Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 124
Configuring Lossless Queues, Prerequisite
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www.dell.com | support.dell.com Configuring Lossless Queues DCB also supports the manual configuration of lossless queues on an interface when PFC mode is turned off and priority classes are disabled in a DCB input policy applied to the interface. The configuration of no-drop queues provides flexibility for ports on which PFC is not needed but lossless traffic should egress from the interface. Lossless traffic egresses out the no-drop queues. Ingress dot1p traffic from PFC-enabled interfaces is automatically mapped to the no-drop egress queues. Prerequisite: A DCB input policy with PFC configuration is applied to the interface with the following conditions: • PFC mode is off (no pfc mode on). • No PFC priority classes are configured (no pfc priority priority-range). To configure lossless queues on a port interface, follow these steps: Step 1 2 Task Enter INTERFACE Configuration mode. Configure the port queues that will still function as no-drop queues for lossless traffic. For the dot1p-queue assignments, refer to Table 8-1. Maximum number of lossless queues globally supported on the switch: 2. Valid values: 0-3. Separate queue values with a comma; specify a priority range with a dash; for example: pfc no-drop queues 1,3 or pfc no-drop queues 2-3 Default: No lossless queues are configured. Command interface type slot/port pfc no-drop queues queue-range Command Mode CONFIGURATION INTERFACE FTOS Behavior: By default, no lossless queues are configured on a port. A limit of two lossless queues are supported on a port. If the amount of priority traffic that you configure to be paused exceeds the two lossless queues, an error message is displayed. You must reconfigure the input policy using a smaller number of PFC priorities. If you configure lossless queues on an interface that already has a DCB input policy with PFC enabled (pfc mode on), an error message is displayed. Traffic may be interrupted due to an interface flap (going down and coming up) when you reconfigure lossless queues on no-drop priorities in an input policy and re-apply the policy to an interface. 122 | Data Center Bridging (DCB)
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