>From what I understand, JOINs aren't send towards the source, they are sent to >the RP.
Sources don't know where receivers are; they just forward the traffic at layer two to their nearest multicast neighbor/router. It's up to the neighbor/router and upstream RP to build the tree. The register-stop message occurs once the source/tree is built. I think this is the normal function of the RP, and how it works regardless of implementation. Behaves the same way in Alcatel-Lucent and Cisco. -Mark Williams -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ben Greear Sent: Thursday, March 13, 2014 10:45 AM To: Holger Kummert Cc: [email protected] Subject: Re: [Xorp-users] PIM/SM: Missing Join and Register-Stop from RP On 03/13/2014 10:31 AM, Holger Kummert wrote: > > Hello, > > I do not understand XORP's behavior when running PIM/SM and Register > messages (that encapsulate multicast traffic) are received by the RP > from S. > What I am really missing is the Join msg towards S in order to avoid > the encapsulating overhead. Therefore the Register-Stop (in order to > stop sending the Register msgs) is also not sent by RP. > > Shouldn't both messages be sent according to RFC 4601, ch. 3.2? > > The only situation where I could force the Register-Stop to be sent > was by enabling and setting 'switch-to-spt-threshold' to '0'. > This sending is independent of any Join'ed receivers and happens > immediately after the receive of the first Register message. > But this is obviously not the intended usage. > > Anyhow under no circumstances any Join messages are sent by RP to S. > > Could someone give more insight on this? I'm afraid I never knew much about multicast, and what I did learn while hacking on xorp mcast logic I have mostly forgotten. But, if you figure out a patch that makes xorp work better, please post it and I will try to review it. Thanks, Ben > > > Thanks in advance, > Holger > > _______________________________________________ > Xorp-users mailing list > [email protected] > http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users > -- Ben Greear <[email protected]> Candela Technologies Inc http://www.candelatech.com _______________________________________________ Xorp-users mailing list [email protected] http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users _______________________________________________ Xorp-users mailing list [email protected] http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users
