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Tuesday, May 18, 2010

%FHRP group not consistent with already configured groups on the switch stack

We get this error message if we try to do hsrp stanby group number over 999. Switch is 3750 stack. E.g syntax "standby 2844 ip x.x.x.x
does not work and error "%FHRP group not consistent with already configured groups on the switch stack" appears. If group number is lower than 1000 it goes OK to config. Any idea. Switch stack pair is WS-C3750G-24TS-E and ios c3750-ipservicesk9-mz.122-53.SE.bin.

The Catalyst 3550 can only support a maximum of 16 unique group numbers.Each of the 16 unique group numbers can be used by 16 consecutive Layer 3 interfaces, which gives a total maximum of 256 HSRP interfaces. The total number that is recommended is 64, but this number depends on the routing protocols and features that are configured on the box. If you configure too many HSRP interfaces, you could cause the CPU load on the switch to become too high, which can have unexpected side effects.

The HSRP group IDs do not have to be contiguous. You can pick any 16 group IDs in the allowed group ID range (0-255). Only 16 group IDs, however, can be used from that range.

Also there are a couple of restrictions on HSRP version 2.0.
HSRP version 2 is not available for ATM interfaces running LAN emulation.
HSRP version 2 will not inter-operate with HSRP version 1. An interface cannot operate both version 1 and version 2 because both versions are mutually exclusive. However, the different versions can be run on different physical interfaces of the same router. You cannot change from version 2 to version 1 if you have configured groups above the group number range allowed for version 1 (0 to 255).

Please click here for more details on these restrictions.

Here are some troubleshooting tips on HSRP v2.0
  1. If you configure more than 32 HSRP group instances, remove HSRP groups so that up to 32 group instances are configured.
  2. If you HSRP for IPv4 and HSRP for IPv6 at the same time then configure either HSRP for IPv4 or HSRP for IPv6 on the switch.
  3. If you configure group numbers that are not in valid ranges of 256 then configure group numbers in a valid range.
Please click here for more details on troubleshooting HSRP.

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