Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 286
Priority-Group Configuration Notes, Configuring Priority-Based Flow Control
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• ETS is not supported on PE ports and C9010 cascade ports (member ports in the C9010 LAG created to connect to an attached C1048P). Priority-Group Configuration Notes When you configure priority groups in a DCB map: • A priority group consists of 802.1p priority values that are grouped together for similar bandwidth allocation and scheduling, and that share the same latency and loss requirements. All 802.1p priorities mapped to the same queue must be in the same priority group. • In a DCB map, each 802.1p priority must map to a priority group. • The maximum number of priority groups supported in a DCB map on an interface is equal to 3. Each priority group can support more than one data queue. • If you configure more than one priority group as strict priority, the higher numbered priority queue is given preference when scheduling data traffic. Configuring Priority-Based Flow Control Priority-Based Flow Control (PFC) provides a flow control mechanism based on the 802.1p priorities in converged Ethernet traffic received on an interface and is enabled by default when you enable DCB. As an enhancement to the existing Ethernet pause mechanism, PFC stops traffic transmission for specified priorities (Class of Service (CoS) values) without impacting other priority classes. Different traffic types are assigned to different priority classes. When traffic congestion occurs, PFC sends a pause frame to a peer device with the CoS priority values of the traffic that is to be stopped. Data Center Bridging Exchange protocol (DCBx) provides the link-level exchange of PFC parameters between peer devices. PFC allows network administrators to create zeroloss links for Storage Area Network (SAN) traffic that requires no-drop service, while retaining packetdrop congestion management for Local Area Network (LAN) traffic. To configure PFC, follow these steps. 1. Create a DCB Map. CONFIGURATION mode dcb-map dcb-map-name The dcb-map-name variable can have a maximum of 32 characters. 2. Create a priority group. CONFIGURATION mode priority-group group-num {bandwidth bandwidth | strict-priority} [[committed | peak] bandwidth [burst-size] [peak | committed] bandwidth [burst-size]] pfc {on | 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. The pfc on command enables priority-based flow control. 286 Data Center Bridging (DCB)
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