From: Richard Dumoulin (richard.dumoulin@vanco.es)
Date: Wed Jun 16 2004 - 22:20:22 GMT-3
Well, not sure where you read that but normally you need trunk if if you
want to use COS. More over if you are going to separate data from voice
vlans on the same port then how else can you do it ?
Note that by default, when plugging a Cisco phone onto the switch the trunk
will be dynamically negociated,
--Richard
-----Original Message-----
From: Tom Young [mailto:gitsyoung@yahoo.co.jp]
Sent: jueves, 17 de junio de 2004 3:11
To: Nii orfson
Cc: ccielab@groupstudy.com
Subject: RE: Voice vlan setting
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> $B$+$i$N%a%C%;!<%8!'(J
<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>
$B$+$i$N(J
<DIV></DIV>>$B%a%C%;!<%8!'(J
<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>> >
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