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

[Jonathan Charles]

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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> > > cisco-voip at puck.nether.net
> > >
> > https://puck.nether.net/mailman/listinfo/cisco-voip
> > >
> > >
> > >
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> >
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> >
>
>
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