RE: BSR and dm-fallback

Mike,

I think that might just be a CYA thing to cover places in the network where interfaces may have been configured as sparse-dense. BSR should just use 224.0.0.13 and spare-mode on all the interfaces should make dm-fallback a moot point. I have seen the same document you're talking about though and wondered the same.

-ryan

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Mike Leske
Sent: Tuesday, April 28, 2009 9:18 AM
To: Cisco certification
Subject: BSR and dm-fallback

Hi group,

I have a question regarding the command "no ip pim dm-fallback".
My understanding is, that this one can be used on interfaces configured in
"ip pim sparse-dense-mode" to prevent the interface to fall back to
dense-mode operation if a RP cannot be found.

Further, the IP Multicast configuration Guide says: "A BSR performs
similarly as an RP, except that it does not run the risk of reverting to
dense mode operation, and it does not offer the ability to scope within a
domain." (page 55)

However, section "Configuring Sparse Mode with a Bootstrap Router" on page
80/81 also has the command "no ip pim dm-fallback" included. Do we really
need that command when running BSR over sparse-mode?

Thanks
Mike

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Received on Tue Apr 28 2009 - 09:38:54 ART