Do the timers (hello and hold) have to match between HSRP routers? I thought they had to, but when I tried it in lab, it didn't make any changes to the existing active and standby roles.
What's the best practice of numbering "standby group number"? If I have two vlans between two HSRP routers, I tried using just "standby 1" for both interface vlans, and also "standby 1" for one vlan and "standby 2" for the other, but I didn't see any changes as far as the standby group functions.
Standby group are used to create a unique virtual mac address (0000 0C07 ACXX where XX represents the HSRP group number) associated to the IP virtual address configured for this group. Layer 3 switches can handle the same mac address on different L3 interfaces that's why you can configure the same standby group on different VLAN interface.
Thanks a lot. I always used "standby 1" for about half of the VLANs on the L3 switch, and "standby 2" for the other half of the VLANs. I never had any problems with it. But I never really though about why.
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