How to configure egress queuing on a Cisco Catalyst 3560

Here is an example of how to configure egress queuing on a Cisco Catalyst 3560.

***I use the 10,10,60,20 method on the LAN. You may want to adjust it to fit your needs.
10% = Priority traffic (For me, Voice)
10% = Network Management (Voice Control, Network management like SSH, RDP, SNMP etc..)
60% = Business critical traffic
20% = Everything else



**Your COS to Queue mappings may need adjusting depending on your needs. I found these to work just fine for me.

mls qos Enables QOS on the switch
mls qos map cos-dscp 0 8 16 24 32 46 48 56 Sets the COS-DSCP values
mls qos srr-queue output cos-map queue 1 threshold 3 5  COS 5, in Q1, Threshold 3
mls qos srr-queue output cos-map queue 2 threshold 2 6 7  COS 6,7, in Q2, Threshold 2
mls qos srr-queue output cos-map queue 2 threshold 3 4  COS 4, in Q2, Threshold 3
mls qos srr-queue output cos-map queue 3 threshold 3 3  COS 3, in Q3, Threshold 3
mls qos srr-queue output cos-map queue 4 threshold 1 2  COS 2, in Q4, Threshold 1
mls qos srr-queue output cos-map queue 4 threshold 3 0 1  COS 0,1, in Q4, Threshold 3

Cos-dscp map:
cos:     0   1   2   3   4   5  6    7
—————————————-
dscp: 00 08 16 24 32 46 48 56

Interface configuration

interface range FastEthernet1/1 – # END USER PORTS
srr-queue bandwidth share 10 10 60 20 Allocates Bandwidth per queue in Percent
 srr-queue bandwidth shape 10 0 0 0 Max bandwidth on priority queue
priority-queue out Enables Priority queue

 

 

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About Scape

Over 10 Years in the networking field. Have worked in the Service provider and Enterprise environments. I have worked with Cisco, Foundry/Brocade, F5, Riverbed, Scientific Atlanta, Routers, Switches, Firewalls, Load Balancers, WAN Accelerators, DWDM, SONET, Multicast etc...

One thought on “How to configure egress queuing on a Cisco Catalyst 3560

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