12-07-2007 08:32 AM - edited 03-03-2019 07:50 PM
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
12-07-2007 08:52 AM
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
12-07-2007 09:03 AM
I'm affraid that c850-advsecurityk9-mz.124-15.T1 doesn't have ip pim at all.
How does ip igmp snooping help with multicast routing? Of course, ip multicast-routing is enabled in global config.
12-07-2007 09:10 AM
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
HTH
Narayan
12-07-2007 09:53 AM
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 :(
12-07-2007 10:42 AM
Victor,
IGMP is automatically enabled when you configure PIM on the interface.
ip pim sparse-mode
Regards,
12-07-2007 12:38 PM
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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