[cisco-voip] Subscriber and DHCP Servers for Expansion of CUCM Cluster

Wed May 11 18:31:56 EDT 2011

Phone configuration files are updated as configuration changes are 
made.  They are not "one and done" static files.  Thus the need to use 
the TFTP server service on a CUCM node.

For remote sites there is the possibility of doing a TFTP proxy server.  
A local TFTP server receives the phone request and then makes an http 
request to CUCM to retrive the config file. This helps over WAN links as 
HTTP is much more efficient for higher latency links.  This depends on 
features invoked via the "centralized tftp" deployment model of CUCM.  I 
am not aware of a product that has implemented it.  It does not appear 
significantly complicated for good PERL hacker.

Phone---(TFTP)---Proxy---(HTTP)---(WAN)---CUCM TFTP server

The CUCM TFTP server also hosts an HTTP server on an ephemeral port for 
config file retrieval. This was introduced via CSCsb38067. See the 
Release-note in Bug Toolkit for further information.

Regards,
Wes

On 5/11/2011 5:08 PM, Wellnitz, Erick A. wrote:
>
> I believe phone and other device configurations are downloaded via 
> TFTP, therefore must be run on a CUCM server.  In theory you could get 
> the config files and put them on a third party TFTP but I’m not sure 
> how reliable that would be.
>
> *From:*cisco-voip-bounces at puck.nether.net 
> [mailto:cisco-voip-bounces at puck.nether.net] *On Behalf Of *Lelio Fulgenzi
> *Sent:* Wednesday, May 11, 2011 3:33 PM
> *To:* Daniel Martin
> *Cc:* cisco-voip at puck.nether.net
> *Subject:* Re: [cisco-voip] Subscriber and DHCP Servers for Expansion 
> of CUCM Cluster
>
> Yes, TFTP has to run on CUCM as far as I know. Infoblox had some sort 
> of agent working a while ago, not sure if it ever got certification.
>
> We have a dedicated TFTP server for our deployment of almost 8000 
> phones. I think it's a must.
>
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Cooking with unix is easy. You just sed it and forget it.
>                               - LFJ (with apologies to Mr. Popeil)
>
> ------------------------------------------------------------------------
>
> *From: *"Daniel Martin" <daniel.martin at cae.com>
> *To: *"Ryan Ratliff" <rratliff at cisco.com>
> *Cc: *cisco-voip at puck.nether.net
> *Sent: *Wednesday, May 11, 2011 4:28:26 PM
> *Subject: *Re: [cisco-voip] Subscriber and DHCP Servers for Expansion 
> of CUCM Cluster
>
>
> I am running v7.1.3 at this time.
>
> I made an error in the initial post. I wanted to say TFTP and not 
> DHCP. My mistake.
>
> Cisco is telling me that the TFTP service has to run on a CUCM server. 
> Is that correct?
>
> Do you have dedicated TFTP servers or having that function off the 
> same subscribers used for Call Agent process? This is for up 7000 phones.
>
> Daniel.
>
> *From:*Ryan Ratliff [mailto:rratliff at cisco.com]
> *Sent:* Wednesday, May 11, 2011 12:14 PM
> *To:* Daniel Martin
> *Cc:* cisco-voip at puck.nether.net
> *Subject:* Re: [cisco-voip] Subscriber and DHCP Servers for Expansion 
> of CUCM Cluster
>
> What CUCM version are you on now and is an upgrade involved as part of 
> this?
>
> -Ryan
>
> On May 11, 2011, at 11:49 AM, Daniel Martin wrote:
>
> Hi,
>
> I would like to get the community's feedback on Subscribers and DHCP 
> Servers setup for a cluster of 6000-7000 phones. We currently have 
> about 2000 phones running off two 7835 subscribers which are also the 
> DHCP servers. The 7835 are old and must be replaced. We will be adding 
> between 4000-5000 IP phones in the next 12-24 months for a total of 
> about 6000. With softphone and mobility, that will go close to 7500 
> devices I project long term.
>
> The cluster is located in the headquarters within multiple computer rooms.
>
> What would be the recommended architecture for subscribers?
>
> - Currently looking at having 3 x 7845 for Subs
>
> - 2 CCM Groups to have all phones split 50-50
>
>                 CUCM Group1                   CUCM Group2
>
>                 Sub A                                    Sub B
>
>                 Sub B                                     Sub A
>
>                 Sub C                                     Sub C
>
> What would be the recommended setup for DHCP service?
>
> - Currently looking at having Sub C be the primary DHCP Server and 
> have one of the other Subs as backup DHCP Server
>
> As per Cisco Sales Support, I need two Mobility servers as well. Are 
> other people using these? Recommendations?
>
> Any feedback would be much appreciated.
>
> Daniel.
>
> Daniel Martin
>
> Chef de Groupe – Gestion du Réseau des TI
>
> Group Leader – IT Network Management
>
> CAE Inc.
>
> St-Laurent, Québec Canada
>
> H4T 1G6
>
> Tél:  1-514-341-2000 x4878
>
> Fax: 1-514-340-5489
>
> daniel.martin at cae.com <mailto:daniel.martin at cae.com>
>
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