RE: Voice vlan setting

From: Nii orfson (norfson@hotmail.com)
Date: Wed Jun 16 2004 - 22:22:12 GMT-3

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The concept of the voice vlan is to separate the voice traffic from data.
The concept of trunking is to accept the class of service priority within
the frame header 2-byte tag. If the phone is setting the IP precedence or
DSCP in the IP header, the switch would accept it if the access port is
configured to "trust". You can, however, mark the incoming priority down
or up. Tell me exactly what you are trying to achieve, and what switch
platform you are using.

joe

>From: Tom Young <gitsyoung@yahoo.co.jp> >To: Nii orfson
<norfson@hotmail.com> >CC: ccielab@groupstudy.com >Subject: RE: Voice
vlan setting >Date: Thu, 17 Jun 2004 10:11:27 +0900 (JST) > >In the
cisco.com's voice vlan configuration guidelines.It >said should configure
voice VLAN on switch access ports. >So the trunk mode is useless. >
>Infact , one thing I am very worry about, that is the voip >telephone
could set the ip precedence and Diffserv >parameter. If the voice traffic
pass through the catalyst, >I am worry about ip precedence and Diffserv
setting will >be changed to the default. > > >--- Nii orfson
<norfson@hotmail.com> )gLbZ[WF > ><HR> ><html><div
style='background-color:'><DIV class=RTE> ><P>I would still recommend
using setting a voice vlan to >separate the voice from the data
traffic.  If you are >not using a cisco phone, trunking between the
switch and >the phone might be useless. If trunking is not enabled on
>the ingress port, then the switch will not recieve QoS >setting from the
phone. However, a PC attached to the >phone might try set traffic with a
higher priority, so use >the switchport priority extend cos to prevent
this. Set >the voice media traffic on the ingress port to cos 5 or >dscp
46, set the voice signalling to cos 3, and set data >to cos
0.<BR><BR></P></DIV> ><DIV></DIV>>From: Tom Young
><gitsyoung@yahoo.co.jp> ><DIV></DIV>>Reply-To: Tom Young
><gitsyoung@yahoo.co.jp> ><DIV></DIV>>To: Richard Dumoulin
><richard.dumoulin@vanco.es> ><DIV></DIV>>CC:
ccielab@groupstudy.com ><DIV></DIV>>Subject: RE: Voice vlan setting
><DIV></DIV>>Date: Thu, 17 Jun 2004 09:16:49 +0900 (JST) >
><DIV></DIV>> ><DIV></DIV>>Richard
><DIV></DIV>>    If my IP phone is >not the cisco
ip phone. And only ><DIV></DIV>>voice communication be used . How
about >that two commands? ><DIV></DIV>> ><DIV></DIV>>And the cdp
will not work correctly, does >some affect will ><DIV></DIV>>happened
? ><DIV></DIV>> ><DIV></DIV>>Thanks alot ><DIV></DIV>>
><DIV></DIV>>--- Richard Dumoulin ><richard.dumoulin@vanco.es>
>)gL ><DIV></DIV>>bZ[WF ><DIV></DIV>> > Do you want
the pc attached to the >phone to be ><DIV></DIV>> > trsuted by the
phone ? If yes ><DIV></DIV>> > then you need "switchport priority
>extend trust". ><DIV></DIV>> > Then the switch will trust
><DIV></DIV>> > both the voice and the pc thx to "mls >qos trust
><DIV></DIV>> > cos". ><DIV></DIV>> > If not then just "mls
qos trust cos" >as the phone ><DIV></DIV>> > will override pc
traffic ><DIV></DIV>> > to COS 0, ><DIV></DIV>> >
><DIV></DIV>> > --Richard ><DIV></DIV>> > ><DIV></DIV>>
> -----Original Message----- ><DIV></DIV>> > From: Tom Young
>[mailto:gitsyoung@yahoo.co.jp] ><DIV></DIV>> > Sent: miircoles, 16
de junio de 2004 >17:08 ><DIV></DIV>> > To: ccielab@groupstudy.com
><DIV></DIV>> > Subject: Voice vlan setting ><DIV></DIV>> >
><DIV></DIV>> > ><DIV></DIV>> > Hi, group ><DIV></DIV>>
> ><DIV></DIV>> >  Look the two commands >below for
setting voice vlan. ><DIV></DIV>> > If I ><DIV></DIV>> > want
to trust a VoIP telephone >setting, should I ><DIV></DIV>> > need
set ><DIV></DIV>> > the two command on the voice vlan >interface ?
><DIV></DIV>> > ><DIV></DIV>> > switchport priority extend
trust ><DIV></DIV>> > mls qos trust cos ><DIV></DIV>> >
><DIV></DIV>> > Thanks alot ><DIV></DIV>> > ><DIV></DIV>>
> ><DIV></DIV>> > ><DIV></DIV>> >
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Next message: Richard Dumoulin: "RE: 802.1q/p"
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