IGMP config - how to?

[Mutex]

Hello!

Can anyone explain how to configure my switches correctly to get IGMP working correctly in VLAN1? See attached picture.

Used equipment are two 2910al and two 2610al switches.

When I turn on IGMP in the webinterface for VLAN1 on every switch multicast traffic doesn't go through.

Do I have to configure the switches with the CLI? If yes can anyone show me how.

Thanks in advance Harald

[Natasha Samoylenko]

A Querier is required for proper IGMP operation. So you need IP address at least on one switch in VLAN 1.

In CLI you need to enable IGMP in VLAN 1 on every switch:
switch(config)# vlan 1 ip igmp

You can check if IGMP is enabled after you configured it in the webinterface or CLI:
show ip igmp config
show ip igmp

The source and client in common subnet, so you don't need any aditional steps.

[Mohammed Faiz]

Hi,

It's easier to confirm that things are working as expected via the CLI, so what you can do is this:

on each switch -

switch# show ip igmp 1

That should tell you if IGMP is enabled on VLAN 1. If it isn't you need to run (on each switch)

switch# conf t
switch(config)# vlan 1 ip igmp

Then to determine whether your switches are seeing any multicast traffic run the first command again

switch# sh ip igmp 1

which should give you an output similar to:

VLAN ID : 1
VLAN Name : VLAN1
Querier Address : No Querier detected yet

Active Group Addresses Reports Queries Querier Access Port
---------------------- ------- ------- -------------------
224.0.1.60 280 0
224.0.1.127 12 0

[Mutex]

Hi!

Which switch should be the querier? Is there any rule?

And how do I set up an IP for that Switch in VLAN1.

Thanks for your Help!

[Natasha Samoylenko · Accepted solution]

Generally it should work without querier, as I remember, but maybe this is the issue why it don't.
To configure IP in VLAN 1:
switch(config)# vlan 1 ip address x.x.x.x/xx

In your network topology this can be any switch.

[Natasha Samoylenko]

And also it is good to check if you can ping streaming server from streaming client.

[Mutex]

Hi!

Unicast traffic is no problem! Ping and everthing else like http work without problems. Only multicast makes problems in this configuration.
Just for Info: See attachemt -> Config of the first 2910 (where the streaming server is connected)
moreover: default_Vlan has id 1 and the VLAN1 of my schematic diagram is called Tripleplay and has id 3.

[Natasha Samoylenko]

I'm a little confused about VLAN 1 and VLAN 3 in your topology.

You have all devices in VLAN 3?
They all in general subnet? Is the streaming server and clients in general subnet?

If all devices in VLAN 3, then you need to configure IGMP in this VLAN.

From show command its looks like clients send IGMP report to server.

[Mutex]

Sorry for confusing! Now I have corrected the names and ids -> see attachment!

Yes I have my multicast Clients and the streaming Server in VLAN 3 (Tripleplay).
This devices are only in VLAN 3!

Here I have made a flickr set where I post my screenshots: http://www.flickr.com/photos/weillechner/sets/72157625017882781/with/5071547898/

[Natasha Samoylenko]

In your topology switches are connected with ports labeled as ports in VLAN 1.
May be this port also tagged in VLAN 3?
How streaming server and clients see each other?

You can also try to connect streaming client and server to the same switch. In this way you can test is this a switch to switch issue or may be some multicast streaming software issue.