QoS LAN - egress queue

Answered Question
Apr 18th, 2008

Hi !

I'm confused about witch egress queue shoud I use for voice/call_signaling...

I just read the 3560G switch guideline.. and it says:

"If the expedite queue is enabled, SRR services it until it is empty before servicing the other three queues" ...

"Each port supports four egress queues, one of which (queue 1) can be the egress expedite queue.These queues are configured by a queue-set."

This text tells that I should use the queue 1 for expedite.. but I had to use the queue 2 to accept two COS (3 5) in the command "srr-queue output cos-map queue 2 threshold 1 3 5" ...

So, first I tryied this basic marking config... whitch is working fine !

--- basic qos config ---

mls qos map cos-dscp 0 8 16 26 34 46 48 56

mls qos

class-map match-all CIPC

match access-group name CIPC

policy-map CIPC

class CIPC

set dscp ef

interface gi 0/1

service-policy input CIPC

ip access-list extended CIPC

permit udp any any range 16384 32767

permit tcp any any range 2000 2002

permit icmp any any ! for tests

---

Now I'm trying to create a priority queue for voice traffic

--- egress qos config ---

mls qos srr-queue output cos-map queue 2 threshold 1 3 5

mls qos srr-queue output dscp-map queue 2 threshold 1 24 26 46

interface gi X/Y

queue-set 2

---

1) I didn't understand why queue-set range is 1-2 ... i read that each port has 4 queues... can someone help me with that ?

2) Is this config ok ? any suggestions ? I'll improve this config step by step.

Thanks.

Andrei.

I have this problem too.
0 votes
Correct Answer by andrew.butterworth about 8 years 7 months ago

I would recommend having a read of the QoS SRND by Tim Szigeti. This has specific configurations that have been tested with Cisco VoIP so should be a good starting point.

http://www.cisco.com/go/srnd

It is the 'Enterprise QoS Solution Reference Network Design Guide Version 3.3' you want to read.

Lots of other good stuff on there as well...

HTH

Andy

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Correct Answer
andrew.butterworth Fri, 04/18/2008 - 09:07

I would recommend having a read of the QoS SRND by Tim Szigeti. This has specific configurations that have been tested with Cisco VoIP so should be a good starting point.

http://www.cisco.com/go/srnd

It is the 'Enterprise QoS Solution Reference Network Design Guide Version 3.3' you want to read.

Lots of other good stuff on there as well...

HTH

Andy

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