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Re: So we need some scoping for non-global I2 multicast groups


Chronological Thread 
  • From: Dino Farinacci <>
  • To:
  • Cc: ,
  • Subject: Re: So we need some scoping for non-global I2 multicast groups
  • Date: Wed, 14 Jul 1999 13:35:51 -0700 (PDT)

>> The RP's forwarding table entry for the source will time out due to lack
>> of packets. (Of course, this means that in a domain running MSDP, RP's
>> should not send Register-Stop or prune back the source-specific tree,
>> in case there are group members in other domains! This is another
>> interesting change to the PIM-SM semantics that I don't think anyone
>> has thought of yet.)

No Bill, the routers inside of the domain where the source reside will
send (S,G,R) prunes toward the RP. This keeps state alive in the RP so
it can MSDP adveritse the (S,G). The case you identify is when the
source-tree doesn't go through the RP. When it does, the RP's (S,G)
olist will go NULL and it should prune to the source.

>> For N seconds. The value of N can be found by querying msdpCacheLifetime
>> in the DRAFT-MSDP-MIB (except that nobody implements it yet so there's no
>> way to determine N except by experimenting or asking).

Our implementation is set to 6 minutes.

Dino






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