Sparse-Dense with Sparse will Work ?

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Oct 20th, 2009
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Dears,

I have customer Netwrok Running Sparse-Dense multicast, and we will implement Nexus 7000 ( Which supports Sparse only).

So can we configure Sparse on Nexus to work with The existing Sparse-Dense ?

If Yes, What is configuration shoud be done on the New Switches ?


Thanks,


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Giuseppe Larosa Tue, 10/20/2009 - 03:29
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Hello Mohamed,


sparse-dense-mode works on a per group basis for all groups that have an RP serving it behaves like sparse-mode.


sh ip pim rp mapping tells you for what groups there are RPs.


you may be interested in the global command


no ip pim dm-fallback


to avoid fallback to dense mode.


Hope to help

Giuseppe


seegomaa Tue, 10/20/2009 - 04:41
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Thanks Giuseppe for your reply

My question is: On the Existing PIM Configuration Sparse-dense is there, and on the new Nexus i have Sparse only, How can i make Sparse on Nexus work with the Existing Sparse-Dense ?


Thanks again for your answer


Giuseppe Larosa Tue, 10/20/2009 - 06:02
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Hello Mohamed,

as I have written in my first post, interaction should be fine for all groups treated as sparse mode.


if all your multicast traffic is in sparse mode.

sparse-dense-mode is used by autoRP to allow propagation of mapping messages on 224.0.1.39 and 224.0.1.40.


if you have user traffic in groups treated as dense mode this can be a problem


see

http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_basic_cfg_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1058990


You need to verify if sparse-dense mode is used only for autoRP or also for user traffic.


Hope to help

Giuseppe


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