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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If you are concerned about side-effects of altering lease time
and your scopes happen to have a lot of spare addresses, you could do it with
exclusions instead. E.g. for a /24 subnet with 100 phones you could exclude
.128-.254 on the old server, wait for all phones to get leases below .128, switch
to the new server and exclude .1-.127 on it, wait for all phones to get leases
above .127 and then remove the exclusion.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>-- <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Mike Norton<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I.T. Support<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Peace Wapiti School Division No. 76<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Helpdesk: 780-831-3080<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Direct: 780-831-3076<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US 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>Lelio Fulgenzi<br>
<b>Sent:</b> September-17-09 2:51 PM<br>
<b>To:</b> cisco-voip voyp list<br>
<b>Subject:</b> [cisco-voip] DHCP Migration Strategy - RFC<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>So, I'm planning on moving the DHCP service off a CallManager
subscriber to our central DHCP service. Past experience tells me that this
shouldn't be too much of an issue, but there are some things to look out for.
For example, IP address conflicts on phones causes both phones to reset.<br>
<br>
Here's what I'm planning on doing (testing out on one scope to begin with):<o:p></o:p></span></p>
<ol start=1 type=1>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Lower lease time on CallManager subscriber DHCP
server from 8 days to 1 hour. Wait until all phones have a 1 hour lease.<o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Change IP helper address on interface to new DHCP
server.<o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Deactivate scope on CallManager subscriber DHCP
server.<o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Wait one hour until all phones have new lease on
new DHCP server and all IP address conflicts are resolved.<o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Remotely reset phones that are not co-operating.<o:p></o:p></span></li>
</ol>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>Two questions:<o:p></o:p></span></p>
<ul type=disc>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l0 level1 lfo2'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Is having a 1 hour lease time on the subscriber an
issue? It's a 7835 from about 4 years ago and it does nothing else other
than DHCP/TFTP.<o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l0 level1 lfo2'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Can I go a step further and lower the lease time
to 30min or even 15 min without significant concern?<o:p></o:p></span></li>
</ul>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'>We have about 7500 phones.<br>
---<br>
Lelio Fulgenzi, B.A.<br>
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>
"Bad grammar makes me [sic]" - Tshirt<o:p></o:p></span></p>
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