Hi there,
In addition to Jon,few advantages and difference between hsrp v1 and V2.
Version 1 is the default version of HSRP.
HSRP version 2 uses the new IP multicast address 224.0.0.102 to send hello packets instead of the multicast address of 224.0.0.2, used by HSRP version 1. This new multicast address allows CGMP leave processing to be enabled at the same time as HSRP.
HSRP version 2 permits an expanded group number range, 0 to 4095, and consequently uses a new MAC address range 0000.0C9F.F000 to 0000.0C9F.FFFF. The increased group number range does not imply that an interface can, or should, support that many HSRP groups. The expanded group number range was changed to allow the group number to match the VLAN number on subinterfaces.
When the HSRP version is changed, each group will reinitialize because it now has a new virtual MAC address .
HSRP version 1:-
· Maximum number of group supported –256 ( 0 -255 )
· Mac used – 0000.0c07.ac00 to 0000.0c07.acff (which can conflict with CGMP leave processing)
· Hello packet multicast address is 224.0.0.2
· Default version ( in both catalyst and Nexus switches )
· Only Text authentication with cisco password is supported.
HSRP version 2:-
· Maximum number of group supported – 4096 ( 0 – 4095 ).
· Mac address used – 0000.0c9f.f000 – 0000.0c9ffff.
· Hello packet multicast address 224.0.0.102 which removes the problem with version1
· Need to enable version 2 explicitly.
· Supports MD5 authentication
Note :-
HSRP version 1 and 2 have different Packet format
Both are not compatible to each other. Both side of interface must have identical version.
HTH
Regards,
VS.Suresh.
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