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depending on your nw topology this could still be a problem:<br>
CSCso60222 After DHCP Monitor service is stopped, IP is given to
DHCP clients <br>
<br>
make sure DHCP DISCOVER (and renew as a subset of DISC) will not reach
the CM server.<br>
<br>
Phones tend to go haywire when lease duration goes below something like
5 minutes so I would stay very clear of that on the order of 1 hour. I
don't have the bug for that handy.<br>
<br>
/Wes<br>
<br>
On Thursday, September 17, 2009 4:51:28 PM, Lelio Fulgenzi
<a class="moz-txt-link-rfc2396E" href="mailto:lelio@uoguelph.ca"><lelio@uoguelph.ca></a> wrote:<br>
<blockquote
cite="mid:1301861620.5574611253220688258.JavaMail.root@simcoe.cs.uoguelph.ca"
type="cite">
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<div
style="font-family: Verdana; font-size: 10pt; color: rgb(0, 0, 0);">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):<br>
<ol>
<li>Lower lease time on CallManager subscriber DHCP server from 8
days to 1 hour. Wait until all phones have a 1 hour lease.</li>
<li>Change IP helper address on interface to new DHCP server.</li>
<li>Deactivate scope on CallManager subscriber DHCP server.<br>
</li>
<li>Wait one hour until all phones have new lease on new DHCP
server and all IP address conflicts are resolved.<br>
</li>
<li>Remotely reset phones that are not co-operating.</li>
</ol>
Two questions:<br>
<ul>
<li>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.</li>
<li>Can I go a step further and lower the lease time to 30min or
even 15 min without significant concern?</li>
</ul>
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<br>
<br>
</div>
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