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32 HSRP groups supported by 3750

ace-cco
Level 1
Level 1

I have a big problem,

the 3750 should support 32 HSRP groups, but if i configure this groups, there are only 17 groups possible, when i configure HSRP group number 18, there is the message

%Platform does not support more than 32 HSRP groups

whats wrong,

i tried to configure more than 1 vlan-interface in one HSRP group, but it is all the same

thanks for reply

2 Replies 2

Kevin Dorrell
Level 10
Level 10

I don't know about the 3750, but on the 3550 there are additional implementation-derived limitations on the re-use of HSRP groups on different VLANs. The algorithm is quite complicated, but see the links below. Now, I can find these limitations in the 3550 documentation but not in the 3750. But I don't know whether the same limitations apply to the 3750 but they simply have not documented it.

Here are the doc references, FWIW:

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225se/3550scg/swhsrp.htm#wp1044151

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12225se/3750scg/swhsrp.htm#wp1044151

Does the limitation described in the 3550 document fit your scenario?

Kevin Dorrell

Luxembourg

Is there any reason why you need different HSRP group numbers? Are you bridging between VLANs? Are you connecting to another Vendors switch that doesn't create a CAM table per VLAN?

If you are not bridging between VLAN's or connecting to another Vendors switch then just use the same HSRP Group number:

interface VLAN 10

ip address 10.1.1.1 255.255.255.0

standby 10 10.1.1.254

!

interface VLAN 20

ip address 10.2.1.1 255.255.255.0

standby 10 10.2.1.254

!

interface VLAN 30

ip address 10.3.1.1 255.255.255.0

standby 10 10.3.1.254

!

etc

Andy

Review Cisco Networking for a $25 gift card