Dell Brocade 6520 Command Reference Supporting Fabric OS v7.1.0 - Page 653

portBufferShow 2 portBufferShow Displays the buffer usage information for a port group or for all port groups in the switch. SYNOPSIS portbuffershow [[slot/]port] DESCRIPTION Use this command to display the current long distance buffer information for the ports in a port group. The port group can be specified by giving any port number in that group. If no port is specified, then the long distance buffer information for all of the port groups of the switch is displayed. The following long distance information is displayed: User Port Index number of the port. Port Type E (E_Port), F (F_Port), G (G_Port), L (L_Port), or U (U_Port). Lx Mode Long distance mode. L0 Link is not in long distance mode. LE Link is up to 10 km. LD Distance is determined dynamically. LS Distance is determined statically by user input. Max/Resv Buffers The maximum or reserved number of buffers that are allocated to the port based on the estimated distance (as defined by the desired_distance operand of the portCfgLongDistance command). If the port is not configured in long distance mode, certain systems might reserve buffers for the port. This field then displays the number of buffers reserved for the port. Avg Buffer Usage & FrameSize The average buffer usage and average frame size for Tx and Rx. Buffer Usage The actual number of buffers allocated to the port. In LD mode, the number is determined by the actual distance and the user-specified desired distance (as defined by the desired_distance operand of the portCfgLongDistance command). Needed Buffers The number of buffers needed to utilize the port at full bandwidth (depending on the port configuration). If the number of Buffer Usage is less than the number of Needed Buffers, the port is operating in the buffer limited mode. Link Distance For L0 (not in long distance mode), the command displays the fixed distance based on port speed, for instance: 10 km (1 Gbps), 5 km (2 Gbps), 2 km (4 Gbps), or 1 km (8 Gbps). For static long distance mode (LE), the fixed distance of 10 km displays. For LD mode, the distance in kilometers displays as measured by timing Fabric OS Command Reference 625 53-1002746-01