From: Anthony Sequeira (terry.francona@gmail.com)
Date: Thu Dec 01 2005 - 18:07:06 GMT-3
Hi John!
You cannot enter the command below on a 3550 without getting an error
message! You need to actually provide the DSCP values that you want to
assign based on the IP Precedence values of 0 through 7. Here is an example
of the full command syntax:
*mls qos map ip-prec-dscp 10 15 20 25 30 35 40 45
*
Now - as far as how you apply it to an interface - the 3550 documentation
states:
"All the maps, except the DSCP-to-DSCP-mutation map, are globally defined
and are applied to all ports.You can have multiple DSCP-to-DSCP-mutation
maps and apply them to different Gigabit-capable Ethernet ports. However, on
10/100 Ethernet ports, you can attach only one DSCP-to-DSCP-mutation map to
a group of twelve ports. "
So, based on this, realize that you ip-prec-dscp map is automatically
applied to all interfaces after you create it.
Also - do not forget the command mls qos before you do anything with QoS
manipulation on the 3550.
Here is the documentation link I consulted and quoted:
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225sec/3550scg/sw
qos.htm#wp1150175
On 12/1/05, John Caronilli <jcaronilli@yahoo.com> wrote:
>
> On the 3550, I configured the command:
>
> mls qos map ip-prec-dscp
>
> How is that command applied to an interface? How do
> you tell the switch to convert all packets arriving on
> say Fast 0/3 from the IP precedence value to DSCP
> values?
>
> How does the switch know the arriving packet is not
> already using DSCP?
>
> Thanks!
>
> John
>
>
>
>
>
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