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Configuring a DVMRP tunnel

Posted on 2002-03-19
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Last Modified: 2009-12-16
Can anyone tell me how to forward multicast traffic to a specific subnet or host using a DVMRP tunnel?  I can't seem to get decent documentation on this -basically I need configuration help from someone who knows how to do it.
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Question by:Silas
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by:scraig84
ID: 6880459
Have you looked at something like this:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcpt3/1cfdvmrp.htm#xtocid0

Writing full how-to's are difficult - so this is a good starter document.  If you have specific problems, let us know.
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by:AsenathWaite
ID: 6882605
scraig84,

I looked at this article, but it amounts to a command list, rather than an explanation of how and what DVMRP tunnels do.  I want to send multicast traffic from a server to a remote subnet through a network that does not support multicast routing.  How can I set (basics) up a tunnel to do this?
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by:scraig84
ID: 6882633
AsenathWaite - that is a completely different question.  The fact that Silas is needing to work with DVMRP implies that he is trying to integrate with an existing multicast environment.  This is because Cisco only interoperates with DVMRP and does not support it directly.  I have worked with Silas enough to know that he is in a Cisco environment - (not to mention that you don't tunnel through DVMRP in an all DVMRP environment - tunneling implies there is not full compatibility).

If you've literally never done it, my recommendation would be to go to Cisco's site and do a search on "multicast" and start reading up.  There is enough about it that there really isn't a simple "how-to" - there's too many different ways to do it.
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Author Comment

by:Silas
ID: 6883024
I'll try to be a little more specific.  I inherited a scenario in which someone was trying to build a dvmrp tunnel between 2 Cisco routers.  According to the documentation, I need to use "tunnel mode gre" for this, set up my tunnel interfaces, my source and destination points, and enable mutlicast routing.  Here is what I am unclear about

1. Does the RP in this scenario need to be one of the routers with a tunnel configured?
2. The server that is generating multicast traffic, does it need to be directly connected to one of these routers.  If not, does each router in this system need to be running PIM?
3. If I build an access-list on an interface and do a permit ip... does that include PIM?  Or do I need a separate line permitting PIM?

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scraig84 earned 45 total points
ID: 6883314
1) No - at least I have never heard of this requirement and I can't think of any reason this would be a necessity.

2) A router on the segment of the server would need to be configured to forward multicast traffic or it would die at the router (similar to a broadcast).  Technically not all routers would need to run PIM - but a router that is not configured for multicast will not forward it, so you need to make sure that there are multicast pathways to every destination.

3) Good question - I would definitely think so but I haven't done a trace on it that I can remember so I can't be sure.  I would get it working between two neighbors and then put an access list on one that allows all IP and see if anything happens - or you could watch the interaction with a sniffer.  Other than that I would be about 98% sure it is strictly IP based.

I hope that helps.  Sorry if my answers are somewhat vague - its been a while since I have had to set up anything multicast.
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by:Silas
ID: 6885662
thanks for the help
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