QOS enabled?

Unanswered Question
Feb 4th, 2008
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Hi,

I was checking the QOS configuration of a switch and found this:


Switch>sh mls qos

QoS is disabled

QoS ip packet dscp rewrite is enabled


Can anyone tell me if QOS is in place or not? A show mls qos stats is showing the following:


Switch>sh mls qos interface fastEthernet 0/1 statistics

FastEthernet0/1


dscp: incoming

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


0 - 4 : 21693011 0 0 0 1716

5 - 9 : 0 0 0 0 0

10 - 14 : 0 0 0 0 0

15 - 19 : 0 0 0 0 0

20 - 24 : 0 0 0 0 1525566

25 - 29 : 0 78 0 0 0

30 - 34 : 0 0 0 0 0

35 - 39 : 0 0 0 0 0

40 - 44 : 0 0 0 0 0

45 - 49 : 0 11849782 0 0 0

50 - 54 : 0 0 0 0 0

55 - 59 : 0 0 0 0 0

60 - 64 : 0 0 0 0

dscp: outgoing

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


0 - 4 : 36921584 0 0 0 0

5 - 9 : 0 0 0 0 0

10 - 14 : 0 0 0 0 0

15 - 19 : 0 0 0 0 0

20 - 24 : 0 0 0 0 2321079

25 - 29 : 0 1077 0 0 0

30 - 34 : 0 0 0 0 0

35 - 39 : 0 0 0 0 0

40 - 44 : 0 0 0 0 0

45 - 49 : 0 10928282 0 8262061 0

50 - 54 : 0 0 0 0 0

55 - 59 : 0 0 0 0 0

60 - 64 : 0 0 0 0

cos: incoming

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


0 - 4 : 22016236 0 0 1525643 0

5 - 7 : 11851577 0 0

cos: outgoing

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


0 - 4 : 61787507 0 0 1261 4

5 - 7 : 365572 7115276 186724

Policer: Inprofile: 0 OutofProfile: 0






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Overall Rating: 5 (2 ratings)
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simonstoll Mon, 02/04/2008 - 00:15
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Hi


If you type "mls qos" in global mode, then you switch on all qos processing. Without that command, all DSCP and or COS markings are passed through unchanged. You can check that with ethereal/wireshark.


Simon

muca Mon, 02/04/2008 - 00:27
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Sorry Simon, I am pretty new to QOS.

So, does it mean that from "LAN" perpective all traffic will have a best effort basis?


I mean "LAN" because maybe QOS is enabled on the "provide" router?


Thanks

simonstoll Mon, 02/04/2008 - 01:20
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As long as you don't enable QOS on your switch, everything goes trough it as best effort. All markings are kept original and no special queueing based on any marking is done. Be careful in enabling QoS on your switch if your provider is using it. If you enable it without enabling some kind of trust on your ports, you will overwrite all DSCP/Precedence or COS Tags! Maby you suold ask your Provider what he is looking for.


Simon

muca Wed, 02/06/2008 - 12:51
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Hi Simon,

You mentioned "All markings are kept original and no special queueing based on any marking is done" however a show mls qos interface gig1/0/1 shows packets are being marked, so I am still not sure if it's working or not.


AGACRE01>sh mls qos interface gigabitEthernet 1/0/1 stat

GigabitEthernet1/0/1


dscp: incoming

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


0 - 4 : 4672579 0 0 0 0

5 - 9 : 0 0 0 0 0

10 - 14 : 0 0 0 0 0

15 - 19 : 0 0 0 0 0

20 - 24 : 0 0 0 0 486139

25 - 29 : 0 111044 0 0 0

30 - 34 : 0 0 0 0 0

35 - 39 : 0 0 0 0 0

40 - 44 : 0 0 0 0 0

45 - 49 : 0 6742687 0 9241 0

50 - 54 : 0 0 0 0 0

55 - 59 : 0 0 0 0 0

60 - 64 : 0 0 0 0

dscp: outgoing

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


0 - 4 : 4601322 0 0 0 0

5 - 9 : 0 0 0 0 0

10 - 14 : 0 0 0 0 0

15 - 19 : 0 0 0 0 0

20 - 24 : 0 0 0 0 837984

25 - 29 : 0 242 0 0 0

30 - 34 : 0 0 0 0 0

35 - 39 : 0 0 0 0 0

40 - 44 : 0 0 0 0 0

45 - 49 : 0 6736504 0 83660 0

50 - 54 : 0 0 0 0 0

55 - 59 : 0 0 0 0 0

60 - 64 : 0 0 0 0

cos: incoming

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


0 - 4 : 4708520 0 0 594444 0

5 - 7 : 6742677 9241 18

cos: outgoing

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


0 - 4 : 12210191 0 0 189 0

5 - 7 : 62129 64128 11695

Policer: Inprofile: 0 OutofProfile: 0


AGACRE01>

simonstoll Wed, 02/06/2008 - 23:59
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Hi


You can verify it with a packet sniffer such as Ethereal/Wireshark.


Simon

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