[e-nsp] Summit450X - strange IGMP-snooping on port connected to Linux server?

Thu Sep 18 09:22:11 EDT 2008

Hi,
My Linux server is running JBoss and I see some IGMP-join packages to going to 224.0.0.75 and 228.30.4.76 when starting up. 

It might be those packets that causes the problem. But I do not understand how they can make the 450X think that the server is a router or making the IGMP-snooping funcionality stop working...

Best Regards
/// Fredrik

> Date: Wed, 17 Sep 2008 15:10:10 +0530> From: shankarp5 at gmail.com> To: extreme-nsp at puck.nether.net> Subject: Re: [e-nsp] Summit450X - strange IGMP-snooping on port connected to Linux server?> > Hey> > Check if the server is sending out any control protocol or routing> protocols or any other packet that you expect only a router to send. I> really dont know the list, but as you suggested there are few protocol> packets, observing which the L2 box assumes that there is a router on> the other end....> > regards,> shankar> > > On Tue, Sep 16, 2008 at 6:24 PM, F J <ripprapp at hotmail.com> wrote:> > Hi,> > I am running a Juniper M10 as Multicast router in my network. It> > automatically becomes the DR of the "VLAN" as the Linux server is situated> > on. I also have other Linux servers on that switch in the same VLAN and> > IGMP-snooping is working for them.> >> > They are running RedHat and not Suse though. They are not listed as "Router"> > by the Summit450X.> >> > When doing a tcpdump on my Linux server I do not see any traffic going to> > 224.0.0.2 (all routers) so I don't understand why the switch lists that> > Linux as a router. Really strange...> >> > BR> > /// Fredrik> >> >> >> > ________________________________> > From: MLouis at nwnit.com> > To: fabian.extr at gmail.com; extreme-nsp at puck.nether.net> > Date: Tue, 16 Sep 2008 08:10:44 -0400> > Subject: Re: [e-nsp] Summit450X - strange IGMP-snooping on port connected to> > Linux server?> >> > In my experience, IGMP snooping will not work unless the layer 2 switch> > snoops the client report. Meaning you have to have clients who want to join> > a group sending IGMP join reports that the switch can snoop. This usually> > requires that something be performing the quierier process, ie a multicast> > enabled router. 224.0.0.2 is all routers MC address. Enable PIM on the> > router and see if IGMP snooping works.> > ________________________________> > From: extreme-nsp-bounces at puck.nether.net> > [extreme-nsp-bounces at puck.nether.net] On Behalf Of Fabian> > [fabian.extr at gmail.com]> > Sent: Tuesday, September 16, 2008 7:28 AM> > To: extreme-nsp at puck.nether.net> > Subject: Re: [e-nsp] Summit450X - strange IGMP-snooping on port connected to> > Linux server?> >> > Hi Frederik,> >> >> >> > If your server is considered as a Router, that means that it is advertising> > on multicast address : 224.0.0.2> >> >> >> > So do a TCPDUMP to check if so and verify if you don't have a router feature> > enabled.> >> >> >> > Regards, Fabian.> >> >> >> > From: extreme-nsp-bounces at puck.nether.net> > [mailto:extreme-nsp-bounces at puck.nether.net] On Behalf Of F J> > Sent: mardi 16 septembre 2008 12:26> > To: extreme-nsp at puck.nether.net> > Subject: Re: [e-nsp] Summit450X - strange IGMP-snooping on port connected to> > Linux server?> >> >> >> > Hi,> > Thanks for your answer. But isn't the BCR and CBSR config only important if> > you are running the Switch in layer3?> >> > I am only using it as a layer2 switch.> >> > I still think that it is strange that the switch is considering this server> > as being> > a "router" when running the show commands. There must be some critera for> > the switch to do that or?> >> > More info about this Linux server:> > My Linux server is running JBoss and I see some IGMP-join packages to going> > to> > 224.0.0.75 and 228.30.4.76 when starting up.> >> > Best Regards> > /// Fredrik> >> >> >> >> >> > ________________________________> >> > Date: Tue, 16 Sep 2008 11:52:02 +0300> > From: napstertash at gmail.com> > To: ripprapp at hotmail.com> > Subject: Re: [e-nsp] Summit450X - strange IGMP-snooping on port connected to> > Linux server?> > CC: extreme-nsp at puck.nether.net> >> > Hello FJ,> >> > On Tue, Sep 16, 2008 at 8:21 AM, F J <ripprapp at hotmail.com> wrote:> >> > Hi,> > I am using a Summit450X as a layer2 switch in my multicast network.> > I am using PIM SM on my routers and I am running IGMP snooping on my layer2> > switches.> >> > On this 450X-switch I have a HP server runnning Linux connected to port 21.> >> > When running some show commands (see below) it looks like the switch thinks> > that the> > server is a router? And that it should get all Multicast streams?> >> >> >> > You might have to play a lot more with the priorities so you figure this> > out, I would think.> >> >> >> > Can anyone explain what is causing this?> >> >> >> > I think the answer might be between the configuration settings you have got> > for both the BSR and CBSR.> >> >> >> > Is my switch misconfigured or is my server doing something strange?> > What is the criteria for being listed as a router by the switch?> >> > Port 45 is connected to the closest router.> >> > Any ideas of what could be causing this kind of behaviour is appreciated!> >> >> >> > If you don't want this box to participate the the multicast traffic then I> > would suggest you remove that port form the selected list, OR make the> > specified port that you want to be the BSR by using the priorities.> >> >> >> > Hope it helps.> >> >> >> > Regards> >> >> >> > Best Regards> > Fredrik> >> > X450a-48tdc.19 # sh igmp snooping> > Vlan Vid Port #Senders #Receivers Router Enable> > --------------------------------------------------------------> > SN102 164 6 Yes> > 19 2 No> > 20 5 No> > 21 3 Yes> > 45 0 Yes> >> > VLAN SN102 (164) Snooping=Enabled> > Group Sender Age> > 239.1.1.1 10.21.65.5 14> > 239.1.1.2 10.21.65.5 10> > 228.0.198.75 10.21.64.4 25> > 228.0.198.76 10.21.64.4 13> > 228.0.198.77 10.21.64.4 13> > 5 Incoming multicast streams> >> > Port Host Subscribed Age> > 19 10.21.64.2 225.10.10.10 66> > 19 10.21.64.2 226.10.10.10 63> > 20 10.21.64.3 224.2.127.254 67> > 20 10.21.64.3 224.2.127.255 69> > 20 10.21.64.3 234.5.6.7 63> > 20 10.21.64.3 239.1.1.1 64> > 20 10.21.64.3 239.1.1.2 61> > 21 10.21.64.4 228.0.198.75 68> > 21 10.21.64.4 228.0.198.76 63> > 21 10.21.64.4 228.0.198.77 60> > 21 10.21.64.4 All Groups 69> > 45 10.21.64.1 All Groups 1> >> >> >> >> >> > ________________________________> >> > Connect to the next generation of MSN Messenger Get it now!> >> > ________________________________> >> > Explore the seven wonders of the world Learn more!> >> > _______________________________________________> > extreme-nsp mailing list> > extreme-nsp at puck.nether.net> > https://puck.nether.net/mailman/listinfo/extreme-nsp> >> >> > --> > Ronnie Tash> > ---------> > A: Because we read from top to bottom, left to right.> > Q: Why should i start my reply below the quoted text?> > - -- http://www.i-hate-computers.demon.co.uk/> > ----------------------------------------------> >> >> >> > ________________________________> >> > Connect to the next generation of MSN Messenger Get it now!> >> > ________________________________> > Note: This message and any attachments is intended solely for the use of the> > individual or entity to which it is addressed and may contain information> > that is non-public, proprietary, legally privileged, confidential, and/or> > exempt from disclosure. 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