[c-nsp] Enabling multicast routing on 3750G platform

Lobo lobotiger at gmail.com
Wed Jan 28 12:37:30 EST 2015

Hi everyone.  I've been trying to get multicast routing to work on a single
3750G switch between two vlans but for the life of me it just doesn't
work.  When the host and receiver are on a single vlan the streaming works
but then you don't even need multicast routing enabled for it to work.
When I split the two hosts onto separate vlans that's where the problem

This is what I've configured so far and I'm sure it's just some extra
commands I'm missing or something:

ip multicast-routing distributed
ip pim rp-address
interface Loopback0
 ip address
interface GigabitEthernet1/0/1
switchport access vlan 100
interface GigabitEthernet1/0/2
switchport access vlan 200
interface Vlan100
ip address
ip pim sparse-dense-mode
interface Vlan200
ip address
ip pim sparse-dense-mode
ip igmp join-group

The server streaming via VLC is and is using for the
multicast address. The receiver is and using VLC to stream.  I can
see the traffic coming in on port 1 but no traffic leaving the switch's
other port.

BTW, I tried dense-mode and sparse-mode as well with similar results.

Any thoughts?


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