RE: Verifying SSM

You can use ping to verify it. The multicast sender doesn't participate in multicast routing, so they are just blindly forwarding traffic onto the LAN. The receiver needs to already know who the sender is though. The application itself, e.g. IPTV, already knows the senders through some out of band mechanism. The receiver sends an IGMPv3 join message onto the LAN specifying the (S,G) it wants to receive. When the PIM router on the LAN receives this, it build a shortest path tree to the source using a (S,G) PIM join up the reverse path back to the source.

HTH,

Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan_at_INE.com
 
Internetwork Expert, Inc.
http://www.INE.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Rich Collins
Sent: Wednesday, March 09, 2011 11:31 AM
To: ccielab_at_groupstudy.com
Subject: Verifying SSM

Hi,

While looking at the vrf-lite multicast thread I revisited SSM.

How does one about testing SSM? I suppose you need to generate an
igmpv3 join but the ping to the multicast group is normally igmpv2...
Is there a method with "ip sla"?

Thanks
Rich

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Received on Wed Mar 09 2011 - 12:14:47 ART