From: Bob Sinclair (bsinclair@netmasterclass.net)
Date: Wed Dec 07 2005 - 19:50:14 GMT-3
Hi John,
Let me give it a shot:
(*,G) state shows information for the shared tree, the tree to the rendezvous
point.
(S,G) state shows information for the shortest path tree.
Dense mode: (*,G) state is virtually meaningless. Dense Mode is all about
(S,G) state.
Sparse Mode: (*,G) state is the shared tree info. (S,G) state is the SPT
info.
SSM: only has (S,G) state
Bidirectional: Only has (*,G) state.
IMHO, the best descriptions are in Beau Williamson's "Developing IP Multicast
Networks"
HTH,
Bob Sinclair
CCIE #10427, CCSI 30427
www.netmasterclass.net
----- Original Message -----
From: John Matus
To: ccielab@groupstudy.com
Sent: Wednesday, December 07, 2005 5:33 PM
Subject: multicast (s,g) vs (*,g) entries
i've read several books which have discussed the entries in the multicast
routing tables - (S,G) and (*,G) entries. i understand that the S = source
and G = group, but what i just have not been able to grasp (for reasons
unbeknowst to me.........perhaps the drugs), the difference between the two
and how they relate to sparse and dense mode. can someone explain this in
simple terms so my delicate brain can understand the relevance? i seem to
remember that they have different meanings in dense mode and sparse
mode.......
TIA
Regards,
John D. Matus
Technical Support / PAS
Fujitsu Consulting
626-568-7716
John.Matus@tokiom.com
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