Configuring QoS

The configuration of QoS includes the following components:

  • Port priority
  • Static MAC entries to priority queues
  • QoS marking
  • DSCP to internal forwarding priority mappings
  • VLAN priority IEEE 802.1p to hardware forwarding queue mappings
  • Queuing method
  • QoS queue naming and percentage of a port outbound bandwidth guaranteed to the queues
  • Minimum bandwidth of WRR queues
  • Bandwidth allocation for hybrid WRR and SP queues
  • Priority flow control
  • Ingress and egress buffer profile

In this section:

  1. Displaying User-Configurable Scheduler Profile Information
    Follow these steps to display configurable scheduler profile information. The information shown may be different from your profile.
  2. Changing a Port Priority
    Follow these steps to change the QoS priority of a specific port.
  3. Assigning Static MAC Entries to Priority Queues
    Follow these steps to configure a static MAC entry and assign the entry to the premium queue.
  4. Configuring DSCP and CoS Remarking at the Interface Level
    Follow these steps to configure DSCP and CoS remarking for specific ports. DSCP and CoS remarking are disabled by default.
  5. Changing the DSCP to Internal Forwarding Priority Mappings
    Follow this example to change the DSCP to internal forwarding priority mappings for all the DSCP ranges.
  6. Changing the VLAN Priority IEEE 802.1p to Hardware Forwarding Queue Mappings
    Follow this example to map a VLAN priority to a different hardware forwarding queue.
  7. Selecting the QoS Queuing Method
    Follow these steps to change the queuing method.
  8. Configuring the QoS Queue Name and Guaranteed Bandwidth
    Follow these steps to change a queue name and the minimum percentage of a port outbound bandwidth guaranteed to the queue.
  9. Changing the Minimum Bandwidth Percentages of the WRR Queues
    If you are using the weighted round robin mechanism instead of the strict priority mechanism, you can change the weights for each queue by changing the minimum percentage of bandwidth you want each queue to guarantee for its traffic.
  10. Allocating Bandwidth for Hybrid WRR and SP Queues
    Follow these steps to change the default bandwidth percentages for the queues when the device is configured to use the combined SP and WRR queuing mechanism.
  11. Enabling Priority Flow Control Globally
    Follow these steps to enable PFC globally.
  12. Enabling Priority Flow Control for a Single Priority Group
    Follow these steps to enable PFC for a single priority group (PG).
  13. Configuring the Share Queue Level for an Egress Buffer Profile
    The share level is the maximum number of buffers that a priority group (PG) can use as a portion of the total sharing pool.
  14. Configuring the Share Port Level for an Egress Buffer Profile
    The share port level for an egress buffer profile defines the maximum number of buffers that a port can use as a portion of the total memory.
  15. Configuring a Port to the Egress Queue Drop Counters
Parent topic: Quality of Service