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

Antonio Soares amsoares at netcabo.pt
Wed Jan 28 12:55:20 EST 2015

Enable PIM on the loopback.


Antonio Soares, CCIE #18473 (RS/SP)
amsoares at netcabo.pt

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Lobo
Sent: quarta-feira, 28 de Janeiro de 2015 17:38
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Enabling multicast routing on 3750G platform

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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