Re: Multicast routing on a 2610 router

jharper · ‎05-15-2002

I am trying to enable multicast routing on a 2610 router that connects 2 VLAN's. The router only has one ethernet port. IOS 12.0(8)

I have enabled multicast routing globally and igmp on the interface.

Computers on both VLAN's are registering themselves on the router, as seen in show ip igmp groups.

However the multicasts are still not being forwarded.

Is it possible to set this up on a router with only one ethernet port? any suggestions?

DALE FRANCIS · ‎05-15-2002

I assume you are running two subinterfaces, Firstly have you configured PIM sparse or dense mode and if sparse where ir your RP.

Also post a copy of your MROUTE table on this site, that will help us.:))

Also the MROUTE outgoing interface list should not contain an interface where the source is learnt from.

jharper · ‎05-15-2002

Configured in dense mode, no only have one network cable and one ethernet port.

IP Multicast Routing Table

Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned

R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT

X - Proxy Join Timer Running

Timers: Uptime/Expires

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

(*, 239.255.2.2), 00:05:29/00:00:29, RP 0.0.0.0, flags: DP

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list: Null

(*, 239.255.255.252), 03:49:12/00:02:12, RP 0.0.0.0, flags: DJC

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list:

Ethernet0/0, Forward/Dense, 03:49:13/00:00:00

(*, 239.255.255.250), 03:49:18/00:02:08, RP 0.0.0.0, flags: DJC

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list:

Ethernet0/0, Forward/Dense, 03:49:18/00:00:00

(*, 235.80.68.83), 03:49:17/00:02:07, RP 0.0.0.0, flags: DJC

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list:

Ethernet0/0, Forward/Dense, 03:49:31/00:00:00

(*, 224.0.1.40), 03:49:32/00:00:00, RP 0.0.0.0, flags: DJCL

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list:

Ethernet0/0, Forward/Dense, 03:49:32/00:00:00

(*, 224.0.1.60), 03:49:31/00:01:57, RP 0.0.0.0, flags: DJC

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list:

Ethernet0/0, Forward/Dense, 03:49:31/00:00:00

(*, 224.1.1.1), 03:49:30/00:00:00, RP 0.0.0.0, flags: DJCL

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list:

Ethernet0/0, Forward/Dense, 03:49:25/00:00:00

(193.122.16.105, 224.1.1.1), 03:25:20/00:02:59, flags: PCLT

Incoming interface: Ethernet0/0, RPF nbr 0.0.0.0

Outgoing interface list: Null

(*, 224.1.1.2), 03:49:32/00:00:00, RP 0.0.0.0, flags: DJCL

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list:

Ethernet0/0, Forward/Dense, 03:47:04/00:00:00

(193.122.16.105, 224.1.1.2), 03:25:30/00:02:57, flags: PCLT

Incoming interface: Ethernet0/0, RPF nbr 0.0.0.0

Outgoing interface list: Null

(*, 224.0.1.24), 03:49:41/00:02:59, RP 0.0.0.0, flags: DJC

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list:

Ethernet0/0, Forward/Dense, 03:49:41/00:00:00

(193.122.16.90, 224.0.1.24), 00:00:39/00:02:20, flags: PCT

Incoming interface: Ethernet0/0, RPF nbr 0.0.0.0

Outgoing interface list: Null

vpn_router#show ip igmp interface

Ethernet0/0 is up, line protocol is up

Internet address is 193.122.16.80/24

IGMP is enabled on interface

Current IGMP version is 2

CGMP is disabled on interface

IGMP query interval is 60 seconds

IGMP querier timeout is 120 seconds

IGMP max query response time is 10 seconds

Last member query response interval is 1000 ms

Inbound IGMP access group is not set

IGMP activity: 9 joins, 1 leaves

Multicast routing is enabled on interface

Multicast TTL threshold is 0

Multicast designated router (DR) is 193.122.16.80 (this system)

IGMP querying router is 193.122.16.1

Multicast groups joined: 224.0.1.40 224.1.1.2 224.1.1.1

--More--

DALE FRANCIS · ‎05-15-2002

Okay,

All the S.G entries have a null outgoing interface, so that means you have no interested recievers, again the only way i could see this working is trying to get the interface to join the group with "ip igmp join-group xxxx.xxxx.xxxx.xxx", this will force the interface to forward.

I must stress that i do not think this is an ideal situation and the rules of Mcast state that the incoming interface (RPF) must not appear in the OIL (Outgoing Interface List).

the reciept of join for a S,G will automatically create an OIL for *,G by placing the inteface that the S.G was learnt on in the OIL list for a *,G.

jharper · ‎05-15-2002

OK, in that case I think it wont work I have tried joinging the groups previously with no joy, I will have to see if I can get another ethernet module.

Thanks

DALE FRANCIS · ‎05-15-2002

Unless you can get and trunking module ISL etc.

How are you linking the two VLAN's together..??? via BVI interface or secondary addressing..???