[c-nsp] multicast on transit LAN

Bøvre Jon Harald Jon.Harald.Bovre at hafslund.no
Tue Feb 16 07:47:04 EST 2010

Might not solve your problem but have a look at a MVR vlan.



-----Opprinnelig melding-----
Fra: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] På vegne av Marco Regini
Sendt: 16. februar 2010 12:29
Til: cisco-nsp at puck.nether.net
Emne: [c-nsp] multicast on transit LAN


I 'am in a serious problem with multicast because my distribution ( Cisco Catalyst 3750) and access apparatus ( Cisco Catalyst 3560)  see each over via a common

network ( build on the common vlan 100).  Physically they are in daisy-chain with the gigabit interface, the gigabit are in trunk, all the L3 interface are SVI.


The problem is to limit the multicast traffic on this vlan because at L2 it is like a broadcast. Have you any suggestions?



I read documentation about CGMP,RGMP but on the notes there is written that this stuff works only  when multicast routers are connected via a
L2 switch, and regarding the vlan 100 my cisco are both router ( there is a svi ) and switch.


Another idea is to use IGMP snooping but my multicast receivers/sources are not in this vlan: so no IGMP traffic pass in this vlan.

My last chance is to proxy the IGMP, let me explain:


Receiver --Vlan7-- Fa0/7.Catalyst3560.Gi0/1---Vlan100-Gi0/1.Catalyst3750


If a configure the Catalyst3560 to proxy the igmp join/leave to upstream Catalyst3750 perhaps I give a chance to IGMP snooping to start working on Vlan100.


  Marco Regini


cisco-nsp mailing list  cisco-nsp at puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/

More information about the cisco-nsp mailing list