[cisco-voip] 7940 7960 wont grab ip from dhcp off switch

[Justin Steinberg]

James,

Make sure you remove the switchport voice vlan command from the
interface that connects to your data vlan DHCP server.

The server handling your data vlan DHCP service could be responding to
the DHCP request faster than the 3750.

Justin



On 6/24/06, James Grace <jgrace at digitelusa.net> wrote:
> What I notice also, is the these phone are getting address from the data
> remote dhcp server.  But when you look at the setting on the phone it has
> the correct vlan id
>
> -----Original Message-----
> From: Jonathan Charles [mailto:jonvoip at gmail.com]
> Sent: Friday, June 23, 2006 11:05 PM
> To: Ted Nugent
> Cc: Wydra, Jason; James Grace; cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] 7940 7960 wont grab ip from dhcp off switch
>
> Another fun thing is if there is a rogue VLAN sitting in the vlan
> database...
>
> Do a show vlan and see if there are VLANs on the switch that don't
> make sense to you... if so, go into VLAN database and delete them...
>
> Also, note the fact that you CANNOT configure a 3550, 3560 or 3570 to
> have a voice vlan and configured as a trunk port... the voice vlan is
> ignored...
>
>
>
> Jonathan
>
> On 6/23/06, Ted Nugent <tednugent69 at yahoo.com> wrote:
> > Another Problem I've seen that could be contributing
> > to this is if you set the access vlan and voice vlan
> > the same. (I think it's a bug but have not
> > investigated it).
> > sw acces vlan 4
> > sw voice vlan 4
> > Changing to a different access vlan typically fixes
> > this. Also mokeying with the DHCP properties have
> > caused the same problem and simply changing the access
> > vlan to to something else and changing it back
> > resolves the problem. You may need to down the sw port
> > to get this to take.
> >
> >
> > --- "Wydra, Jason" <jwydra at Burwood.com> wrote:
> >
> > > Are you doing true trunking (encap dot1q) on these
> > > ports or are you
> > > doing an access vlan and voice vlan?
> > >
> > > -----Original Message-----
> > > From: cisco-voip-bounces at puck.nether.net
> > > [mailto:cisco-voip-bounces at puck.nether.net] On
> > > Behalf Of Jonathan
> > > Charles
> > > Sent: Friday, June 23, 2006 9:39 PM
> > > To: James Grace
> > > Cc: cisco-voip at puck.nether.net
> > > Subject: Re: [cisco-voip] 7940 7960 wont grab ip
> > > from dhcp off switch
> > >
> > > Do they show up in a 'show cdp neighbors'? If not,
> > > you may want to
> > > enable CDP so the phones can see the voice vlan.
> > >
> > >
> > > Jonathan
> > >
> > > On 6/23/06, James Grace <jgrace at digitelusa.net>
> > > wrote:
> > > >
> > > >
> > > >
> > > >
> > > > We have a 3750 with dhcp scope config on it.  We
> > > have all type of
> > > phone and
> > > > wireless ap (cisco) that are pulling from this
> > > scope.  But for some
> > > reason
> > > > the 7940s and 7960s are grabing ip from the data
> > > remote dhcp server.
> > > The
> > > > switch is not recognizing these phones
> > > >
> > > >
> > > >
> > > > James D. Grace
> > > >
> > > > CCNP CCNA MCSE MCDBA
> > > >
> > > > Sr. System Engineer / Professional Svc.
> > > >
> > > > Digitel Corporation
> > > >
> > > >
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> > > >
> > > >
> > > >
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