HSRP : How many SVI can a HSRP group have ?

[jungswon93]

hi . i know in hsrp version 2 can have 4095 hsrp group 

l3 switch`s limit is 4095 

my question -How many hsrp groups can a single vlan interface have?

[paul driver]

Hello
Can you elaborate on what you mean, HSRP groups provide resiliency to a network so as each SVI relates to a single network then only one svi per hsrp group would be applicable.
HSRPv1 support upto 255 groups
HSRPv2 supports upto 4095 groups.

[balaji.bandi]

adding to other comments.

How many hsrp groups can a single vlan interface have?

You can 1 or if you secondary interface you can do other group - is this make sense - if we understand clear ?

here is some reference :

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3550-series-switches/44143-hsrp-cat3550-limit-44143.html#q3

[Richard Burts]

I do not want to be overly picky but it seems to me that there is some ambiguity about what question is being asked. The title of the post asks one question "many SVI can a HSRP group have?" and the text of the post asks a different question "How many hsrp groups can a single vlan interface have?" I believe that the first question is quite simple - a single HSRP group on a vlan could be connected on many switches in that vlan and each switch could have an SVI in that vlan using that HSRP group. So there effectively is no limit. The second question is more interesting. My colleague @paul driver suggests that the answer is " each SVI relates to a single network then only one svi per hsrp group would be applicable" My colleague @balaji.bandi makes the point that with the possibility of secondary addressing that the limit is greater than one. I will suggest a different way of thinking about this question. I have seen implementations running on a single subnet on 2 switches that do load sharing with HSRP. Let us think about switchA and switchB using subnet 192.168.1.0 on the SVIs. Both switches configure an HSRP group 10 specifying the virtual address as 192.168.1.10. The configuration specifies priority such that switchA is active and switchB is standby. Both switches configure an HSRP group 20 specifying the virtual address as 192.168.1.20. The configuration specifies priority such that switchB is active and switchA is standby. The configuration of hosts in this subnet specify that half of them use 192.168.1.10 as their gateway and other hosts in this subnet use 192.168.1.20 as their gateway. In this setup both switches are forwarding traffic and there is failover if a single switch fails. Clearly 2 HSRP groups in an SVI works. What if there were 3 switches? Would it work to have 3 HSRP groups? What if there were 10 switches? Would 10 HSRP groups work? Is there really a limit?