HSRP Group IDs are limited to 16 on PFC2

On the catalyst 6500 switches, the maximum number of HSRP group IDs are limited to 16 in the Supervisor Engine 2-based systems. This limit is 256 in all other older and newer systems. You receive the below message when you try to create a new standby group after this limit.

More than 16 standby groups not supported in this platform.

Cisco says that this is a per-interface limit so you can use the same ID in several interfaces.

You can find the details on “HSRP Group Limitation on Catalyst 6500/6000 Series Switches Frequently Asked Questions

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