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HSRP groups limited to 16 after upgrade to c3550-i5q3l2-mz.121-13.EA1c

Before upgrading a 3550 there were more than 16 HSRP groups in use (only 16 differant numbers used), some using the same group numbers on different interfaces.

Since the upgrade to c3550-i5q3l2-mz.121-13.EA1c the 3550 complains that only 16 groups are supported on this platform. This happens even if the same numbers are utilised on different interfaces.

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Cisco Employee

Re: HSRP groups limited to 16 after upgrade to c3550-i5q3l2-mz.1

There are only 16 HSRP Virtual MAC addresses space available in the hardware mac-address-table. Due to the following bug, the CLI in older IOS permitted you to configure more than 16 HSRP groups

http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdy31376

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