Users Guide

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 40000.
Committed and peak burst size is in kilobytes. Default is 50. The range is from 0 to 10000.
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 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) 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.
ETS Operation with DCBx
The following section describes DCBx negotiation with peer ETS devices.
In DCBx negotiation with peer ETS devices, ETS configuration is handled as follows:
• ETS TLVs are supported in DCBx versions CIN, CEE, and IEEE2.5.
• The DCBx port-role configurations determine the ETS operational parameters (refer to Configure a DCBx Operation).
• ETS configurations received from TLVs from a peer are validated.
• If there is a hardware limitation or TLV error:
○ DCBx operation on an ETS port goes down.
○ New ETS configurations are ignored and existing ETS configurations are reset to the default ETS settings.
• ETS operates with legacy DCBx versions as follows:
○ In the CEE version, the priority group/traffic class group (TCG) ID 15 represents a non-ETS priority group. Any priority group
configured with a scheduler type is treated as a strict-priority group and is given the priority-group (TCG) ID 15.
○ The CIN version supports two types of strict-priority scheduling:
▪ Group strict priority: Use this to increase its bandwidth usage to the bandwidth total of the priority group and allow a single
priority flow in a priority group. A single flow in a group can use all the bandwidth allocated to the group.
▪ Link strict priority: Use this to increase to the maximum link bandwidth and allow a flow in any priority group.
Data Center Bridging (DCB)
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