From: P729 (p729@cox.net)
Date: Sun Mar 09 2003 - 19:07:27 GMT-3
I don't know because I haven't tried it. I've seen that config ('voice vlan'
with 'mode trunk') in a Networkers presentation, but according to the docs,
'voice vlan' should be configured on an access port. This is mentioned in
the 3550 and 3500 XL docs. Perhaps the command is compatible with 'mode
trunk' and just applies the CoS map/trust, etc. The default for 'mode trunk'
is to allow all VLAN's.
My 3550 hasn't arrived yet, so perhaps someone with a real switch can chime
in.
Regards,
Mas Kato
https://ecardfile.com/id/mkato
----- Original Message -----
From: "Mahmud, Yasser" <YMahmud@Solutions.UK.ATT.com>
To: "'P729'" <p729@cox.net>
Cc: <ccielab@groupstudy.com>
Sent: Sunday, March 09, 2003 9:39 AM
Subject: RE: 4p84: RE: voice vlans correct configuration
Mas,
Thks for the explanation,
One for more thing if we use auxiliary VLAN option then the VLAN's allowed
automatically are only the access vlan and voice vlan.
Now if we use the dot1q method are the VLAN's allowed listed as all ?? / or
is it just the native and voice vlan ??(because of the functionality of the
switchport voice command)
Thks
Yasser
> -----Original Message-----
> From: P729 [SMTP:p729@cox.net]
> Sent: Sunday, March 09, 2003 5:20 PM
> To: Mahmud, Yasser
> Cc: ccielab@groupstudy.com
> Subject: Re: 4p84: RE: voice vlans correct configuration
>
> It's a special case--a so-called "auxiliary VLAN." It supports the tag but
> it doesn't carry the trunking protocols, etc. Certain switches with later
> code can be configured to detect whether there is really a phone on the
> other end before forming the aux VLAN to make it more difficult for
> someone
> to emulate a trunk and abuse the trusted CoS.
>
> Regards,
>
> Mas Kato
> https://ecardfile.com/id/mkato
>
> ----- Original Message -----
> From: "Mahmud, Yasser" <YMahmud@Solutions.UK.ATT.com>
> To: "'Scott Morris'" <swm@emanon.com>
> Cc: <ccielab@groupstudy.com>
> Sent: Sunday, March 09, 2003 7:43 AM
> Subject: RE: 4p84: RE: voice vlans correct configuration
>
>
> Scott,
> If you use the the below config then does it mean the the connection b/w
> the
> phone and the 3550 doesn't create a 802.1 trunk. How is it possible then
> for
> the connection to support a vlan tag for voice traffic in
> order to differentiate b/w voice and data traffic.
>
> 1.
> mls qos
> !
> interface fastethernet 0/10
> switchport mode access
> switchport access vlan 10
> switchport voice vlan 100
> mls qos trust cos
>
> Rgds,
> Yasser
>
>
>
> > -----Original Message-----
> > From: Scott Morris [SMTP:swm@emanon.com]
> > Sent: Wednesday, February 26, 2003 1:39 PM
> > To: zhaozx@DigitalChina.com; 'Hunt Lee'
> > Cc: ccielab@groupstudy.com
> > Subject: RE: 4p84: RE: voice vlans correct configuration
> >
> > Voice VLANs are actually an access-port technology. They can be done
> > with a trunk port as well, but if you do it that way, do you not think
> > you'd need to turn off a lot of VLANs (extraneous ones) to that trunk?
> > No sense sending EVERYTHING to your phone!
> >
> > Both are workable configurations. IMHO, the access-port method is the
> > "more correct" one.
> >
> > Scott
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > zhaozx@DigitalChina.com
> > Sent: Wednesday, February 26, 2003 1:22 AM
> > To: Hunt Lee
> > Cc: ccielab@groupstudy.com
> > Subject: 4p84: RE: voice vlans correct configuration
> >
> >
> > mls qos
> > !
> > interface fastethernet 0/10
> > switchport mode trunk
> > awitchport trunk native vlan 10
> > switchport trunk encapsulation dot1q
> > switchport voice vlan 100
> > mls qos trust cos
> >
> >
> > the 2nd one...
> >
> > Voice VLAN only works on a Trunk port ;-)
> >
> > Regards,
> > Hunt
> >
> >
> > -----Original Message-----
> > From: Cezar Fistik [mailto:cfistik@moldovacc.md]
> > Sent: Wednesday, 26 February 2003 12:57 PM
> > To: ccielab@groupstudy.com
> > Subject: voice vlans correct configuration
> >
> >
> > Hi group,
> >
> > Could you please, share your ideas about the following configurations.
> > Just assume that an ip phone is connected to int fast 0/10 and to the
> > phone is connected a pc that is supposed to be in vlan 10
> >
> > 1.
> > mls qos
> > !
> > interface fastethernet 0/10
> > switchport mode access
> > switchport access vlan 10
> > switchport voice vlan 100
> > mls qos trust cos
> >
> > 2.
> > mls qos
> > !
> > interface fastethernet 0/10
> > switchport mode trunk
> > switchport trunk encapsulation dot1q
> > switchport voice vlan 100
> > mls qos trust cos
> >
> > Which one do you think is correct? Or if they are both incorect I'll
> > appreciate any advice.
> >
> > Thanks,
> > Cezar Fistik
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