Multicast protocol in SP cloud

Unanswered Question
Feb 6th, 2009
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Dear all,


I wanted to know why do we enable sparse mode in SP cloud when we are using SSM also. (ip ssm default). Since SSM dosent need any RP then why we need the sparse mode together to be used with SSM in the SP cloud.

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Laurent Aubert Mon, 03/30/2009 - 20:12
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  • Cisco Employee,

Hi,


PIM-SSM is just a restriction of PIM-SM.


In PIM-SM you have both (S,G) and (*,G) join/prune messages. The latest is not supported with PIM-SSM.


So you still need your PIM adjacencies thus the ip pim sparse-mode command.



HTH


Laurent.

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