HSRPv2 Dual Stack IPv4 and Ipv6

[tdcbksim90]

Does HSRPv2 that is running only on IPv4 addresses support IPv6 as well?

The fail over will work for Ipv4 but does the fail over work on Ipv6 as well?

Never tried it yet.

[Markus Benz]

Hi,

yes, HSRP is supported for IPv6 as well. But you need to configure it separately, in parallel to IPv4.
You probably need to configure different HSRP groups for IPv4 and IPv6.

Have a look at a config example here (IPV6 only):
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/15-sy/fhp-15-sy-book/HSRP-for-IPv6.html

Regards,
Markus

[tdcbksim90]

Hi Markus,

Thanks for the information.

I will look deeper into the topic and configuration.

Do you mind clarifying whether the 'yes' mentioned meant for first question or the second?

I still have some doubt on it. For example,

2 router with only HSRPv2 Ipv4 address configured without IPv6 address, will this fail over work on IPv6?

Both router are running dual stack.

[Markus Benz]

No, if there is no IPv6 HSRP configuration, there will be no failover for IPv6.

If you have neighbor discovery ra enabled, then there will be a failover, but not on HSRP level.
The host will then recognize that the router which announces itself as default gateway is unreachable and will take the second router on the list announcing itself as default gateway.

But this has nothing to do with HSRP.

Regards,
Markus

[tdcbksim90]

Thanks again Markus.

I shall take a deeper look into the router configuration.