Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 278
Applying an ETS Output Policy for a Priority Group to an Interface, Applying an
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The range is from 0 to 7. The default is none. 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. Dell 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 (refer to Applying an ETS Output Policy for a Priority Group to an Interface). 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) 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. Applying an ETS Output Policy for a Priority Group to an Interface To apply ETS on egress port traffic, you must associate a priority group with an ETS output policy which has scheduling and bandwidth configuration in a DCB output policy, and then apply the output policy to an interface. 1. Create a DCB output policy to associate an ETS configuration with priority traffic. CONFIGURATION mode dcb-output policy-name The maximum is 32 alphanumeric characters. 2. Enable the ETS configuration so that scheduling and bandwidth allocation configured in an ETS output policy or received in a DCBx TLV from a peer can take effect on an interface. 278 Data Center Bridging (DCB)
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