Maximum # of HSRP groups per interface

[c-charlebois]

I know that there is a limit of 16 HSRP groups per router (or upto 256 with the right hardware), but is there a limit on the number of HSRP groups on a single interface? Can all 16 HSRP groups exist on the same interface, using secondary IP addresses? I know it's a very unusual situation, but it's the one we have run into. Any knowledge, or better yet, experience on thsi would be a huge help.

[befthimi]

Theoretically, you should be able to configure 255 groups per interface, except for certain hardware limitations as you mentioned, per PFC2 in Catalyst 6500.

I am not certain, but again this may depend on the interface controller and number of mac address filters that can be applied.

[dcasanova]

thanks for the reply....probably not good practice to configure multiple secondary IPs each with it's own standby group...but this is a temporary solution for migration purposes