Max. of groups using HSRP

[vincent-n]

Anyone out there who knows the maximum number of HSRP groups that I can have on a single router? I have a combination of Cat4K6 L3 routing module and a 3662 router. If you could also be kind enough to show me the link to the appropriate documentation. Thanks in advance for your help.

Regards

Vincent

[vcjones · Accepted solution]

To the extent that each HSRP group is to be assigned a unique MAC address (the normal mode of operation because too many boxes ignore gratuitous ARPs), the limit is 3 on 802.5 token ring and 256 on other media (see page 13 of RFC 2281).

Many older Cisco routers (such as the 4xxx and 25xx) only support a single HSRP group due to hardware limitations (search CCO for "HSRP and Lance").

As always, your mileage may vary...

Vincent C Jones

www.networkingunlimited.com