HSRP version 2

[message4mayank]

Hi, 

Would like to know whether HSRP version 2 is having any known instabilities or bugs ?

Is that advisable to migrate from HSRP ver 1 to HSRP ver 2 ?  This will need downtime ?

Thanks

[InayathUlla Sharieff]

I havent seen the instabilities or bugs related to HSRP v1 or V2. It all depends on case to case with the issues which they face but not with the protocol.

Here are few updates on HSRP Version 2:-

It advertises and learns millisecond timer values. This change ensures stability of the HSRP groups in all cases.
It expands the group number range from 0 to 4095 and consequently uses a new MAC address range 0000.0C9F.F000 to 0000.0C9F.FFFF.
It provides improved management and troubleshooting: the HSRP version 2 packet format includes a 6-byte identifier field that is used to uniquely identify the sender of the message. Typically, this field is populated with the interface MAC address.
It uses the new IP multicast address 224.0.0.102 to send hello packets instead of the multicast address of 224.0.0.2, which is used by version 1. This new multicast address allows CGMP leave processing to be enabled at the same time as HSRP.
It’s really easy implement HSRP version 2; it is required to use only one command more than HSRP version 1: standby version 2

NOTE: HSRP version 2 will not interoperate with HSRP version 1. An interface cannot operate both version 1 and version 2 because both versions are mutually exclusive.

HTH

Regards

Inayath

[InayathUlla Sharieff]

Is that advisable to migrate from HSRP ver 1 to HSRP ver 2 ?  This will need downtime ?

Answer:- YES.

 (since HSRP Version 1 and Version 2 use completely different virtual MAC addresses and IP multicast addresses, they will not communicate with one another, even if configured to use the same HSRP group number on the same network segment.)

Hope this answers your query.