface (BVI), LAN Emulation (LANE), or Token Ring
networks configured with a default gateway IP address. HSRP is used in a group of routers for selecting
an active router and a standby router.
The Virtual Router Redundancy Protocol (VRRP) eliminates the single point of failure inherent in the
static default routed environment . VRRP is not an election protocol in itself; rather it specifies an
election protocol that dynamically assigns responsibility for a virtual router.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature
information and caveats, see the release notes for your platform and software release. To find information
about the features documented in this module, and to see a list of the releases in which each feature is
supported, see the “Feature Information for HSRP and VRRP” section on page 27-11.
Use Cisco Feature Navigator to find information about platform support and Cisco software image
support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on
Cisco.com is not required.
Contents
• Information About HSRP and VRRP, page 27-2
• How to Configure HSRP, page 27-3
• Configuration Examples for HSRP, page 27-5
• How to Configure VRRP, page 27-6
• Configuration Examples for VRRP, page 27-8
• Where to Go Next
• Additional References, page 27-9