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

[Rossella Mariotti-Jones]

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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