What is the simplest way to get IP Multicast working?

[jkeeffe]

I'm using 3560's and 3750 switches at the access layer (L2), and 6509/sup720s for dist & core (L3). I have PIM sparse-dense-mode configed on all L3 ports in the dist/core 6509 routers, with two of those routers config' as RP's. Do I leave everything else on the 6509's at default?

- IP multicast-routing (I turned on)

- MLS IP multicast (on by default)

- IP IGMP (do I turn on snooping or leave this alone?)

I'm not sure what to do on the 3560's or 3750's because there are so many options, but it seems

that IP IGMP Snooping is on by default, but IGMP is not enabled at the vlan:

Vlan230 is up, line protocol is up

Internet address is 164.72.178.145/25

IGMP is disabled on interface

Multicast routing is disabled on interface

Multicast TTL threshold is 0

No multicast groups joined

....so do I enable IGMP at the Vlan?

What about CGMP?

Thanks for any help you can give me to keep this simple.

[Georg Pauwen]

Hello,

by enabling ´ip multicast-routing´ globally, IGMPv2 is enabled on all interfaces (provided that the interface has joined any multicast groups). You can test this by adding a multicats group to the interface:

interface Vlan230

ip igmp join-group 224.1.2.3

The output then changes to something similar to this:

IGMP is enabled on interface

Current IGMP host version is 2

Current IGMP router version is 2

IGMP query interval is 60 seconds

IGMP querier timeout is 120 seconds

IGMP max query response time is 10 seconds

Last member query count is 2

Last member query response interval is 1000 ms

Inbound IGMP access group is not set

IGMP activity: 1 joins, 0 leaves

As with regard to CGMP, it is always a good idea to turn it on on the VLAN interfaces, in order to reduce unnecessary flooding of multicast group traffic.

Does that answer your question ?

Regards,

GP