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Dell EMC Networking OS Configuration Guide for the S5048F–ON System 9.14.2.4

PDF

Creating an ETS Priority Group

An ETS priority group specifies the range of 802.1p priority traffic to which a QoS output policy with ETS settings is applied on an egress interface. Before configuring ETS, use the cam-acl l2acl 2 ipv4acl 0 ipv6acl 0 ipv4qos 2 l2qos 0 l2pt 0 ipmacacl 0 vman-qos 0 fcoeacl 2 etsacl 1 iscsi 2 command to allocate the appropriate CAM region for ETS.

  1. Configure a DCB Map.
    CONFIGURATION mode
    dcb-map dcb-map-name
    The dcb-map-name variable can have a maximum of 32 characters.
  2. Create an ETS priority group.
    CONFIGURATION mode
    priority-group group-num {bandwidth bandwidth | strict-priority} pfc off
    The range for priority group is from 0 to 7.
    Set the bandwidth in percentage. The percentage range is from 1 to 100% in units of 1%.
    Committed and peak bandwidth is in megabits per second. The range is from 0 to 100000.
    Committed and peak burst size is in kilobytes. Default is 50. The range is from 0 to 100000.
  3. Configure the 802.1p priorities for the traffic on which you want to apply an ETS output policy.
    PRIORITY-GROUP mode
    priority-list value
    The range is from 0 to 7.
    The default is none.
    Separate priority values with a comma. Specify a priority range with a dash. For example, priority-list 3,5-7.
  4. Exit priority-group configuration mode.
    PRIORITY-GROUP mode
    exit
  5. Repeat Steps 1 to 4 to configure all remaining dot1p priorities in an ETS priority group.
  6. Specify the dot1p priority-to-priority group mapping for each priority.
    priority-pgid dot1p0_group_num dot1p1_group_num ...dot1p7_group_num
    Priority group range is from 0 to 7. All priorities that map to the same queue must be in the same priority group.
    Leave a space between each priority group number. For example: priority-pgid 0 0 0 1 2 4 4 4 in which priority group 0 maps to dot1p priorities 0, 1, and 2; priority group 1 maps to dot1p priority 3; priority group 2 maps to dot1p priority 4; priority group 4 maps to dot1p priorities 5, 6, and 7.
Dell EMC Networking OS Behavior: A priority group consists of 802.1p priority values that are grouped for similar bandwidth allocation and scheduling, and that share latency and loss requirements. All 802.1p priorities mapped to the same queue must be in the same priority group.

Configure all 802.1p priorities in priority groups associated with an ETS output policy. You can assign each dot1p priority to only one priority group.

By default, all 802.1p priorities are grouped in priority group 0 and 100% of the port bandwidth is assigned to priority group 0. The complete bandwidth is equally assigned to each priority class so that each class has 12 to 13%.

The maximum number of priority groups supported in ETS output policies on an interface is equal to the number of data queues (4) (8)on the port. The 802.1p priorities in a priority group can map to multiple queues.

If you configure more than one priority queue as strict priority or more than one priority group as strict priority, the higher numbered priority queue is given preference when scheduling data traffic.

If multiple lossful priorities are mapped to a single priority group (PG1) and lossless priorities to another priority group (PG0), then bandwidth split across lossful priorities is not even.

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