IGMP is disabled on interface

Unanswered Question

How can I enable IGMP on an interface?

here is a piece of the config:

ip multicast-routing

!

interface Vlan1

ip address 192.168.1.174 255.255.255.248

no ip proxy-arp

ip tcp adjust-mss 1440

ip igmp proxy-service

fair-queue

!

router#sho ip multicast

Multicast Routing: enabled

Multicast Multipath: disabled

Multicast Route limit: No limit

Multicast Triggered RPF check: disabled

Multicast Fallback group mode: Sparse

Multicast DVMRP Interoperability: disabled

router#sho ip multicast int vlan 1

Vlan1 is up, line protocol is up

Internet address is 192.168.1.174/29

Multicast routing: disabled

Multicast packets in/out: 32/0

Multicast TTL threshold: 0

Multicast Tagswitching: disabled

I have this problem too.
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royalblues Fri, 12/07/2007 - 08:52

Issue the command ip pim spare-dense-mode under the vlan interafces

int vlan 1

ip pim spare-dense-mode

By default igmp snooping is enabled on all interfaces. you can check this using sh ip igmp snooping

Ypu would also need to have the global ip multicast-routing command on the devcie

HTH

Narayan

royalblues Fri, 12/07/2007 - 09:10

Well you nevert mentioned you have a 85X router.

I am not sure whether these routers support multicast but the IOS image mentioned does not show this as a feature in the feature navigator

www.cisco.com/go/fn

HTH

Narayan

I don't know either. It has a complete set of igmp commands as well as ip multicast and mroute for static routes.

and look at it again:

router#sho ip multicast

Multicast Routing: enabled

Multicast Multipath: disabled

Multicast Route limit: No limit

Multicast Triggered RPF check: disabled

Multicast Fallback group mode: Sparse

Multicast DVMRP Interoperability: enabled

It seems that it's already in sparse mode.

I do not understand it :(

Harold Ritter Fri, 12/07/2007 - 10:42

Victor,

IGMP is automatically enabled when you configure PIM on the interface.

ip pim sparse-mode

Regards,

I don't have ip pim.

Is it possible / sensible to build the distribution tree by hands. I'm only interested in one multicast group distributed over 16 cisco851. The router can join it manually by means of ip igmp join-group 234.0.0.1 on the interface I need. Can I possible let others know about this group without pim?

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