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

[Erick Bergquist]

Have you tried to configure the switchport strictly as
a access port in the voice VLAN only connecting to the
IP Phone? 

switchport mode access
switchport access vlan 200
switchport voice vlan 200

What version of firmware is on phone?

I have seen older firmware versions not send/receive
DHCP right when on trunk port and once we plugged
phone into port only in voice VLAN and it's firmware
was updated to a current version it worked on the
trunked port fine.

--- Rossella Mariotti-Jones <rossella at chemeketa.edu>
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>



		
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