[cisco-voip] DHCP Behavior

[Lelio Fulgenzi]

I would set the lease time to about 2 minutes for a migration like this.

Typically, lease renewals happen 1/2 way through the lease time.

The new DHCP server should ping the address before it assigns it, but you might get IP address conflicts. In that case, the phone reboots and tries to get a new address.

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Lelio Fulgenzi, B.A.
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
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  ----- Original Message ----- 
  From: Ed Leatherman 
  To: ciscovoip 
  Sent: Thursday, June 07, 2007 9:31 AM
  Subject: [cisco-voip] DHCP Behavior


  I'm getting ready to start migrating ip phones off of the DHCP service on our callmanager to a DHCP appliance (infoblox). I've got the lease timer down to 1 hour now on my first set of phones, my next step is going to be to change the ip helper-address on the routers and deactivate the scope in DHCP on the windows box. 

  How do the phones behave when they try to renew and their original DHCP server isnt there? Do i need to reset all of them, or will they find the new server on their own? 

  -- 
  Ed Leatherman
  Senior Voice Engineer
  West Virginia University
  Telecommunications and Network Operations 


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