From: GAURAV MADAN (gauravmadan1177@gmail.com)
Date: Mon Feb 23 2009 - 03:06:21 ARST
Thnx to all for responding
What I got from this is :
IN case you want to set the cos/dscp for out-of-profile traffic ; you can
instruct your switch to refer to mapping table "police-dscp"
And we can go ahead and globally change the maping table like all othe map
tables.
i.e
instead of saying .......exceed-action set-dscp-transmit <> violate action
set-dscp-transmit <> ;
we can say exceed action policed-dscp-transmit AND we can change the global
table to meet our requirements .
Correct me if I am wrong
Thnx again
Gaurav Madan.
On Sun, Feb 22, 2009 at 11:40 PM, Narbik Kocharians <narbikk@gmail.com>wrote:
> The "policed-dscp" option can be used when you need to set the DSCP for the
> conforming traffic to one value and the out of profile traffic to another
> value. For example if you look at Daniels example, where he has mapped 40 to
> 8, this is what you would do:
>
> I am NOT in front of a rack and i am doing this from memory so i apologies
> if there are any typos. Let's assume that the "*class-map QOS*" is already
> configured.
>
> Policy-map TST
> class QOS
> set dscp 40
> police 1000000 8000 exceed-action policed-dscp-transmit
>
> Remember that we are configuring a switch and the conform-action is NOT
> available, therefore, In this case you are marking the conforming traffic to
> a DSCP value of 40 and you are also saying that the out of profile traffic
> should be referring to the "policed-dscp" map.
>
> Since the mapping by default is one-to-one, you must change that mapping to
> reflect your configuration:
>
> *mls qos map policed-dscp 40 to 8*
>
> If you do a "*Show mls qos map policed-dscp*" you will see that the "d1
> and the d2" specify the conforming traffic and the body of the message
> refers to the out of profile traffic.
>
> For example, to see dscp 40, d1: (vertically) displays the "4" in the 40
> and the d2: (horizontally) displays the "0" in 40.
> If you check where these two lines meet, you should see 8, which is the
> DSCP vlaue set for the out of profile traffic.
>
> On Sun, Feb 22, 2009 at 8:05 AM, NET HE <he_net@hotmail.com> wrote:
>
>> 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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>
>
> --
> Narbik Kocharians
> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.MicronicsTraining.com <http://www.micronicstraining.com/>
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