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Cisco Bug: CSCtc54288 - ASR Platform implementation of FHRP Init Delay Registry needed

Last Modified

Jun 15, 2010

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)


Changing the group number associated with a virtual IP address causes hosts to lose contact with the virtual router.


The situation occurs when a virtual IP address is associated with one group, and then that group is unconfigured and the same virtual address used by another group. Since each group is uniquely associated with a virtual MAC address the ARP tables of all hosts that were using the previous group will contain invalid entries.

If the interface is shut while configuring new groups then gratuitous ARPs will be sent to refresh any hosts' ARP tables before the interface is ready to forward traffic. The hosts will not realise that the vIP/vMAC association in their ARP tables are invalid and will be unable to forward traffic via the known (virtual IP) gateway.
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