Configuring QoS

Procedure
  1. Configure how local priority values are assigned to ingress packets with the commandsqos cos-map , qos dscp-map, and qos trust.
  2. If you do not want to use the default QoS profile to assign local priority values to ingress traffic, create one or more custom queue profiles with the command qos queue-profile. For each queue in a custom queue profile:
    1. Assign a local priority value with the command map queue.
    2. Optionally, define a descriptive name with the command name queue.
  3. If you do not want to use the default QoS schedule profile to determine the order in which queues are selected to transmit a packet, create one or more custom schedule profiles with the command qos schedule-profile. For each queue in a custom schedule queue profile, define scheduling priority with the commands strict queue and dwrr queue.
  4. Activate QoS settings with the command apply qos. This command lets you apply a queue profile and schedule profile globally to all interfaces, or a schedule profile override to individual interfaces.

    When applying QoS settings to a port configured to support priority-based flow control, specific configuration settings must be respected when defining a CoS map and queue profile. See the command flow-control in the ArubaOS-CX 10.04 Command-Line Interface Guide for details.

  5. Optionally, add a rate limit for ingress traffic on one or more interfaces with the command rate-limit.
  6. View QoS configuration settings with the commands show interface, show qos cos-map, show qos dscp-map, show qos queue-profile, show qos schedule-profile, and show qos trust.

Examples

This example creates the following configuration:
  • Configures CoS to be used to assign local priority to ingress packets.

  • Modifies the default CoS map to assign CoS 1 to local priority 1.

  • Creates a queue profile named Q1 and assigns local priorities as follows:
    Queue Local Priority
    0 0
    1 1
    1 2
    2 3
    3 4
    4 5
    5 6
    5 7
  • Creates a schedule profile named S1 and assigns DWRR to all queues in the schedule profile with the following weights:
    Queue Weight
    0 5
    1 10
    2 15
    3 20
    4 25
    5 50

  • Applies Q1 and S1 to all interfaces that do not have a QoS override applied. 

    switch(config)# qos trust cos
switch(config)# qos cos-map 1 local-priority 1
switch(config)# qos queue-profile Q1
switch(config)# map queue 0 local-priority 0
switch(config)# map queue 1 local-priority 1
switch(config)# map queue 1 local-priority 2
switch(config)# map queue 2 local-priority 3
switch(config)# map queue 3 local-priority 4
switch(config)# map queue 4 local-priority 5
switch(config)# map queue 5 local-priority 6
switch(config)# map queue 5 local-priority 7
switch(config)# qos schedule-profile S1
switch(config)# dwrr queue 0 weight 5
switch(config)# dwrr queue 1 weight 10
switch(config)# dwrr queue 2 weight 15
switch(config)# dwrr queue 3 weight 20
switch(config)# dwrr queue 4 weight 25
switch(config)# dwrr queue 5 weight 50
switch(config)# apply qos queue-profile Q1 schedule-profile S1