Dell C9010 Modular Chassis Switch EMC Networking Command-Line Reference Guide - Page 561

Usage Information Example For each priority, you can specify the shared buffer threshold limit, the ingress buffer size, buffer limit for pausing the acceptance of packets, and the buffer offset limit for resuming the acceptance of received packets. When PFC detects congestion on a queue for a specified priority, it sends a pause frame for the 802.1p priority traffic to the transmitting device. You can use the priority command to set up both the administrative and peer-related PFC priorities. For example, you can configure the intended buffer configuration for all eight priorities. If you configure the number of lossless queues as 4 and if the administrator-configured priorities configured within the DCB input policy is applied, then the configuration for those priorities are pre-designed. However, if the peer-provided priorities are applied, although a DCB input policy is present, the peer-provided priorities become effective for buffer configuration. This method of configuration provides an easy and flexible technique to accommodate both administratively-configured and peer-configured priorities. Dell(conf-dcb-buffer-thr)#priority 0 buffer-size 52 pause-threshold 16 resume-offset 10 shared-threshold-weight 7 qos-policy-buffer Create a QoS policy buffer and enter the configuration mode to configure the no-drop queues, ingress buffer size, buffer limit for pausing, and buffer offset limit for resuming. . C9000 Series Syntax Parameters qos-policy-buffer queue queue-num pause no-drop queue buffer-size size pause-threshold threshold-value resume-offset threshold-value sharedthreshold-weight size policy-name Name of the QoS policy buffer that is applied to an interface for this setting to be effective in conjunction with the DCB input policy. You can specify the shared buffer threshold limit, the ingress buffer size, buffer limit for pausing the acceptance of packets, and the buffer offset limit for resuming the acceptance of received packets. This method of configuration enables different peer-provided and administrative priorities to be set up because the intended queue is directly configured instead of determining the priority to queue mapping for local and remote parameters. queue 0 to queue Specify the queue number to which the QoS policy buffer parameters apply 7 pause Pause frames to be sent at the specified buffer limit levels and pause packet settings no-drop The packets for this queue must not be dropped value Enter a number in the range of 0 to 7 to denote the priority to be allocated to the dynamic buffer control mechanism buffer-size Ingress buffer size size Size of the ingress buffer in KB. Enter a number in the range of 0 to 7787. The default is 45 KB. pause-threshold Buffer limit for pause frames to be sent threshold-value Buffer limit at which the port sends the pause to peer in KB. Enter a number in the range of 0 to 7787. The default is 10 KB. resume-offset Buffer offset limit for resuming in KB threshold-value Buffer offset limit at which the port resumes the peer in KB. Enter a number in the range of 1 to 7787. The default is 10 KB. shared- Buffer shared threshold weight threshold-weight Data Center Bridging (DCB) 561