Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 288
Configuring Enhanced Transmission Selection, Creating an ETS Priority Group
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Any pfc-dot1p priorities configured on a given interface need not be the same across the system, until the total lossless queues configured on all the ports does not exceed the maximum lossless queues configured globally. For example, one of the Te/Fo interfaces can have pfc-dot1p priorities as 2 and 3. Whereas, the other Te/Fo interface(s) can have its pfc-dot1p priorities as 4 and 5. It is the user responsibility to have symmetric PFC configurations on the interfaces involved in a particular PFC-enabled traffic-flow to obtain lossless behavior. Configuring Enhanced Transmission Selection ETS provides a way to optimize bandwidth allocation to outbound 802.1p classes of converged Ethernet traffic. Different traffic types have different service needs. Using ETS, you can create groups within an 802.1p priority class to configure different treatment for traffic with different bandwidth, latency, and best-effort needs. For example, storage traffic is sensitive to frame loss; interprocess communication (IPC) traffic is latencysensitive. ETS allows different traffic types to coexist without interruption in the same converged link by: • Allocating a guaranteed share of bandwidth to each priority group. • Allowing each group to exceed its minimum guaranteed bandwidth if another group is not fully using its allotted bandwidth. 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. 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} [[committed | peak] bandwidth [burst-size] [peak | committed] bandwidth [burst-size]] 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 40000. Committed and peak burst size is in kilobytes. Default is 50. The range is from 0 to 10000. 3. Repeat Step 2 to configure all remaining dot1p priorities in an ETS priority group. 4. Specify the dot1p priority-to-priority group mapping for each priority. priority-pgid dot1p0_group_num dot1p1_group_num ...dot1p7_group_num 288 Data Center Bridging (DCB)
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