From: Swaroop Potdar (swarooppotdar@hotmail.com)
Date: Wed Nov 03 2004 - 05:57:13 GMT-3
Hi David,
On a Cisco I had see the output of show int x switchport after the voice and
data vlan configuration.
and they had configured the port as trunk d0t1q and the output was :
vlan 100 (data vlan ) was showing as access mode vlan
native vlan was as usual vlan 1
and voice vlan was 101
but you specified that the data vlan with ip phone connected is the native
vlan as the packets are untagged.
are we looking at 3550 in this discussion.
your inputs would be valuable..
Thanks,
Swaroop.
>From: "David Pues (dpues)" <dpues@cisco.com>
>Reply-To: "David Pues (dpues)" <dpues@cisco.com>
>To: "Brian McGahan" <bmcgahan@internetworkexpert.com>, <reo@chavallos.net>,
> <ccielab@groupstudy.com>
>Subject: RE: voice Vlan
>Date: Tue, 2 Nov 2004 17:47:35 +0100
>
>It all depends on the type of switch used. Basically a trunk is NOT a
>requirement between the IP phone and the switch except eg for a switch
>module in a router.
>
>The voice vlan config is basically there to let the phone know via CDP
>how to tag the packets it sends (originated from the phone). At that
>moment the phone will just pick this up via CDP and when ever it sends a
>packet, it will tag it. The way Cisco has implemented this does not
>require a trunk to be there (with the above exception). In this mode,
>the switch will also not tag any packets out the port, which is not
>required as the phone just looks at the destination MAC address and only
>sends these packets to its logic (phone does MAC filtering). It does not
>really look at the tags.
>The voice vlan has a significance upstream to the network, not
>downstream to the phone/pc.
>
>Eg on a Cat4k, cat6k, cat3550 etc, putting the port in access mode into
>the data vlan and assigning the voice/auxiliary vlan should do the
>trick.
>When you do configure a .1Q trunk, make sure to configure the data vlan
>for the pc as the native vlan (as the phone just forwards the packets
>which are not destined for the phone logic, without untagging the
>packet) unless the daisy-chained device understands the tags....
>
>So, Ahmed, native vlans are used when trunking and makes sure that the
>data packets are untagged; access vlan is used in access mode.
>
>My 2 cents,
>
>David - CCIE 9666
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Brian McGahan
>Sent: Tuesday, November 02, 2004 5:29 PM
>To: reo@chavallos.net; ccielab@groupstudy.com
>Subject: RE: voice Vlan
>
> You cannot issue the "switchport mode access" command on the
>interface otherwise trunking negotiation cannot occur.
>
>Brian McGahan, CCIE #8593
>bmcgahan@internetworkexpert.com
>
>Internetwork Expert, Inc.
>http://www.InternetworkExpert.com
>Toll Free: 877-224-8987 x 705
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>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>Of
> > reo@chavallos.net
> > Sent: Tuesday, November 02, 2004 9:51 AM
> > To: ccielab@groupstudy.com
> > Subject: Re: voice Vlan
> >
> > Here's an example
> >
> > ---
> > interface GigabitEthernet1/2
> > no ip address
> > switchport
> > switchport access vlan 30
> > switchport mode access
> > switchport voice vlan 130
> > ---
> >
> > ----- Original Message -----
> > From: "Ahmed Hassan" <ahmed_hassan@rayatelecom.net>
> > To: <ccielab@groupstudy.com>
> > Sent: Tuesday, November 02, 2004 1:01 AM
> > Subject: voice Vlan
> >
> >
> > > HI,
> > > When we configure a port with the command Switchport voice Vlan 20
> > >
> > > How we configure the data VLAN on the same port
> > >
> > > Switchport access vlan 10
> > >
> > > Or
> > >
> > > Switchport native vlan 10
> > >
> > > Or Both
> > > Switchport access vlan 10
> > > Switchport native vlan 10
> > >
> > > Best Regards
> > > Ahmed Hassan
> > > Product Development Supervisor
> > > Raya Telecom
> > >
> > >
>_______________________________________________________________________
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
> >
> >
>_______________________________________________________________________
> > Subscription information may be found at:
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>
>_______________________________________________________________________
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Regards,
Swaroop.
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