[j-nsp] Multicast, ASM and SSM

[Judd, Michael (Michael)]

Chris,

Thanks for the information. This is a good start. I had considered setting this up in a lab but I suspected that it would not tell me much and I would not be able to reproduce such a problem. I will post what I find if it would be of any interest.

Regards

Mike

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-----Original Message-----
From: Chris Spears [mailto:cspears at eng.oar.net] 
Sent: Wednesday, July 29, 2009 5:29 PM
To: Judd, Michael (Michael)
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Multicast, ASM and SSM

Michael-

   SSM is working, so you've already verified that PIM is configured, as well as IGMP on the LAN.  If it's on the network side, it's most likely a MSDP (or RP) problem.  Some odd IGMP issues on the local switched network could cause a problem, and well as buggy host problems, both of which are harder to diagnose.

   Start at the DR router (the one closest to non-receiving beacon). 
Verify that the RP-mapping is there, and a route to the RP.   Check the 
RP to ensure that MSDP has a source-active for the group (or if the DR 
router is the RP, just check it there).   Verify RPF along the way. 
Also remember that MSDP needs to have inet.2 & interface-routes, just like PIM, so if you created a PIM rib-group, apply it to MSDP as well.

   This of course assumes that because you're using beacons there are several active sources and listeners. Otherwise, always check for active sources and listener interest first.

-Chris


Judd, Michael (Michael) wrote:
> question; I am working on an issue where a multicast beacon receives SSM sources but not ASM sources. Other beacons in the network can see both ASM and SSM. I am wondering what I should check first.
> 
> Thank you
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net 
> https://puck.nether.net/mailman/listinfo/juniper-nsp

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Chris Spears, OARnet
Senior Routing Engineer
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