RE: Multicast Question

From: Mark Stephanus Chandra (mark.chandra@gmail.com)
Date: Mon Aug 25 2008 - 23:55:00 ART

So,

In My case below, R1 route multicast via tunnel using ip mroute static right
?

And How R4 going back to the to R1 (client) ? Is going back through unicast
routing table right ? So it is not going via tunnel. Is this going to be RPF
Failure ?

Regards

Mark Stephanus Chandra

-----Original Message-----
From: Huan Pham [mailto:Huan.Pham@peopletelecom.com.au]
Sent: Tuesday, August 26, 2008 9:06 AM
To: Mark Stephanus Chandra; ccielab@groupstudy.com
Subject: RE: Multicast Question

Hi Mark

Yeah, ping echo reply is unicast.

But the bigger issue is you mix up the use of static multicast "ip
mroute" and normal static route in general.

Static multicast route is to fix RPF failure issue. It is not made to
route multicast traffic! In most cases, you do not even need to have ip
mroute (NOT "always perform on client attached router" as you mentioned
if you do not have RPF issue)!

Cheers,

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Mark Stephanus Chandra
Sent: Tuesday, 26 August 2008 11:19 AM
To: ccielab@groupstudy.com
Subject: Multicast Question

Guys,

I have a simple question about multicast. I'm wondering why ip multicast
route static always perform on client attached router and no ip
multicast route static to come back from the source ?

like these example of question :

Multicast Source -------- R4
-----------R3--------------R1-------Multicast
Client

Connection between R4 - R3 - R1 happen to be frame-relay, so it is a
hub and spoke topology with R3 as the hub.

The solution is create tunnel between R4 and R1 using ip mroute to
multcast source on R1 with Tunnel interface as the gateway and there is
no ip multicast static route to go back to multicast client.

The Question is How R4 going back to R1 ? Using unicast routing table ?

If Yes then it's not going back using the interface tunnel right ? so it
is not a symectric routing solution.

 Hope you guys know what I meant

Thanks a lot 

--
Mark Stephanus Chandra

Blogs and organic groups at http://www.ccie.net

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