From: Ken.Farrington@barclayscapital.com
Date: Mon Oct 27 2003 - 12:56:33 GMT-3
Have woked out the two i thin with the override.
Use the override keyword when all incoming packets on certain ports deserve
higher or lower priority than packets entering from other ports. Even if a
port is
previously set to trust DSCP, CoS, or IP precedence, this command overrides
the previously configured trust state, and all the incoming CoS values are
assigned the
default CoS value configured with the mls qos cos command. If an incoming
packet is tagged, the CoS value of the packet is modified with the default
CoS of the
port at the ingress port.
Just not sure about the other (first one)
-----Original Message-----
From: Ken.Farrington@barclayscapital.com
[mailto:Ken.Farrington@barclayscapital.com]
Sent: 27 October 2003 15:53
To: matijevi@bellsouth.net; ccielab@groupstudy.com
Subject: RE: Voice Help - CoS Setting - PLEASE :(
Many Thx indeed for the fast response,
I have another example fro the 3550 guide which I am just hoping to clarify
This example shows how to configure the default port CoS to 4:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mls qos trust cos
Switch(config-if)# mls qos cos 4
This example shows how to assign all the packets entering a port to the
default port CoS value of 4:
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mls qos cos 4
Switch(config-if)# mls qos cos override
Can I just confirm that example one, leaves the trusted CoS values (say from
an IP phone) in tact, and any untagged (ie DATA) frames are set to a C0S of
4.
In the second, all packets regales if trusted are overwritten with the
default cos vlaue.
Thing is, I have configure a port as such,
!
interface FastEthernet0/2
switchport access vlan 100
no ip address
mls qos cos 5
mls qos cos override
mls qos trust cos
!
Does this config, mean that all trusted cos values get overridden by the
override command - even with the trust command in the config?
Many thx to all,
Ken
-----Original Message-----
From: matijevi@bellsouth.net [mailto:matijevi@bellsouth.net]
Sent: 27 October 2003 15:37
To: Ken.Farrington@barclayscapital.com; ccielab@groupstudy.com
Subject: Re: Voice Help - CoS Setting - PLEASE :(
Ken,
I believe your first answer is correct based on the 3550 admin guide:
switchport priority extend
cos value
Set the IP phone access port to override the priority received from the
PC or the attached device.
The CoS value is a number from 0 to 7. Seven is the highest priority.
The default is 0.
Sincerely,
Matijevic
----- Original Message -----
From: <Ken.Farrington@barclayscapital.com>
To: <ccielab@groupstudy.com>
Sent: Monday, October 27, 2003 10:11 AM
Subject: Voice Help - CoS Setting - PLEASE :(
> Hi Guys,
>
> I have a question re the tagging of CoS values.
>
> If I have an IP phone, with a PC connected and I get a question "Overide
to
> CoS priority on all Data Frames"
>
> Can I do this two ways.
>
> int fa 0/2
> switchport priority extend cos <value>
>
> int fa 0/2
> mls qos cos <value>
>
> I undertsand the first to have the IP phone set the CoS and the second,
the
> switchport sets the CoS value for all data "UNTAGGED" frames.
>
> Which one should I use, or am I even half correct?
>
> Many thx,
> Ken
>
>
> ------------------------------------------------------------------------
> For more information about Barclays Capital, please
> visit our web site at http://www.barcap.com.
>
>
> Internet communications are not secure and therefore the Barclays
> Group does not accept legal responsibility for the contents of this
> message. Although the Barclays Group operates anti-virus programmes,
> it does not accept responsibility for any damage whatsoever that is
> caused by viruses being passed. Any views or opinions presented are
> solely those of the author and do not necessarily represent those of the
> Barclays Group. Replies to this email may be monitored by the Barclays
> Group for operational or business reasons.
>
> ------------------------------------------------------------------------
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Mon Nov 24 2003 - 07:53:09 GMT-3