Table Of Contents
HSRP MD5 Authentication
Prior to the introduction of the HSRP MD5 Authentication feature, Hot Standby Router Protocol (HSRP) authenticated protocol packets with a simple plain text string. The HSRP MD5 Authentication feature is an enhancement to generate an MD5 digest for the HSRP portion of the multicast HSRP protocol packet. This feature provides added security and protects against the threat from HSRP-spoofing software.
Configuration information is included in the "Configuring HSRP" module in the "First Hop Redundancy Protocols" section of the Cisco IOS IP Application Services Configuration Guide, Release 12.4T, at the following URL:
The following section provides information about this feature:
•Configuring HSRP Authentication
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
Command reference information is included in the Cisco IOS IP Application Services Command Reference, Release 12.2SX, at the following URL:
New or Modified Commands
The following commands are new or modified for this feature:
Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.
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