[cisco-voip] DHCP Migration Strategy - RFC

Thu Sep 17 17:44:11 EDT 2009

It's been a really long time ago, but has anyone had issue with short lease
times.  Doesn't the phone blip every time it gets a new IP?  IF memory
serves me correct I had calls cutting out when the phones grabbed a new IP.
 Was that just a Firmware load I had at the time?
Scott

On Thu, Sep 17, 2009 at 2:39 PM, Lelio Fulgenzi <lelio at uoguelph.ca> wrote:

> sweet! thanks.
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "Bad grammar makes me [sic]" - Tshirt
>
>
> ----- Original Message -----
> From: "Matthew Loraditch" <MLoraditch at heliontechnologies.com>
> To: "Lelio Fulgenzi" <lelio at uoguelph.ca>
> Cc: "cisco-voip voyp list" <cisco-voip at puck.nether.net>, "Jason Fuermann"
> <JBF005 at shsu.edu>
> Sent: Thursday, September 17, 2009 5:36:34 PM GMT -05:00 US/Canada Eastern
> Subject: RE: [cisco-voip] DHCP Migration Strategy - RFC
>
>  Go Google: http://www.infoblox.com/import/
>
> I just look at the parts of the wizard I could get to w/o an infoblox and
> it says you can, albeit looks like you have to do the whole server from the
> included instructions not sure if that would mess you up or not
>
>
>
>
>
> *Matthew Loraditch*
> 1965 Greenspring Drive
>
> Timonium, MD 21093
> support at heliontechnologies.com
> (p) (410) 252-8830
> (F) (443) 541-1593
>
> Visit us at www.heliontechnologies.com
> Support Issue? Email support at heliontechnologies.com for fast assistance!
>
>
>
> *From:* Lelio Fulgenzi [mailto:lelio at uoguelph.ca]
> *Sent:* Thursday, September 17, 2009 5:32 PM
> *To:* Matthew Loraditch
> *Cc:* cisco-voip voyp list; Jason Fuermann
> *Subject:* Re: [cisco-voip] DHCP Migration Strategy - RFC
>
>
>
> Central DHCP server is InfoBlox. I'll have to see if they can import a
> Windows DHCP export file.
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "Bad grammar makes me [sic]" - Tshirt
>
>
> ----- Original Message -----
> From: "Matthew Loraditch" <MLoraditch at heliontechnologies.com>
> To: "Lelio Fulgenzi" <lelio at uoguelph.ca>, "Jason Fuermann" <
> JBF005 at shsu.edu>
> Cc: "cisco-voip voyp list" <cisco-voip at puck.nether.net>
> Sent: Thursday, September 17, 2009 5:27:51 PM GMT -05:00 US/Canada Eastern
> Subject: RE: [cisco-voip] DHCP Migration Strategy - RFC
>
> Is your central DHCP server windows as well? If so you can migrate the
> Scope, I’ve done it many times, shut down current dhcp server, export to
> file, copy file to new server, import and activate it and update ip helper,
>  can be done in 5 to 10 minutes.  all current leases and all other settings
> related to the scope come over. You can do it scope by scope or the whole
> server at the same time.
>
>
>
>
>
> *Matthew Loraditch*
> 1965 Greenspring Drive
>
> Timonium, MD 21093
> support at heliontechnologies.com
> (p) (410) 252-8830
> (F) (443) 541-1593
>
> Visit us at www.heliontechnologies.com
> Support Issue? Email support at heliontechnologies.com for fast assistance!
>
>
>
> *From:* cisco-voip-bounces at puck.nether.net [mailto:
> cisco-voip-bounces at puck.nether.net] *On Behalf Of *Lelio Fulgenzi
> *Sent:* Thursday, September 17, 2009 5:23 PM
> *To:* Jason Fuermann
> *Cc:* cisco-voip voyp list
> *Subject:* Re: [cisco-voip] DHCP Migration Strategy - RFC
>
>
>
> Good catch - I'll see if the new server can do a ping or something first,
> and what ACLs we have to open to allow that.
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "Bad grammar makes me [sic]" - Tshirt
>
>
> ----- Original Message -----
> From: "Jason Fuermann" <JBF005 at shsu.edu>
> To: "Wes Sisk" <wsisk at cisco.com>, "Lelio Fulgenzi" <lelio at uoguelph.ca>
> Cc: "cisco-voip voyp list" <cisco-voip at puck.nether.net>
> Sent: Thursday, September 17, 2009 5:18:35 PM GMT -05:00 US/Canada Eastern
> Subject: RE: [cisco-voip] DHCP Migration Strategy - RFC
>
> If I remember correctly we’ve had leases set to 30 minutes before without
> any issues. I wouldn’t go below that because the phone is going to be
> renewing at a 15 minute interval. I’d check on what DHCP server you’re
> using, some will check if an address is in use before issuing one (at least
> I’ve experienced that on windows DHCP), and on that same note, make sure
> there is enough overlap in the scopes so you don’t run out of leases due to
> addresses being blocked for conflicts.
>
>
>
> *From:* cisco-voip-bounces at puck.nether.net [mailto:
> cisco-voip-bounces at puck.nether.net] *On Behalf Of *Wes Sisk
> *Sent:* Thursday, September 17, 2009 4:03 PM
> *To:* Lelio Fulgenzi
> *Cc:* cisco-voip voyp list
> *Subject:* Re: [cisco-voip] DHCP Migration Strategy - RFC
>
>
>
> depending on your nw topology this could still be a problem:
> CSCso60222    After DHCP Monitor service is stopped, IP is given to DHCP
> clients
>
> make sure DHCP DISCOVER (and renew as a subset of DISC) will not reach the
> CM server.
>
> 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.
>
> /Wes
>
> On Thursday, September 17, 2009 4:51:28 PM, Lelio Fulgenzi
> <lelio at uoguelph.ca> <lelio at uoguelph.ca> wrote:
>
> 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.
>
> Here's what I'm planning on doing (testing out on one scope to begin with):
>
>    1. Lower lease time on CallManager subscriber DHCP server from 8 days
>    to 1 hour. Wait until all phones have a 1 hour lease.
>    2. Change IP helper address on interface to new DHCP server.
>    3. Deactivate scope on CallManager subscriber DHCP server.
>    4. Wait one hour until all phones have new lease on new DHCP server and
>    all IP address conflicts are resolved.
>    5. Remotely reset phones that are not co-operating.
>
> Two questions:
>
>    - 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.
>    - Can I go a step further and lower the lease time to 30min or even 15
>    min without significant concern?
>
> We have about 7500 phones.
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "Bad grammar makes me [sic]" - Tshirt
>
>
>
>
>
>
>
>
> ------------------------------
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