Use Same HSRP Group in a Sub-Interface

[johnlloyd_13]

hi,

i'm in a middle of a IP subnet migration/transition and would be using same HSRP group in a LAN sub-interface.

the HSRP group 31 under .30 subif will eventually be removed since it's a secondary IP.

my question, can i use HSRP group 31 on both sub-interface 30 and 31? it's only an interim or temporary design.

will they fall under the same "HSRP broadcast"?

will this design/config cause any issue? i.e. loop, network storm, etc?

interface GigabitEthernet0/0/0.30
encapsulation dot1Q 30
ip address 172.16.50.35 255.255.255.240 secondary      <<< TO BE REMOVED LATER ON
ip address 172.16.52.35 255.255.255.240
standby version 2
standby 30 ip 172.16.52.33
standby 30 priority 110
standby 30 preempt
standby 31 ip 172.16.50.33   <<< TO BE REMOVED LATER ON
standby 31 priority 110
standby 31 preempt

interface GigabitEthernet0/0/0.31   <<< NEW SUBIF/SUBNET
encapsulation dot1Q 31
ip address 172.16.52.51 255.255.255.240
standby version 2
standby 31 ip 172.16.52.49
standby 31 priority 110
standby 31 preempt

[mlund · Accepted solution]

Hi

That would not be a problem, because they are on different vlan, so they will not see each other.

If you have any doubt you can do " standby 30 ip 172.16.50.33 secondary" instead.

/Mikael