3850 Switch - QOS

[Craig Le-Butt]

HI

We've just purchased 3850 switch part of a wireless upgrade, but we are usign 8500 wlc.

Want to use the 3580 just as a edge switch without the wlc as we didn't purchase the licences.

Using our exsiting 3750x template haing issues with the QOS settings

mls qos map cos-dscp 0 8 16 24 32 46 48 56
mls qos srr-queue input cos-map queue 2 threshold 1 3
mls qos srr-queue input dscp-map queue 2 threshold 1 24
mls qos srr-queue output cos-map queue 1 threshold 3 5
mls qos srr-queue output cos-map queue 2 threshold 1 2
mls qos srr-queue output cos-map queue 2 threshold 3 3
mls qos srr-queue output cos-map queue 3 threshold 1 1
mls qos srr-queue output cos-map queue 3 threshold 3 0
mls qos srr-queue output cos-map queue 4 threshold 3 6 7
mls qos queue-set output 2 threshold 2 3200 3200 100 3200
mls qos queue-set output 2 buffers 10 70 10 10
mls qos

any help would be apprieicated in pointing to right direction.

Have been looking for last couple of days.

cheers

[Robert Falconer]

The settings in the 3650 and 3850 follow the XE QoS design. If you do a quick search, you'll see that they now use the MQC framework.

[Ton V Engelen]

Hi

this might help (as we moved from 3750 to 3850 switches, we had to rebuild qos).

The basic idea is something like this

Class-maps:

class-map match-any CM_VOIP

match dscp ef

class-map match-any CM_SIGNALING

match ip dscp cs3

match ip dscp af31

class-map match-any VC_VIDEO

match dscp af41

Policy map for the uplink:

policy-map UPLINK-OUT

class CM_VOIP

priority level 1 percent 10 (this is the high priority queue)

police cir percent 10 conform-action transmit exceed-action drop

class CM_SIGNALING

priority level 2 percent 5 (low priority queue)

police cir percent 5 conform-action transmit exceed-action drop

class VC_VIDEO

bandwidth remaining percent 10

class class-default

bandwidth remaining percent 75

Uplink config:

Interface Gi1/1/1

Service-policy output UPLINK-OUT

This way you can build your qos policies. You can tune anyway you like / configure more traffic types and/or confighure policies for access ports

[Craig Le-Butt]

HI

thanks for this, did you have to do any changes on your distribution to get this to work?

What would be interesting if I could see your original QOS so I could better understand it, if that is OK?

cheers

[Ton V Engelen]

Hi,

1. no, we have a collapsed core, 6509 switches. For us no need to change anything there as far as qos is concerned compared to the 3750 config.

2. i do not have any backups of the old configs anymore. All gone. Sorry bout that.

But if you need any help with this let me know.