Re: MLS QOS

1) doesn't matter because the switch will use it's mappings to take dscp
value and convert to associated cos more importantly the mappings have to
be adjusted. either command is good but I would also add a 'switchpot voice
vlan XX' putting the phone into another network and 'mls qos trust device
cisco-phone'. These commands will put cisco phones on another vlan and use
macros to ensure .1p is set up properly.

2) The Cisco phones will most likely mark both but switch will only use
CoS. The DSCP values are adjusted based on the internal switch mappings.
This mapping is not ideal left to default values and is typically fixed
manually. I don't know why cisco just didn't make it default. ... This
command : 'mls qos map cos-dscp 0 8 16 24 32 46 48 56' is used in global
config to map EF (IP precedence 5) to the dscp value 46.

You are taking the right steps for Catalyst QoS good luck!

HTH

Marc

On Sat, May 26, 2012 at 5:04 AM, Carlos Mendioroz <tron_at_huapi.ba.ar> wrote:

> COS fpr sure.
> Phones mark COS & DSCP but only remark COS, so if you want tp extend the
> trust border, you have tp trust COS.
> -Carlos
>
> --
> Carlos Mendioroz <tron_at_acm.org>
>
> -----Original message-----
> From: Vincent Tay <vtay.75_at_gmail.com>
> To: "Ccielab_at_groupstudy.com" <ccielab_at_groupstudy.com>
> Sent: Sat, 26 May 2012, 05:36:38 GMT+00:00
> Subject: MLS QOS
>
> Hi all,
>
> I got the below questions to clarify.
>
> 1) When a cisco VoIP phone is connected to a switchport, which is better?
> mls qos trust dscp or mls qos trust cos?
>
> 2) The cisco phone will mark cos or dscp value or both? If mls qos trust
> cos is use, must i map the cos 5 to dscp 46 manually?
>
> Regards
> Vincent Tay
>
>
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Received on Sat May 26 2012 - 07:55:29 ART