hsrp version 2... why?

because the default is version 1? warning:  ver 1 and ver 2 are not compatible...

dls1(config-if)#do sh stand
Vlan1 - Group 1
  State is Active
    3 state changes, last state change 3d14h
  Virtual IP address is 172.16.1.3
  Active virtual MAC address is 0000.0c07.ac01
    Local virtual MAC address is 0000.0c07.ac01 (v1 default)
  Hello time 3 sec, hold time 10 sec
    Next hello sent in 1.436 secs
  Preemption enabled
  Active router is local
  Standby router is 172.16.1.2, priority 90 (expires in 3.432 sec)
  Priority 150 (configured 150)
  IP redundancy name is "hsrp-Vl1-1" (default)
Vlan10 - Group 1
  State is Active
    3 state changes, last state change 3d14h
  Virtual IP address is 172.16.10.3

dls1(config-if)#standby ver 2
dls1(config-if)#do sh standby
Vlan1 - Group 1 (version 2)
  State is Active
    3 state changes, last state change 3d14h
  Virtual IP address is 172.16.1.3
  Active virtual MAC address is 0000.0c9f.f001
    Local virtual MAC address is 0000.0c9f.f001 (v2 default)
  Hello time 3 sec, hold time 10 sec
    Next hello sent in 0.204 secs
  Preemption enabled
  Active router is local
  Standby router is unknown
  Priority 150 (configured 150)
  IP redundancy name is "hsrp-Vl1-1" (default)
Vlan10 - Group 1
  State is Active
    3 state changes, last state change 3d14h
  Virtual IP address is 172.16.10.3
  Active virtual MAC address is 0000.0c07.ac01
    Local virtual MAC address is 0000.0c07.ac01 (v1 default)
  Hello time 3 sec, hold time 10 sec
    Next hello sent in 2.220 secs
 --More--

i set the hsrp version as 2 for vlan 1 only... you'll have to do this for each interface...

version 2 supports groups from 0 to 4095 (vlans anybody?)
although if your network needs to support that many vlans, you may have other concerns...

also ver 2 multicasts hello's to 224.0.0.102 allowing cgmp  (cisco's proprietary  igmp) to function properly

it can advertise and learn millisecond timer values, and includes a 6 byte field identifying the sender of the message

and it says version 2... version 1 doesn't say version 1... i like when versions say what they are...

note: version 1 shows up as 0 in a pcap...