[c-nsp] ASR9k HSRP group reuse

[Pshem Kowalczyk]

Hi Aivars,

The bottom line is - you can not re-use them on the same physical
interface unless you can be sure that all groups with the same id will
switch-over at the same time (I'm not sure if the limitation is on the
interface level or NP level). VRRP v3 helps here, as you can have more
ids, but i'm not sure if it's implemented in 9k already.

kind regards
Pshem


On 3 June 2013 22:26, Aivars <aivars at ml.lv> wrote:
>   Hi,
>
>   Recently I encountered HSRP problem on ASR9k and as far as I
>   understand it is related to HSRP group reuse. My previous HSRP
>   knowledge stated that group number only determines stanby IP MAC
>   address and it can be resued as log as it is unique inside a
>   broadcast domain. During the incident investigation I found
>   Alexander Thuijs comment
>   https://supportforums.cisco.com/thread/2216914 about group reuse. I
>   would like to understand the problem in detail. As far as I got it,
>   when we use bridge domains, each NP has a MAC table. As soon as one
>   of the groups fails over, NP gets a request do remove it and it is
>   entirely removed even for another bridge domain. Did I get it right?
>   Could someone please clarify HSRP group reuse un 9k? It would be
>   nice to have this covered in configuration guide.
>
>   Aivars
>
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