I want to relay my multicast from one location to another location, we have an IP based network between these two locations having several routers in between them, so instead of enabling multicast routing on all the devices I have created a GRE tunnel between these two locations and the pim dense mode is enabled on GRE tunnel and it works fine. I am able to receive voice and video perfectly on the receivers end.
But now i want to keep my global routing and the multicast traffic seperate in new location and hence I have created a vrf-lite on the router and placed tunnel and local interface in this vrf, but after placing this in vrf, i am unable to receive voice and video on my receivers end.Kindly note i can see the source IP of multicast on my routers, this means no issue with multicast configuration. Do i have to add any other parameters when i am trying to run multicast in vrf-lite. Please help.
Reverse path forwarding is in place. By giving sh ip mroute vrf i can see the mroute for the source. I can join the multicast group from my device but i cant hear voice and see video from my device when the GRE tunnels are placed in VRF, and once I remove the tunnels from VRF I get voice and video. I am using pim-dense mode is that creating any issue coz i have seen few exapmles and they have given it by sparse-dense mode.
"An interface configured in sparse-dense mode is treated in either sparse mode or dense mode of operation, depending on the mode in which the multicast group operates. You must decide how to configure your interfaces."
Also, I understand there are some restriction on multicast over a VRF, specifically with the dense mode. Take a look to:
You need to enable Mcast routing for the VRF in question. This is required for enabling multicast routing for the vrf apart from globally which i believe is already done.
You source and destination of the multicast leg need to be reachable in the VRF routing table and not the global routing table.
Verify this in the routing table of the vrf.
Looking at it from a overall perspective,rather than using the vrf lite, you can simply use a GRE tunnel between the end points to avoid enabling mcast all over the network. AS with the vrf lite you would be hairpinning global table into the vrf table to make it work.
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