Re: PIM Interoperability issue

Hi Naman,

A router running PIMv1 on its interface will not learn about the BSR
advertised RP-set, but could still learn an RP from AutoRP. I would be
more concerned about the behaviour of the PIMv2 routers in that scenario.

If AutoRP and BSR cause the same RP to be advertised/selected, then
things may be ok. If instead Auto RP and BSR are sending conflicting
advertisements onto the subnet, which would a PIMv2 router prefer for a
given group, or would its entry flap between the two possibilities?
If PIMv2 routers prefer AutoRP, the election throughout the network
should be consistent with the PIMv1 routers. If not, and different
routers believe that different RPs are responsible for the same group,
then things are likely to break.

Running both on a network should be easy enough to lab, though it may
not be supported and would be unnecessarily complicated for a live
scenario (and perhaps too complicated for the lab). In real deployments
many people prefer static RP configs and Anycast RP.

Paul.

naman sharma wrote:
> Hi Experts,
>
> Auto-RP can run in both PIM Version 1 and Version 2. BSR is a Pim Version 2
> specification.
>
> Also it says that BSR mechanism interoperates with Auto-RP on Cisco routers.
> Does it interperates with Auto-RP Pim Version 1 or Version 2.
>
> thanks
> Naman
>
>
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Received on Tue May 05 2009 - 22:14:15 ART