IGMP Snooping Not Working [WS-6-MINI]

[uberdome]

You need to assign the VLAN an IP address (in the subnet the clients are using) if you are going to enable the querier on it, otherwise it will use the management IP address as you saw.

I wouldn't have thought you would need to enable the querier, since you are doing multicast surely you already have a multicast router on the network.

I did not previously understand this. I thought the "querier" option on each VLAN just represented whether that VLAN would try to identify a querier on that VLAN to run snooping or not.

So, I just disabled the querier. but left everything else the same. I tested, then rebooted, then tested again for good measure.

Now, the "IGMP Snooping" tab shows the correct Active Querier IP for VLAN 104, but it states that it is idle.

It still shows the subscribed Group Addresses. It does not, however, pass any multicast traffic.

[Eric Stern]

It always tries to identify the querier if IGMP snooping is enabled, its the only way it can work. It listens in (snoops) on the message exchanged (join/leave) between the clients and the multicast router so it knows which ports to associate to specific multicast groups.

The querier VLAN option and the "Querier State" refer to the internal querier (ie multicast router) on the switch, which you would only need to use if you didn't already have a multicast router on your network.

"Active Querier" shows which querier is currently in charge. If the internal querier is enabled then it might be internal querier, but it might not be. If there are multiple queriers on the same IP subnet then they decide amongst themselves which one is going to be in charge. All the others go idle.

I'll do some more testing.

[Eric Stern]

Found a problem with VLANs. You can try 1.5.2rc2.

[uberdome]

Flashing now, will let you know the results.

[uberdome]

Found a problem with VLANs. You can try 1.5.2rc2.

I'm testing it now. It is recognizing and passing multicast streams now, but still drops the streams in my test.

Monitoring one of my ports for the past 5 minutes, it drops the multicast stream every ~40 seconds (timings ranged from 35 seconds up to 60 seconds). Stream kicks back on after about 5 seconds every time.

In the IGMP Snooping tab, I don't see the Group Address dropping or anything like that, but it may not update fast enough to notice.

[Eric Stern]

I can't reproduce this. I'm using VLC as streaming server and client, seems solid.

Can you try this? Note that this is only safe to do via the serial console. This will create a debug log that I can examine.
Commands from the CLI:

Code: Select all

 
cmd
/etc/init.d/vtss_appl stop
vtss_appl -l -m -s -a -i -v 4 > /tmp/debug.log


Let it run for about 30 seconds to start up, then start your stream and let it run until the stream drops and restarts, then hit CTRL-C then run this command

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/etc/init.d/vtss_appl start


Then you need to get the log file off the switch. If your terminal program supports zmodem you can use "sz /tmp/debug.log". If you have network access to the switch you can use scp or tftp. Or if your terminal has a large enough scrollback buffer you can use "cat /tmp/debug.log" and then select all the text and copy/paste it to a file.

And then please email the log to me (eric@netonix.com)

Also the contents of /var/log/messages would be helpful too.

[uberdome]

...Note that this is only safe to do via the serial console...

Being a WS-6-MINI, I'm not sure it has a serial console.

[sirhc]

...Note that this is only safe to do via the serial console...

Being a WS-6-MINI, I'm not sure it has a serial console.

You can access the console under the Device TAB in the web UI

Go to WEB UI Console then drop to linux with the command CMD [Enter]

You can also SSH into the switch with Putty

[uberdome]

...Note that this is only safe to do via the serial console...

Being a WS-6-MINI, I'm not sure it has a serial console.

You can access the console under the Device TAB in the web UI

Go to WEB UI Console then drop to linux with the command CMD [Enter]

You can also SSH into the switch with Putty

Oh, when he said "only safe via the serial console", I read that as "don't use any means other than a physical serial connection".

I'll use SSH as you suggest.

[sirhc]

Hmm, did not see that part Eric wrote.

But since there is no console port that is your only option.

If your doing this in a LAB no risk, if production.......well, your call