[PACUG] RE: [cisco-voip] Ip phone are not able to pull address from new DHCPserver

[Wes Sisk]

Only thing that comes to mind is dhcp offer never reached the phone 
(broadcast suppression?)

/Wes

Rossella Mariotti-Jones wrote:

>After capturing some packets we found that the DHCP offer gets passed to
>the phone vlan through the gateway but there is no DHCP request going
>back to the gateway from the phone. Our set up is very similar to what's
>described here:
>http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a
>0080114aee.shtml#how except the interface on the 6500 to which the
>phone/pc connects to is not set up as trunk as described in the article,
>our interface is set up this way:
>interface FastEthernet8/31
>no ip address
> switchport
> switchport access vlan 600
> switchport voice vlan 200
>However, it's always worked perfectly up until now.
>What would not allow the ip phone to send out a DHCP request?
>
>Rossella Mariotti-Jones
>Network Analyst, CCNA
>Chemeketa Community College / IT
>T 503 589 7775
>F 503 399 4898
>E rossella at chemeketa.edu
>www.chemeketa.edu
>
>-----Original Message-----
>From: Wes Sisk [mailto:wsisk at cisco.com] 
>Sent: Thursday, March 24, 2005 7:30 AM
>To: Portland Area Cisco Users Group; Rossella Mariotti-Jones
>Subject: Re: [PACUG] RE: [cisco-voip] Ip phone are not able to pull
>address from new DHCPserver
>
>I saw this once before when the switchport for the DHCP server was 
>configured to be a trunk port.
>The DHCP server saw every DHCP DISCOVER message twice. Once on the 
>native voice vlan, and once with the DHCP relay agent correctly set by 
>the router in the DHCP server. Because the discovers were slightly 
>staggered, the DHCP server would NAK that subsequent DHCP REQUEST.
>
>Can you get a sniffer trace at the DHCP server or a sniffer trace of all
>
>traffic in/out of the phone?
>
>/Wes
>
>Rossella Mariotti-Jones wrote:
>
>  
>
>>The TFTP server is running, nothing has changed except for the DHCP 
>>server itself. The ip phone shows up in the list of leases on the DHCP
>>    
>>
>
>  
>
>>server which means that the DHCP has passed an IP address to it but 
>>the phone is stuck on 'configuring IP' and won't go further, I'm 
>>wondering at this point if there's something I need to change in CM?
>>
>>//Rossella Mariotti-Jones//
>>
>>//Network Analyst, CCNA//
>>
>>**/Chemeketa/****/ Community College/****/ / IT/**
>>
>>//T 503 589 7775//
>>
>>//F 503 399 4898//
>>
>>//E ////rossella at chemeketa.edu// <mailto:rossella at chemeketa.edu>
>>
>>//www.chemeketa.edu//
>>
>>
>>    
>>
>------------------------------------------------------------------------
>  
>
>>*From:* Voll, Scott [mailto:Scott.Voll at wesd.org]
>>*Sent:* Tuesday, March 22, 2005 10:54 AM
>>*To:* Rossella Mariotti-Jones
>>*Cc:* cisco-voip at puck.nether.net
>>*Subject:* RE: [cisco-voip] Ip phone are not able to pull address from
>>    
>>
>
>  
>
>>new DHCPserver
>>
>>make sure the tftp server is running on the same ip your giving out in
>>    
>>
>
>  
>
>>the 150 scope.
>>
>>
>>    
>>
>------------------------------------------------------------------------
>  
>
>>*From:* Rossella Mariotti-Jones [mailto:rossella at chemeketa.edu]
>>*Sent:* Tue 3/22/2005 10:37 AM
>>*To:* Voll, Scott
>>*Cc:* cisco-voip at puck.nether.net
>>*Subject:* RE: [cisco-voip] Ip phone are not able to pull address from
>>    
>>
>
>  
>
>>new DHCPserver
>>
>>Hey Scott!, yes we did, we also did a factory reset... thanks for 
>>checking though ;-)
>>
>>//Rossella Mariotti-Jones//
>>
>>//Network Analyst, CCNA//
>>
>>**/Chemeketa/****/ Community College/****/ / IT/**
>>
>>//T 503 589 7775//
>>
>>//F 503 399 4898//
>>
>>//E ////rossella at chemeketa.edu// <mailto:rossella at chemeketa.edu>
>>
>>//www.chemeketa.edu//
>>
>>
>>    
>>
>------------------------------------------------------------------------
>  
>
>>*From:* Voll, Scott [mailto:Scott.Voll at wesd.org]
>>*Sent:* Tuesday, March 22, 2005 10:31 AM
>>*To:* Rossella Mariotti-Jones; cisco-voip at puck.nether.net
>>*Subject:* RE: [cisco-voip] Ip phone are not able to pull address from
>>    
>>
>
>  
>
>>new DHCPserver
>>
>>have you unplugged the phone and plugged it back in yet?
>>
>>
>>    
>>
>------------------------------------------------------------------------
>  
>
>>*From:* cisco-voip-bounces at puck.nether.net on behalf of Rossella 
>>Mariotti-Jones
>>*Sent:* Tue 3/22/2005 10:23 AM
>>*To:* cisco-voip at puck.nether.net
>>*Subject:* [cisco-voip] Ip phone are not able to pull address from new
>>    
>>
>
>  
>
>>DHCPserver
>>
>>I forgot to say that the DHCP server does show that the phone has 
>>acquired an address.
>>
>>//Rossella Mariotti-Jones//
>>
>>//Network Analyst, CCNA//
>>
>>**/Chemeketa/****/ Community College/****/ / IT/**
>>
>>//T 503 589 7775//
>>
>>//F 503 399 4898//
>>
>>//E ////rossella at chemeketa.edu// <mailto:rossella at chemeketa.edu>
>>
>>//www.chemeketa.edu//
>>
>>-----------------------------------------------------------------------
>>    
>>
>-
>  
>
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>>    
>>
>
>
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