Dell C1048P Port Extender Networking Command-Line Reference Guide for the C900 - Page 678

Version 9.7(0.0) 9.3(0.0) Description Introduced on the S6000-ON. Introduced on the S4810, S4820T, and S6000 platforms. Usage Information 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 peerrelated 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. Example Dell(conf-dcb-buffer-thr)#priority 0 buffer-size 52 pausethreshold 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 buffersize size pause-threshold threshold-value resume-offset threshold-value shared-threshold-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. 678 Data Center Bridging (DCB)