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How many Hot Standby Routing Protocol (HSRP) groups can I configure on a VIP ?

April 26, 2017configure groups hot hsrp Protocol routing standby VIP

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How many Hot Standby Routing Protocol (HSRP) groups can I configure on a VIP ?

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A. Even if, theoretically, you can configure up to 255 different groups, the MAC address filter table on each VIP interface has a limit of 32 entries. If some entries are already used for multicast — Cisco Discovery Protocol, Inter-Switch Link (ISL), and so on — the number of HSRP groups that you can configure on any interface on a specific VIP varies a little. After the integration of CSCuk29834 ( registered customers only) in Cisco IOS Software Releases 12.2(8) and 12.2(8)T, the show standby capability command indicates how many entries are left for HSRP groups. Moreover, a warning appears when someone tries to configure more groups than what is allowed due to the MAC address list filter size limitation. In order to bypass this limitation, use the standby use-bia interface configuration command to use the burned-in address instead of a virtual MAC address from the router pool.