IP multicast routing redundancy

Unanswered Question
Jun 23rd, 2008

Hi everyone,

I've been trying to deploy a L2/L3 switched based infrastructure that will provide the attached IP multicast fault-tolerant environment.

I have sources on one site multicasting a Video stream over dual Eth/IP ports. Each of these ports is connected to a separate Cisco Catalyst L2 switch (2960) connected via Ethernet transparent WAN links to 2 seperate Cisco L3 switches (3750) at a distant site.

I would like to deploy a fault-tolerant/redundant architecture that avoids loss of video stream in the event of a WAN link failure of Catalyst 2960 failure.

At the destination site, I have deployed a separate vlan for destination devices and run IP multicast routing to forward Video streams to them.

Whether using PIM dense mode or sparse mode, I do not succeed in recovering Video within a few seconds if I fail WAN link #1 or Catalyst 2960 #1. At best, it takes 3minutes to recover and I understand that this is the time it takes for the 3750s to clear the multicast route from its table.

Is there an obvious solution to bypass this issue that I might have missed?

To me the issue is not that of incorrect RP settings (I had auto RP configured on both 3750s using /32 IP addresses on loopback interfaces and it looked Ok), but that of having a fixed DR and a large mroute cache.

Clearly, Catalyst 3750 #1 can re-learn/re-discover Multicast streams via the 3750 interco; the question is how quickly can I get this?

Thanks for any replies.

Rgds,

Hervé

I have this problem too.
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Edison Ortiz Tue, 06/24/2008 - 05:01

Be aware that you are relying on the underlying L3 routing protocol with PIM multicast routing.

It is explained on that document.

HTH,

__

Edison.

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