No multicast Registration message received at the RP

Unanswered Question
Oct 27th, 2008
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Hi

I have 3 routers, in series, configured for Auto-RP SM, with two hosts directly connected at each end. The hosts can ping end-end and each router has the correct RP info.

Now, when I ping from the source to some multicast address I see the expected results at the RP i.e. the Register message and the corresponding (S,G) and (*,G) entries.

The problem I have is when I repeat this process using VLC media player to stream a video to a multicast address. I do not receive the (S,G) entry or the Register message at the RP - I only see a Join/Prune message and only have a (*,G) entry.

Can someone please explain why I do not get this expected Register message and why there is no (S,G)entry???


This is driving me crazy!


Thank you very much



STEP1 - Send a multicast ping (224.2.2.2) from the source.


STEP2 - Check the RP has a (*,G) entry and a (S,G) entry


R4#sh ip mroute


(*, 224.2.2.2), 00:00:11/stopped, RP 150.1.4.4, flags: SP

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list: Null


(171.68.37.122, 224.2.2.2), 00:00:12/00:02:47, flags: P

Incoming interface: FastEthernet0/1, RPF nbr 171.68.28.137

Outgoing interface list: Null




STEP 3 - Check the RP debugs to see the register message from the DR to the RP.


R4#debug ip pim


*Mar 1 00:45:44.967: PIM(0): Building Periodic Join/Prune message for 224.2.2.2

R4#

*Mar 1 00:45:47.255: PIM(0): Received v2 Register on FastEthernet0/1 from 171.68.28.189

*Mar 1 00:45:47.255: (Data-header) for 171.68.37.122, group 224.2.2.2

*Mar 1 00:45:47.255: PIM(0): Send v2 Register-Stop to 171.68.28.189 for 171.68.37.122, group 224.2.2.2





STEP4 - Repeat using VLC to multicast a video stream from the source this time


STEP5 - Check the RP has a (*,G) entry and a (S,G) entry. THERE IS NO (S,G) ENTRY !!!!!!!


R4#sh ip mroute


(*, 224.3.3.3), 00:14:26/00:02:51, RP 150.1.4.4, flags: S

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list:

FastEthernet0/1, Forward/Sparse, 00:14:26/00:02:51



STEP6 - Check the RP debugs to see the register message from the DR. THERE IS NO REGISTER MESSAGE !!!!!!!!!!!


R4#

*Mar 1 00:49:06.147: PIM(0): Received v2 Join/Prune on FastEthernet0/1 from 171.68.28.137, to us

*Mar 1 00:49:06.147: PIM(0): Join-list: (*, 224.3.3.3), RPT-bit set, WC-bit set, S-bit set

*Mar 1 00:49:06.147: PIM(0): Update FastEthernet0/1/171.68.28.137 to (*, 224.3.3.3), Forward state, by PIM *G Join

R4#


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Harold Ritter Mon, 10/27/2008 - 05:15
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  • Cisco Employee,

Walter,


VLC sets the TTL to 1 by default. Make sure you increase that value so that traffic can propagate end to end.


Regards

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