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New Member

IP Multicast-routing distributed

Hello,

Can I put the statement  "ip multicast-routing distributed" on a workgroup switch if the distribution switch it is immediately downstream from already has the statement?  If I do, will it cause problems?

Thank you in advance.                 

4 REPLIES
Cisco Employee

IP Multicast-routing distributed

Hello Jay,

Configuring the ip multicast-routing distributed alone has no visible effect aside from activating the multicast routing support on this switch. You would need to have some sort of PIM configuration on this switch to actually have effect on the surrounding network.

If there is no other multicast configuration present on your switch, adding the ip multicast-routing distributed command should be safe.

Best regards,

Peter

New Member

IP Multicast-routing distributed

Wow Peter,

Thank you very  much for the quick reply.

The workgroup sw doesn't have any other multicast configs on it other than a "no ip mroute-cache" on the mngmnt vlan.  All the multicast statements are on the distribution sw.

Thank you,

Jay

Cisco Employee

IP Multicast-routing distributed

HI Jay,

You are welcome. I suppose you want this workgroup switch to perform multicast routing itself, correct? If you intend it to simply distribute multicast traffic to end hosts without routing it (i.e. multicast is received in one VLAN and being delivered to other VLANs), you do not need to activate multicast routing on this workgroup switch at all.

Best regards,

Peter

New Member

IP Multicast-routing distributed

Peter,

What is going on is, we have a network that is being migrated from a microwave T1 backbone to a fiber backbone.  It's not a full migration though because of financial and other limitations. 

The original network has an aggregate router here at HQ, and 2 T1 multilinks to the endpoints.  I have 1 site already migrated over to the fiber and the multicasting works.  However, that site has a switch stack with 2 12 port 3750G switches at the top of the stack with 3 3750v2 switches forming the rest of the stack.  The top 2 switches uplink to the router and the 12 port 3750x fiber switch simultaneously.  One port on a v2 sw on the stack is on the VLAN that needs the multicasting and it works.  All I had to do was put "ip pim sparse-dense mode" on all the interfaces on the 3750x at both endpoints that connects through the fiber.  So, I imagine since the multicast statements are actually sitting on the 1st sw in the stack which is the 12 port 3750G, the setup works fine.

However, at one of the most distant sites, it is connected to a workgroup switch that has to be connected to the distribution switch through a channel-group on the uplink ports.  When I turn on the uplink from the fiber sw to the distribution switches, the multicast only works in one direction.

I hope you understand what I just typed :D.

Thank you,

Jay

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