<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">CSCtf62463 seems to indicate the 9971 phones don't support DHCP option 35. This will vary by model so YMMV.<div><br><div apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; border-spacing: 0px; ">-Ryan</span>
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<br><div><div>On Oct 8, 2012, at 4:10 AM, <a href="mailto:alalli@iinet.net.au">alalli@iinet.net.au</a> wrote:</div><br class="Apple-interchange-newline"><div style="font-family: 'Helvetica Neue',Helvetica,Arial,sans-serif; font-size: 12px;"><div class="jive-thread-post-body-container">
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<h2><a href="x-msg://184/message/3751318#3751318">Configuring the
ARP cache timeout for Cisco phones</a></h2></div></div>
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<div class="jive-rendered-content"><p>Hi All,</p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p>I am hoping to configure the ARP cache timeout for Cisco phones using the
dhcp option.</p><p>I was wondering if anyone here has done it or can verify that this would be
correct.</p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p>Say for example I have a DHCP pool named VOICE.</p><p>In this network, the CUCM is located at IP address 10.2.200.110 </p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p>I did some google searching and found a Wiki site with the various dhcp
options defined in it.</p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p><a class="jive-link-external-small" href="http://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol">http://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol</a></p><p>According to the site, dhcp option 35 is used as the ARP Cache Timeout value
and it is 4 bytes long.</p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p>Lets say that I would like to set my arp cache timeout to be 300 seconds.</p><p>I convert 300 to hex and get 12C.</p><p>Since my field will need to be four bytes long this becomes 0000.012C.</p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p>I think that the following dhcp pool will provide 300 seconds for the phone
ARP cache timeout.</p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p>ip dhcp pool VOICE</p><p>network 10.240.1.0 255.255.255.0</p><p>default-router 10.240.1.1</p><p>option 150 ip 10.2.200.110</p><p>option 35 hex 0000.0c12 </p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p>Can anyone help me out with a verification or point me in the direction of
the appropiate documentation?</p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p>Many thanks for any assistance.</p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p>Regards</p><div style="padding: 0px; height: 8pt; "> <br class="webkit-block-placeholder"></div><p>Amanda Lalli-Cafini</p></div>
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