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New Member

4506 dscp mapping

When I enter on 4506 switch qos map dscp 46 to tx-queue 3 command, it looks like it is ok, but I cannot see it in configuration and sh qos map shows that dscp 46 is not mapped to tx queue. Any ideas?

System image file is "bootflash:cat4000-i9s-mz.122-25.EWA1.bin"

and these are qos general commands

qos map dscp 24 25 26 27 28 29 30 31 to tx-queue 4

qos map dscp 32 33 34 35 36 37 38 39 to tx-queue 4

qos map cos 3 to dscp 26

qos map cos 5 to dscp 46

1 ACCEPTED SOLUTION

Accepted Solutions
Purple

Re: 4506 dscp mapping

Just had another thought .. the default mapping of DSCP 46 is to queue 3. That is why you don't see the command. Remember that IOS does not display commands that are already defaults even if you do enter them explicitly.

So I believe that the behaviour is correct.

Hope that helps - pls do rate the post if it does.

Paresh

4 REPLIES
Purple

Re: 4506 dscp mapping

Hi,

Could you post the output of 'sh qos map' ?

Paresh

Purple

Re: 4506 dscp mapping

Just had another thought .. the default mapping of DSCP 46 is to queue 3. That is why you don't see the command. Remember that IOS does not display commands that are already defaults even if you do enter them explicitly.

So I believe that the behaviour is correct.

Hope that helps - pls do rate the post if it does.

Paresh

New Member

Re: 4506 dscp mapping

:-)) just found it

sh qos map

DSCP-TxQueue Mapping Table (dscp = d1d2)

d1 : d2 0 1 2 3 4 5 6 7 8 9

-------------------------------------

0 : 01 01 01 01 01 01 01 01 01 01

1 : 01 01 01 01 01 01 02 02 02 02

2 : 02 02 02 02 04 04 04 04 04 04

3 : 04 04 04 04 04 04 04 04 04 04

4 : 03 03 03 03 03 03 03 03 04 04

5 : 04 04 04 04 04 04 04 04 04 04

6 : 04 04 04 04

Policed DSCP Mapping Table (dscp = d1d2)

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

DSCP-CoS Mapping Table (dscp = d1d2)

d1 : d2 0 1 2 3 4 5 6 7 8 9

-------------------------------------

0 : 00 00 00 00 00 00 00 00 01 01

1 : 01 01 01 01 01 01 02 02 02 02

2 : 02 02 02 02 03 03 03 03 03 03

3 : 03 03 04 04 04 04 04 04 04 04

4 : 05 05 05 05 05 05 05 05 06 06

5 : 06 06 06 06 06 06 07 07 07 07

6 : 07 07 07 07

CoS-DSCP Mapping Table

CoS: 0 1 2 3 4 5 6 7

--------------------------------

DSCP: 0 8 16 26 32 46 48 56

but if I make sh qos map dscp tx

DSCP-TxQueue Mapping Table (dscp = d1d2)

d1 : d2 0 1 2 3 4 5 6 7 8 9

-------------------------------------

0 : 01 01 01 01 01 01 01 01 01 01

1 : 01 01 01 01 01 01 02 02 02 02

2 : 02 02 02 02 04 04 04 04 04 04

3 : 04 04 04 04 04 04 04 04 04 04

4 : 03 03 03 03 03 03 03 03 04 04

5 : 04 04 04 04 04 04 04 04 04 04

6 : 04 04 04 04

How can I monitor tx-queues in real time on interface? To see if cos marked packets are actually using tx 3 queue?

Purple

Re: 4506 dscp mapping

Hi,

I don't believe there is a command to show such real-time stats on the 4500...

Paresh

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