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<div dir="ltr"><font face="Tahoma" color="#000000" size="2">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.</font></div>
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<font face="Tahoma" size="2"><b>From:</b> extreme-nsp-bounces@puck.nether.net [extreme-nsp-bounces@puck.nether.net] On Behalf Of Fabian [fabian.extr@gmail.com]<br>
<b>Sent:</b> Tuesday, September 16, 2008 7:28 AM<br>
<b>To:</b> extreme-nsp@puck.nether.net<br>
<b>Subject:</b> Re: [e-nsp] Summit450X - strange IGMP-snooping on port connected to Linux server?<br>
</font><br>
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<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Hi Frederik,</span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></span> </p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">If your server is considered as a Router, that means that it is advertising on multicast address :
</span>224.0.0.2<span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></span> </p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">So do a TCPDUMP to check if so and verify if you don’t have a router feature enabled.</span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></span> </p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Regards, Fabian.</span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></span> </p>
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<p class="MsoNormal"><b><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</span></b><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> extreme-nsp-bounces@puck.nether.net [mailto:extreme-nsp-bounces@puck.nether.net]
<b>On Behalf Of </b>F J<br>
<b>Sent:</b> mardi 16 septembre 2008 12:26<br>
<b>To:</b> extreme-nsp@puck.nether.net<br>
<b>Subject:</b> Re: [e-nsp] Summit450X - strange IGMP-snooping on port connected to Linux server?</span></p>
</div>
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<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">Hi,<br>
Thanks for your answer. But isn't the BCR and CBSR config only important if <br>
you are running the Switch in layer3?<br>
<br>
I am only using it as a layer2 switch.<br>
<br>
I still think that it is strange that the switch is considering this server as being<br>
a "router" when running the show commands. There must be some critera for<br>
the switch to do that or? <br>
<br>
More info about this Linux server:<br>
My Linux server is running JBoss and I see some IGMP-join packages to going to<br>
224.0.0.75 and 228.30.4.76 when starting up.<br>
<br>
Best Regards<br>
/// Fredrik<br>
<br>
<br>
<br>
</span></p>
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<p class="MsoNormal" style="MARGIN-BOTTOM: 12pt"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"><br>
Date: Tue, 16 Sep 2008 11:52:02 +0300<br>
From: napstertash@gmail.com<br>
To: ripprapp@hotmail.com<br>
Subject: Re: [e-nsp] Summit450X - strange IGMP-snooping on port connected to Linux server?<br>
CC: extreme-nsp@puck.nether.net<br>
<br>
</span></p>
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<p class="MsoNormal" style="MARGIN-BOTTOM: 12pt"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">Hello FJ,</span></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">On Tue, Sep 16, 2008 at 8:21 AM, F J <<a href="mailto:ripprapp@hotmail.com">ripprapp@hotmail.com</a>> wrote:</span></p>
<div>
<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"><br>
Hi,<br>
I am using a Summit450X as a layer2 switch in my multicast network. <br>
I am using PIM SM on my routers and I am running IGMP snooping on my layer2 switches.<br>
<br>
On this 450X-switch I have a HP server runnning Linux connected to port 21.<br>
<br>
When running some show commands (see below) it looks like the switch thinks that the
<br>
server is a router? And that it should get all Multicast streams? </span></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"></span> </p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">You might have to play a lot more with the priorities so you figure this out, I would think. </span></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"><br>
<br>
Can anyone explain what is causing this? </span></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">I think the answer might be between the configuration settings you have got for both the BSR and CBSR.</span></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"></span> </p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"><br>
Is my switch misconfigured or is my server doing something strange?<br>
What is the criteria for being listed as a router by the switch?<br>
<br>
Port 45 is connected to the closest router.<br>
<br>
Any ideas of what could be causing this kind of behaviour is appreciated!</span></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"></span> </p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">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.</span></p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"></span> </p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">Hope it helps.</span></p>
</div>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"></span> </p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">Regards</span></p>
</div>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"></span> </p>
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<p class="MsoNormal"><span style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"><br>
<br>
Best Regards<br>
Fredrik<br>
<br>
X450a-48tdc.19 # sh igmp snooping <br>
Vlan Vid Port #Senders #Receivers <b>Router </b>Enable<br>
-------------------------------------------------------------- <br>
SN102 164 6 Yes <br>
19 2 No<br>
20 5 No<br>
<b>21 3 Yes</b><br>
45 0 Yes<br>
<br>
VLAN SN102 (164) Snooping=Enabled <br>
Group Sender Age <br>
<a href="http://239.1.1.1/" target="_blank">239.1.1.1</a> <a href="http://10.21.65.5/" target="_blank">
10.21.65.5</a> 14 <br>
<a href="http://239.1.1.2/" target="_blank">239.1.1.2</a> <a href="http://10.21.65.5/" target="_blank">
10.21.65.5</a> 10 <br>
<a href="http://228.0.198.75/" target="_blank">228.0.198.75</a> <a href="http://10.21.64.4/" target="_blank">
10.21.64.4</a> 25 <br>
<a href="http://228.0.198.76/" target="_blank">228.0.198.76</a> <a href="http://10.21.64.4/" target="_blank">
10.21.64.4</a> 13 <br>
<a href="http://228.0.198.77/" target="_blank">228.0.198.77</a> <a href="http://10.21.64.4/" target="_blank">
10.21.64.4</a> 13 <br>
5 Incoming multicast streams <br>
<br>
Port Host Subscribed Age <br>
19 <a href="http://10.21.64.2/" target="_blank">10.21.64.2</a> <a href="http://225.10.10.10/" target="_blank">
225.10.10.10</a> 66 <br>
19 <a href="http://10.21.64.2/" target="_blank">10.21.64.2</a> <a href="http://226.10.10.10/" target="_blank">
226.10.10.10</a> 63 <br>
20 <a href="http://10.21.64.3/" target="_blank">10.21.64.3</a> <a href="http://224.2.127.254/" target="_blank">
224.2.127.254</a> 67 <br>
20 <a href="http://10.21.64.3/" target="_blank">10.21.64.3</a> <a href="http://224.2.127.255/" target="_blank">
224.2.127.255</a> 69 <br>
20 <a href="http://10.21.64.3/" target="_blank">10.21.64.3</a> <a href="http://234.5.6.7/" target="_blank">
234.5.6.7</a> 63 <br>
20 <a href="http://10.21.64.3/" target="_blank">10.21.64.3</a> <a href="http://239.1.1.1/" target="_blank">
239.1.1.1</a> 64 <br>
20 <a href="http://10.21.64.3/" target="_blank">10.21.64.3</a> <a href="http://239.1.1.2/" target="_blank">
239.1.1.2</a> 61 <br>
21 <a href="http://10.21.64.4/" target="_blank">10.21.64.4</a> <a href="http://228.0.198.75/" target="_blank">
228.0.198.75</a> 68 <br>
21 <a href="http://10.21.64.4/" target="_blank">10.21.64.4</a> <a href="http://228.0.198.76/" target="_blank">
228.0.198.76</a> 63 <br>
21 <a href="http://10.21.64.4/" target="_blank">10.21.64.4</a> <a href="http://228.0.198.77/" target="_blank">
228.0.198.77</a> 60 <br>
<b> 21 <a href="http://10.21.64.4/" target="_blank">10.21.64.4</a> All Groups 69
</b><br>
45 <a href="http://10.21.64.1/" target="_blank">10.21.64.1</a> All Groups 1
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