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3850 QoS question

Answered Question
Dec 26th, 2013
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Hello,

I am trying to upgrade from 3750 to 3850. Following is my outbound WTD qos config on 3750:

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

mls qos srr-queue output cos-map queue 2 threshold 1 2 4

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

mls qos srr-queue output cos-map queue 2 threshold 3 6 7

mls qos srr-queue output cos-map queue 3 threshold 3 0

mls qos srr-queue output cos-map queue 4 threshold 3 1

mls qos srr-queue output dscp-map queue 1 threshold 3 46

mls qos srr-queue output dscp-map queue 2 threshold 1 16 18 20 22 32 34 36 38

mls qos srr-queue output dscp-map queue 2 threshold 2 24 26 28 30

mls qos srr-queue output dscp-map queue 2 threshold 3 48 56

mls qos srr-queue output dscp-map queue 3 threshold 3 0

mls qos srr-queue output dscp-map queue 4 threshold 1 8

mls qos srr-queue output dscp-map queue 4 threshold 3 4 10 12 14


mls qos queue-set output 1 threshold 2 70 80 100 100

mls qos queue-set output 1 threshold 4 40 100 100 100


What will be the equivalent config for the 3850? I am not able to find the right documentation for 3850.

Following is what I created but I believe it wouldnt handle WTD.


class-map match-any EF

match dscp ef

class-map match-any CS3AF41

match dscp cs3 af41

class-map match-any AF21

match dscp af21

class-map match-any AF11

match dscp af11

class-map match-any Default

match dscp default


policy-map QOS-OUTBOUND

class EF

   priority level 1

class CS3AF41

   priority level 2

class AF21

   bandwidth remaining percent 20

   shape average percent 100

class AF11

   bandwidth remaining percent 20

   shape average percent 100

class Default

   bandwidth remaining percent 60

   shape average percent 100


Also, when I try to apply this to an interface, it accepts it but its not visible under show runn. Am I missing anything?

I would appreciate any help with this.


Thank you.

Correct Answer by Rasika Nayanajith about 3 years 7 months ago

Hi,


3850 is not supporting MLS QoS (so any QoS commands start with mls keyword is not applicable in this switch platform- even thoug they are accepted).


It is a MQC QoS based switch platform (like 6500,4500). There are few Queing models (1P7Q3T, 2P6Q3T for wired &  2P2Q for wireless) supported in this platform. Please refer below post for more detail

http://mrncciew.com/2013/12/23/3850-qos-part-2-queuing-models/


Based on this you need to derive your config changes. As you can see in the above "queue limit x " is the command used to configure WTD for non-priority queues (ie Q2 to Q6)


Regarding running config, you can use "show running-config all" command to see all the configuration lines of your switch including default configs



HTH

Rasika


***Pls rate all useful responses ****

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Correct Answer
Rasika Nayanajith Sat, 12/28/2013 - 14:40
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  • Cisco Designated VIP,

    2017 Wireless

Hi,


3850 is not supporting MLS QoS (so any QoS commands start with mls keyword is not applicable in this switch platform- even thoug they are accepted).


It is a MQC QoS based switch platform (like 6500,4500). There are few Queing models (1P7Q3T, 2P6Q3T for wired &  2P2Q for wireless) supported in this platform. Please refer below post for more detail

http://mrncciew.com/2013/12/23/3850-qos-part-2-queuing-models/


Based on this you need to derive your config changes. As you can see in the above "queue limit x " is the command used to configure WTD for non-priority queues (ie Q2 to Q6)


Regarding running config, you can use "show running-config all" command to see all the configuration lines of your switch including default configs



HTH

Rasika


***Pls rate all useful responses ****

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