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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">You don’t need root access to look at the arp table. Just issue
<b>utils network arp list</b> on your CUCM servers (specifically the sub in question) via CLI and make sure you aren’t at the 1024 entry limit. As Jason indicated you don’t want your phones in the same vlan as your voice servers.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">From the install guide:</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt; font-family:"Times-Roman","serif"">Do not install Cisco Unified Communications Manager in a large Class A or Class B subnet that contains a large number of devices. When you install
Cisco Unified Communications Manager in a large subnet with a large number devices in that subnet, the Address Resolution Protocol (ARP) table can fill up quickly (maximum 1024 entries, by default). When the ARP table gets full, Cisco Unified Communications
Manager can have difficulty talking to endpoints and cannot add more phones.</span><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thanks,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Kevin</span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net]
<b>On Behalf Of </b>Jason Aarons (AM)<br>
<b>Sent:</b> Tuesday, July 26, 2011 6:40 PM<br>
<b>To:</b> Hefin James [ahj]; 'cisco-voip@puck.nether.net'<br>
<b>Subject:</b> Re: [cisco-voip] CUCM 8.5.1(SU1) arp problem</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">You can run a snoop (via network capture) on the CLI of the sub to confirm your not replying with arp.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">You don’t have phones on same vlan as sub right, routing correct? The arp table on CallManager/Appliance is limited.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Have TAC root in and look at arp table, etc. help you with the capture via cli.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Jason Aarons</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Consultant</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Dimension Data</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">904-338-3245 mobile</span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net]
<b>On Behalf Of </b>Hefin James [ahj]<br>
<b>Sent:</b> Tuesday, July 26, 2011 5:37 PM<br>
<b>To:</b> 'cisco-voip@puck.nether.net'<br>
<b>Subject:</b> [cisco-voip] CUCM 8.5.1(SU1) arp problem</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal"><br>
<br>
We've just started to experience problems with one of our subscribers in our 4 way cluster.<br>
After some investigations, I connected a laptop to the voice vlan, and a ping doesn't get a reply, looks like the sub in question ignores arp requests, and phones have problems connecting to it.<br>
The sub has well over 800 phones connected to it from a cluster total of 1250 (and growing), so it's way off it's capacity<br>
<br>
Does anybody have any pointers?<br>
<br>
Thanks,<br>
Hefin<br>
<br>
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<br>
<span style="color:white">itevomcid</span> </p>
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