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New Member

Multicast over VRF

I had a subinterface that was working fine with multicast as of yesterday. I moved over the configuration to another subinterface, and stopped receiving multicast traffic from the LAN. The router is a 7506. Here is the relevant configuration:

interface FastEthernet4/1/0.113

description Private Subnet

bandwidth 100000

encapsulation dot1Q 113

ip vrf forwarding XXX

ip address 192.168.253.1 255.255.255.0

no ip redirects

no ip unreachables

no ip directed-broadcast

ip pim sparse-dense-mode

ip igmp static-group 239.195.0.0

end

if you do a sh ip mroute vrf XXXX 239.195.0.0- you see traffic going TO that lan- but not seeing traffic coming from it.

Later in the configuration we have bidirectional PIM enabled...

ip pim bidir-enable

ip pim vrf XXXXX rp-address 192.168.36.1

Like I said- all I changed was the subinterface. Any ideas?

  • WAN Routing and Switching
12 REPLIES
Anonymous
N/A

Re: Multicast over VRF

Re: Multicast over VRF

Can you look for DATA MDT (mdt data) or Defualut MDT(mdt default) under your VRF configuration?

as well as check for following stuff:

ip multicast-routing vrf XXX

thanks,

Devang Patel

Cisco Employee

Re: Multicast over VRF

Hi,

Can you post also the sh ip mroute vrf XXX ?

If there is a source transmitting, you should have a (S,G) entry in the vrf mrib

Thanks

Laurent.

New Member

Re: Multicast over VRF

Core-1#sh ip mroute vrf XXXXXX 239.195.0.0

IP Multicast Routing Table

Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,

L - Local, P - Pruned, R - RP-bit set, F - Register flag,

T - SPT-bit set, J - Join SPT, M - MSDP created entry,

X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,

U - URD, I - Received Source Specific Host Report,

Z - Multicast Tunnel, z - MDT-data group sender,

Y - Joined MDT-data group, y - Sending to MDT-data group

V - RD & Vector, v - Vector

Outgoing interface flags: H - Hardware switched, A - Assert winner

Timers: Uptime/Expires

Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 239.195.0.0), 8w3d/00:03:24, RP 192.168.36.1, flags: SJC

Incoming interface: Multilink12, RPF nbr 192.168.252.14

Outgoing interface list:

FastEthernet4/1/0.113, Forward/Sparse-Dense, 19:26:22/00:01:15

Tunnel1, Forward/Sparse-Dense, 8w3d/00:03:24

(10.0.50.254, 239.195.0.0), 4d17h/00:03:29, flags: T

Incoming interface: Tunnel1, RPF nbr 10.255.0.8

Outgoing interface list:

FastEthernet4/1/0.113, Forward/Sparse-Dense, 19:26:22/00:01:15

Multilink12, Forward/Sparse-Dense, 4d17h/00:03:03

(10.0.36.55, 239.195.0.0), 2w0d/00:03:25, flags: T

Incoming interface: Multilink12, RPF nbr 192.168.252.14

Outgoing interface list:

FastEthernet4/1/0.113, Forward/Sparse-Dense, 19:26:22/00:01:15

Tunnel1, Forward/Sparse-Dense, 2w0d/00:03:24

(10.0.36.149, 239.195.0.0), 2w0d/00:03:25, flags: T

Incoming interface: Multilink12, RPF nbr 192.168.252.14

Outgoing interface list:

FastEthernet4/1/0.113, Forward/Sparse-Dense, 19:26:22/00:01:15

Tunnel1, Forward/Sparse-Dense, 2w0d/00:03:24

(10.0.36.254, 239.195.0.0), 6w5d/00:03:25, flags: T

Incoming interface: Multilink12, RPF nbr 192.168.252.14

Outgoing interface list:

FastEthernet4/1/0.113, Forward/Sparse-Dense, 19:26:22/00:01:15

Tunnel1, Forward/Sparse-Dense, 6w5d/00:03:24

We see traffic going toward Fa4/1/0.113, but not coming from it.

Hall of Fame Super Silver

Re: Multicast over VRF

Hello Greg,

out fas4/1/0.113 there is a multicast source or receivers ?

if only receivers what you see is correct and this is a leaf.

Actually the ip pim static-group causes the interface to be in the OILIst for the group.

Hope to help

Giuseppe

New Member

Re: Multicast over VRF

It is both senders and receivers. This was working before- I just had to move to a new fast ethernet interface. We went from fa0/1/0.113 to fa4/1/0.113. The configuration is exactly the same.

Hall of Fame Super Silver

Re: Multicast over VRF

Hello Greg,

just to be sure I suggest a basic check:

can you ping in VRF the supposed sources and receivers from f4/1/0.113 ?

Have you connected it to another L2 switch ? I guess it can be another switch port the one where f4/1/0 is connected.

Hope to help

Giuseppe

New Member

Re: Multicast over VRF

This is an entire production LAN on that port. Multicast traffic is the only thing not passing. I can ping these boxes with a regular ping, but not with a multicast ping.

New Member

Re: Multicast over VRF

This is a layer 2 switch connected to our 7507 router. All we moved was the subinterface- which worked before the move.

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