From: Alan Ewer (acewer64@gmail.com)
Date: Tue Jun 26 2007 - 09:31:19 ART
Hi Avner
Yes.. I understand that without the QOS configuration there is no point ..i
was just unsure what the native vlan was talking about...now i can get my
head around the rest of the QOS stuff !!
Thanks again
Regds
AlanE
Oz
On 6/26/07, Avner Izhar <aizhar@ccbootcamp.com> wrote:
>
> Hi,
>
> IMHO, Native vlan is not an access port related attribute, it is a trunk
> port attribute.
>
> In your config all traffic will be sent on vlan 300, because it is the
> access vlan and this is an access port.
> Voice traffic will be marked (for qos purposes) but since the vlan ID will
> be 0, the marking will be interpreted as matching
> to the native vlan (or to the access in our case), and will be tagged as
> vlan 300 when entering the switch.
>
> There is no reason to config dot1p voice vlan without any qos related
> commands like 'mls qos trust cos' and
> 'switchport priority extend cos 0' . It's not a vlan control mechanism,
> it's a qos control one.
>
>
>
> -------------------------------------------
> Regards,
> Avner Izhar
> Technical Instructor
> CCIE #15999 (Voice)
> Voice: (702) 968-5100
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> ________________________________
>
> From: nobody@groupstudy.com on behalf of Alan Ewer
> Sent: Tue 6/26/2007 12:28 AM
> To: Cisco certification
> Subject: Re: Voice Vlan 0 - DOT1P
>
>
>
> Hi Guys..
>
> So I think my misunderstanding relates to the term "native vlan" in
> relation
> to an access port !
> I am more familiar with he term native vlan when talking about dot1q
> trunks... not access ports .. !!
>
>
> So..
> if the config is
>
> Fas 0/1
> switch access vlan 300
> switch voice vlan dot1p
>
>
> the native vlan is going to be Vlan300 ...true ?? and therefore the
> traffic
> will transit the switch as vlan 300 ?
>
> Regds
> AlanE
> Oz
>
>
> On 6/26/07, Antonio Soares <amsoares@netcabo.pt> wrote:
> >
> >
> > Here's a capture i made a few weeks ago:
> >
> > +++++++++++++++++++++++++++++++++++++++++
> > Frame 3 (118 bytes on wire, 118 bytes captured)
> > Ethernet II, Src: Cisco_f6:f1:65 (00:17:0e:f6:f1:65), Dst:
> Cisco_c3:0d:38
> > (00:15:63:c3:0d:38)
> > 802.1Q Virtual LAN
> > 000. .... .... .... = Priority: 0
> > ...0 .... .... .... = CFI: 0
> > .... 0000 0000 0000 = ID: 0
> > Type: IP (0x0800)
> > Internet Protocol, Src: 192.168.100.100 (192.168.100.100), Dst:
> > 192.168.100.1 (192.168.100.1)
> > Internet Control Message Protocol
> > +++++++++++++++++++++++++++++++++++++++++
> >
> > This was the Switch config:
> >
> > !
> > interface GigabitEthernet0/48
> > switchport access vlan 333
> > switchport mode dynamic desirable
> > switchport voice vlan dot1p
> > mls qos trust device cisco-phone
> > spanning-tree portfast
> > !
> >
> > These were my comments to the behaviour i saw:
> >
> > Data traffic untagged in and out, Voice traffic untagged out, tagged in
> > with
> > VLAN ID=0; PING DATA=OK, PING VOICE=OK
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Scott Morris
> > Sent: segunda-feira, 25 de Junho de 2007 13:57
> > To: 'M S'; acewer64@gmail.com; ccielab@groupstudy.com
> > Subject: RE: Voice Vlan 0 - DOT1P
> >
> > If there is no dot1q tag, there is no dot1p priority field!
> >
> >
> > Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> JNCIE
> > #153, CISSP, et al.
> > CCSI/JNCI-M/JNCI-J
> > VP - Technical Training - IPexpert, Inc.
> > IPexpert Sr. Technical Instructor
> >
> > A Cisco Learning Partner - We Accept Learning Credits!
> >
> > smorris@ipexpert.com
> >
> > Telephone: +1.810.326.1444
> > Fax: +1.810.454.0130
> > http://www.ipexpert.com <http://www.ipexpert.com/>
> >
> > _____
> >
> > From: M S [mailto:michaelgstout@hotmail.com]
> > Sent: Monday, June 25, 2007 12:08 AM
> > To: smorris@ipexpert.com; acewer64@gmail.com; ccielab@groupstudy.com
> > Subject: RE: Voice Vlan 0 - DOT1P
> >
> >
> >
> > I was looking at this today. Can you let me know if i have it backwards?
> > The 802.1p tag contains vlan 0, which is the native vlan. but when you
> > connect the cisco phone to the cisco switch a trunk is automatically
> > formed.
> > With switchport interface command switchport access vlan 5, wouldn't the
> > data traffic be tagged with vlan 5 and the 802.1p traffic be placed into
> > the
> > native vlan (vlan0)?
> >
> > THank You.
> >
> >
> >
> >
> > _____
> >
> > From: "Scott Morris" <smorris@ipexpert.com>
> > Reply-To: "Scott Morris" <smorris@ipexpert.com>
> > To: "'Alan Ewer'" <acewer64@gmail.com>, "'Cisco certification'"
> > <ccielab@groupstudy.com>
> > Subject: RE: Voice Vlan 0 - DOT1P
> > Date: Sun, 24 Jun 2007 21:59:21 -0400
> > If you search Cisco's website (or Google) you'll find lots of references
> > for
> > VLAN 0 in regards to Voice VLANs. Basically, this is a designation for
> > untagged frames, which means whatever your trunk's native VLAN is set to
> > in
> > the dot1q trunk to an IP phone, that's what VLAN 0 represents.
> >
> > That'll also mean it's the same VLAN as your PC's data behind the phone,
> > and
> > I'll tell you that's generally not a good idea in deployments. But this
> > is
> > all about the lab. :)
> >
> > So how about changing your voice vlan to something other than the
> default
> > command set!
> >
> > To an IP phone, you SHOULD be trunking. The general spec is voice is
> > tagged
> > (dot1q), PC data is untagged (access vlan AKA your trunk's native vlan,
> > untagged).
> >
> > HTH,
> >
> >
> > Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> JNCIE
> > #153, CISSP, et al.
> > CCSI/JNCI-M/JNCI-J
> > VP - Technical Training - IPexpert, Inc.
> > IPexpert Sr. Technical Instructor
> >
> > A Cisco Learning Partner - We Accept Learning Credits!
> >
> > smorris@ipexpert.com
> >
> > Telephone: +1.810.326.1444
> > Fax: +1.810.454.0130
> > http://www.ipexpert.com <http://www.ipexpert.com/>
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Alan
> > Ewer
> > Sent: Sunday, June 24, 2007 8:36 PM
> > To: Cisco certification
> > Subject: Voice Vlan 0 - DOT1P
> >
> > Hi all...
> > sorry if this has been answered before.....
> >
> > I am playing around with voice vlans on 3550's
> >
> > When I invoke the "switch voice vlan dot1p" command I get a message
> > referring to the voice VLAN being VLAN0, yet i cannot create/see VLAN 0
> >
> > So where is this mystical VLAN ? How do I use it and why is the voice
> > traffic there ?? I would have thought that i would put it on the default
> > native vlan for the interface (usually vlan 1) .....as usual the Cisco
> > doco
> > is unhelpful..and to some extent confusing (to me at least)...
> >
> > Also if voice vlan is 0 and access vlan is 1, doesnt this imply that the
> > port is also trunking ??
> >
> >
> > any explanation gratefully accepted..
> >
> > Regds
> > AlanE
> >
> > _______________________________________________________________________
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