From: Teck PhrEAk!! (phreakinphunk@hotmail.com)
Date: Thu Apr 03 2003 - 03:36:42 GMT-3
yes u are right there.....a pc cannot form a trunk with the IP Phone hence
cannot set a CoS value .....the only way i see it happening is maybe its the
IP Phone which appends a default CoS value to the packet coming in from the
PC b4 sending it out on the trunk to the switch.....
still phoxed!.....i think i missed the boat this time round..... ;-)
cheers
sumit.
>From: "Daniel Cisco Group Study" <danielcgs@imc.net.au>
>To: "Teck PhrEAk!!" <phreakinphunk@hotmail.com>, <ccielab@groupstudy.com>
>Subject: RE: 3550 Voice Vlans
>Date: Thu, 3 Apr 2003 06:33:33 +1000
>
>Agree 100%..... The other command that I missed, which is what I'm all
>confused about is:
>
>switchport priority extend trust|cos x
>
>which is used to trust / override the COS set by the PC in the access VLAN
>(connected to the phone)..... which brings me back to my question below.
>
>Thanks,
>
>Daniel
>
>
>-----Original Message-----
>From: Teck PhrEAk!! [mailto:phreakinphunk@hotmail.com]
>Sent: Thursday, 3 April 2003 1:34 AM
>To: Daniel Cisco Group Study; ccielab@groupstudy.com
>Subject: Re: 3550 Voice Vlans
>
>
>hi daniel,
>
>yr configs shud look like this.....and u havent missed the boat!
>
> >mls qos
> >!
> >interface fastethernet 0/10
> >switchport access vlan 10
> >switchport voice vlan 100
> >mls qos trust cos
>
>the only change is that there is no "switchport mode access" as this
>command
>would force the port into access mode and it wudnt form a 802.1q trunk with
>the IP Phone.This config requires the port to be in the default mode i.e
>"Dynamic,Desirable" so the IP Phone can form the trunk as and when
>required.........and the CoS value wud then be carried thru.
>
>This is how i understand it.......ppl correct me if i am wrong....
>
>cheers,
>
>sumit.
>ccie#11125
>ccdp,ccnp,rhce,scsa,mcse,ibm e-biz
>TRANCE DJ......
>
>
>
>
>
>
> >From: "Daniel Cisco Group Study" <danielcgs@imc.net.au>
> >Reply-To: "Daniel Cisco Group Study" <danielcgs@imc.net.au>
> >To: <ccielab@groupstudy.com>
> >Subject: 3550 Voice Vlans
> >Date: Wed, 2 Apr 2003 22:11:53 +1000
> >
> >I've researched this one heavily, but there is still something that is
>not >clicking in my brain.....
> >
> >There's lots of documentation about voice vlans, and about trusting or
>not >trusting the COS values of packets from the PC attached to the IP
>Phone. >All sounds very nice and useful.
> >
> >However, unless a user somehow trunks to the phone, he can't set COS
>values
> >anyway as these are carried in the 802.1p portion of the 802.1q header.
>Why
> >are we worried about trusting or not trusting the COS values from the
>PC???
> >
> >I'm referring to configurations like the following: (not the traditional
> >trunking method):
> >
> >mls qos
> >!
> >interface fastethernet 0/10
> >switchport mode access
> >switchport access vlan 10
> >switchport voice vlan 100
> >mls qos trust cos
> >
> >
> >In addition, what is the difference between the following:
> >
> >(a) switchport voice vlan 100
> >(b) switchport voice vlan dot1p
> >
> >Refer to doco:
> >
> >http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12112cea/3550scg/swvoip.htm#51534
> >
> >The Docos are very unclear..... and again, dot1p is carried within dot1q,
> >or I've missed the boat.
> >
> >Daniel
> >
> >
> >
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