- rwth-multicast - lists.rwth-aachen.de

Re: [rwth-multicast] [Xorp-users] join messages not sent out (from IGMP to PIM)
by Daniel Sievers 08 Dec '05

08 Dec '05

> To track the problem, wait until the Cisco router stops forwarding > the traffic, and then check the related state: > 1. The PIM Join state inside Cisco > 2. The PIM Join state inside XORP > 3. The IGMP group state inside XORP. > Yes, unfortunately all of them look good :) I believe there might be a bug in the Cisco Software. (it's a Catalyst 3750, in the documentation I was able to find what you said about PIM-Snooping and it should support it) Setup is LAN <-> xorp DR <-> C3750 <-> RP(xorp) <-> Source The Cisco has attached other LANs, some of them running xorp, others have a bridge between their LAN and the Cisco and thus do not need xorp. (*) So maybe the bug even occurs only because of the mixed setup, where the C3750 has to perform IGMP Snooping on some, while PIM-Snooping on other ports. The behaviour is weird: -After launching xorp, multicast groups will only be received from the Cisco for about 5 minutes -Crafting an IGMP Join for specific multicast groups will make it send again (that specific group only) for 2 minutes or so -Also it sends IGMP Queries to xorp, but according to the documentation the IGMP Querier should be automatically disabled due to our setup (e.g. having PIM routers attached) Guess we should contact Cisco about this.... Thanks again! -Daniel (*) Btw, Sammy and Carsten Otto (C-Otto), who told me that you have helped them greatly too so far with a whole bunch of mails, are administrating networks attached to that same C3750 on our campus network :)

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[Fwd: Re: [Xorp-users] join messages not sent out (from IGMP to PIM)]
by Daniel Sievers 08 Dec '05

08 Dec '05

-------- Original Message -------- Subject: Re: [Xorp-users] join messages not sent out (from IGMP to PIM) Date: Thu, 08 Dec 2005 12:04:49 -0800 From: Pavlin Radoslavov <pavlin(a)icir.org> To: Daniel Sievers <sievers(a)hilton.rwth-aachen.de> CC: Pavlin Radoslavov <pavlin(a)icir.org> > Hrmm... and what happens in such a setup: > > LAN (with Multicast receivers) <-------> xorp DR <----> PIM-SM Router > A<----> non-PIM aware Switch <------> PIM-SM Router B > > > How can the non-PIM aware switch perform IGMP Snooping if Router A and B > communicate through PIM only? It would have to forward all multicast > traffic, which would be bad if there were other ports on that switch > with no multicast receivers. The most efficient solution would be PIM snooping: ttp://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/swcg/snoop… If the switch is not PIM-aware, then PIM-SM Router A should be the router that originates IGMP Join messages for each group joined via PIM-SM. Doing something like this was already discussed on the PIM mailing list few months ago (see the following email and the follow-ups): http://www1.ietf.org/mail-archive/web/pim/current/msg00483.html However, so far it is only an idea and there is no a document to describe it. > Wouldn't it be good if xorp had at least an option to forward IGMP > Reports from the LAN? (and better also reply to IGMP Queries from the > outside with all groups subscribed to on the inside LAN) To do something like this would require XORP to implement IGMP snooping. Implementing IGMP snooping is on our TODO list, but it is a relatively low priority task and it may take a while until it is implemented. > P.S.: Should we take this back to the mailinglist? I missed CCing that > the last time. As you wish. Pavlin

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[Fwd: Re: [Xorp-users] join messages not sent out (from IGMP to PIM)]
by Daniel Sievers 08 Dec '05

08 Dec '05

-------- Original Message -------- Subject: Re: [Xorp-users] join messages not sent out (from IGMP to PIM) Date: Thu, 08 Dec 2005 11:39:24 -0800 From: Pavlin Radoslavov <pavlin(a)icir.org> To: Daniel Sievers <sievers(a)hilton.rwth-aachen.de> CC: Pavlin Radoslavov <pavlin(a)icir.org> > Daniel Sievers wrote: > > Our xorp router receives multicast traffic from a cisco 3750 pim-sm > > enabled router. The cisco will send igmp queries to 224.0.0.1 and xorp > > will reply for "all-routers.mcast.net" and "pim-routers.mcast.net", but > > btw, I assume it replies for these 2 groups because the router itself is > an actual receiver of them (used for bootstrapping info etc.) Yes. Pavlin

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Frage zu dem Stand
by Alexander Grümmer 07 Dec '05

07 Dec '05

Hallo, so habe jetzt auch mal die Liste subscriped ;) Hier auch gleich mal die erste Frage: Wie ist der stand der Dinge? Ich habe hier am Montag bis 3 Uhr morgens mit carsten Otto gesessen und die Firewall vom Kullen für Multicast aufgemacht und xorp intalliert. Leider mußte wir festellen das alle Wohnheime das selbe Problem haben. Der Stream bricht immer nach 4 bis 5 Minuten ab ohne das man auch nur den Hauch einer Meldung im xorp bekommt. Es scheint so als würde der Cisco Router/Switch die Packete nach 4 bis 5 min nicht mehr schicken. Gruß Alexander PS: Die Leute sind hier ganz heiß daraf weil die Kabelqulität in den Wohnheimen so schlecht ist. Per Unicast wird der ansturm kaum zu bewältigen sein. ;) -- Alexander Grümmer Netzwerk-AG Kullenhof

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Re: [rwth-multicast] Stand der Dinge
by Carsten Otto 07 Dec '05

07 Dec '05

Hallo! Ich fasse mal zusammen, was mir bekannt ist. Halifax: Funktioniert ohne Probleme in beiden Richtungen, seitdem für den Adressbereich ein eigener RP eingestellt wurde. Hat nach der XORP-Installation (und richtiger Konfiguration) sofort auch für nur eingehendes Multicast funktioniert. Kullen: Geklärt. Kawo2: IGMP-Probleme intern, mit Außenanbindung keine Probleme (Tests waren erfolgreich) - mit Bridge. Schillerstr: Läuft (wie?). Bärenstr: Läuft (wie?). Hilton: Afaik das gleiche Problem wie im Kullen. Hermann: Senden funktioniert (ich kann empfangen), Empfang anscheinend nicht. Die XORP-Config müssten wir nochmal vergleichen. Hitnet: Keine Zeit bisher. Mehr fällt mir gerade nicht ein. Ciao, -- Carsten Otto c-otto(a)gmx.de www.c-otto.de

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