From: NET HE (he_net@hotmail.com)
Date: Sun Feb 22 2009 - 14:05:56 ARST
This is what I understand. Since I couldn't lab it up, maybe somebody can
correct me.
When MLS QOS is enable on a switch, for ingress packets the switch must refer
to a internal DSCP for qos processing, and then the egress packets DSCP field
is replaced by the internal DSCP value. The flows would be, for example,
Case 1: trust COS, regardless it's configured by policy-map or interface
command. The switch then uses cos-to-dscp map to create the internal DSCP
value.
Case 2: trust DSCP, regardless it's configured by policy-map or interface
command. The switch then uses dscp-to-dscp-mutation map to create the internal
DSCP value.
Case 3: trust IP Precedence, regardless it's configured by policy-map or
interface command. The switch then uses ip-precedence-to-dscp map to create
the internal DSCP value.
*Case 4: policy-map police exceed-action policed-dscp-transmit, the switch
then uses police-dscp-map to create the internal DSCP value for exceeding
traffic.
Best Regards,
Net (Xin) He
> Date: Sun, 22 Feb 2009 16:11:57 +0530
> Subject: "POliced-dscp transmit"
> From: gauravmadan1177@gmail.com
> To: ccielab@groupstudy.com
>
> Hi Group
>
> I am not at all able to understand what this command achieves under
> policy-map clas config
>
> exceed-action policed-dscp-transmit
> Which global mapp it reads and how ..
>
> Rack1SW4#show mls qos maps ?
> cos-dscp cos-dscp map keyword
> cos-input-q cos-input queue map keyword
> cos-output-q cos-output queue map keyword
> dscp-cos dscp-cos map keyword
> dscp-input-q dscp-input queue map keyword
> dscp-mutation dscp-mutation map keyword
> dscp-output-q dscp-output queue map keyword
> ip-prec-dscp ip-prec-dscp map keyword
> policed-dscp policed-dscp map keyword <<<<<<<<<<<<<<<<
> | Output modifiers
> <cr>
> Rack1SW4#show mls qos maps po
> Rack1SW4#show mls qos maps policed-dscp
> Policed-dscp map:
> d1 : d2 0 1 2 3 4 5 6 7 8 9
> ---------------------------------------
> 0 : 00 01 02 03 04 05 06 07 08 09
> 1 : 10 11 12 13 14 15 16 17 18 19
> 2 : 20 21 22 23 24 25 26 27 28 29
> 3 : 30 31 32 33 34 35 36 37 38 39
> 4 : 40 41 42 43 44 45 46 47 48 49
> 5 : 50 51 52 53 54 55 56 57 58 59
> 6 : 60 61 62 63
>
>
> I will be greatful ; if someone explain this or give pouinter to good write
> up on this .
>
> Gaurav Madan
>
>
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