If device is giving you DSCP and you like to change it to COS from egress point
of view.
Configuring the DSCP-to-CoS Map
You use the DSCP-to-CoS map to generate a CoS value, which is used to select
one of the four egress queues.
Table 33-14 shows the default DSCP-to-CoS map.
Table 33-14 Default DSCP-to-CoS Map
DSCP Value
CoS Value
0-7
0
8-15
1
16-23
2
24-31
3
32-39
4
40-47
5
48-55
6
56-63
7
If these values are not appropriate for your network, you need to modify them.
Configuring the DSCP-to-CoS Map
You use the DSCP-to-CoS map to generate a CoS value, which is used to select
one of the four egress queues.
Table 33-14 shows the default DSCP-to-CoS map.
Table 33-14 Default DSCP-to-CoS Map
DSCP Value
CoS Value
0-7
0
8-15
1
16-23
2
24-31
3
32-39
4
40-47
5
48-55
6
56-63
7
If these values are not appropriate for your network, you need to modify them.
From: [email protected]
To: [email protected]; [email protected]; [email protected]
Date: Wed, 19 Aug 2009 13:48:54 -0500
Subject: RE: [OSL | CCIE_RS] QOS question
That would lead me to believe that I can do DSCP on a switch. If that’s the
case then when would I do DSCP vs CoS?
From: desmond Black [mailto:[email protected]]
Sent: Wednesday, August 19, 2009 2:45 PM
To: Bodnar, Edward; 'prakash patel'; [email protected]
Subject: Re: [OSL | CCIE_RS] QOS question
The DSCP to DSCP mapping you refering to is actually Mutation-Map which is done
on a Trusted QOS boundary but needs change.
Example would be 2 Companies merging networks. The other company's network has
already marked the type of traffic in their own way in DSCP but then your
company has a different Policy for that traffic.
So rather than again Classifying and then marking.............you simply use a
Mutation map and do 1-to-1 mapping.Desmond Black,
In Pursuit of CCIE!!
India
----- Original Message -----
From: "Bodnar, Edward"
To: "'prakash patel'" , "[email protected]"
Subject: Re: [OSL | CCIE_RS] QOS question
Date: Wed, 19 Aug 2009 13:15:57 -0500
So any time I pass from a layer 2 device to a layer 3 device I need to
translate the CoS to DSCP. And any time I go from a layer 3 device to layer 2
device I need to translate DSCP to CoS? If this is true then why do that have
DSCP to DSCP translations in switches ?
From: prakash patel [mailto:[email protected]]
Sent: Wednesday, August 19, 2009 2:09 PM
To: Bodnar, Edward; [email protected]
Subject: RE: [OSL | CCIE_RS] QOS question
Layer 2 devices connection ...USE COS
LAYER 3 devices use DSCP.
From: [email protected]
To: [email protected]
Date: Wed, 19 Aug 2009 13:01:01 -0500
Subject: [OSL | CCIE_RS] QOS question
When would I use CoS over DSCP or DSCP over CoS.
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