shankarp5 at gmail
Sep 17, 2008, 2:40 AM
Post #2 of 2
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Re: Summit450X - strange IGMP-snooping on port connected to Linux server?
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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
>
>
>
>
>
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