rolande
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join:2002-05-24
Powell, OH
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AT&T Midwest
| reply to lrtc
Re: PIM-SM and SPT
You are correct on the first statement. Unicast routing determines the shortest path back towards the source. The default threshold is a handful of packets if not instantaneous for the SPT join to occur. I am not sure about the MPLS behavior but I believe you have to have an MVPN configured before Multicast will be aware of this path information. Otherwise it can only use the unicast routing information to build its tree.
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