Cisco N5K-C5010P-BF Troubleshooting Guide - Page 39
How to enable link pause (flow control) on switch that connects DCBX capable devices
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Chapter 2 Troubleshooting FCoE Issues Registers and Counters Send document comments to [email protected]. How to enable link pause (flow control) on switch that connects DCBX capable devices Link pause is not enabled on the switch ports that are connected to servers. It is necessary to enable link pause (flow control) on a Nexus 5000 switch that connects DCBX-capable devices. Possible Cause If the peer supports PFC TLV with DCBX, then configuring the flowcontrol send on and the flowcontrol receive on does not enable link pause. You have to disable PFC TLV sent by DCBX on the interface. To verify this situation, perform one of the following: • Check if the operating state is off using the show interface ethx/y flowcontrol command. • Check if the operating state is on using the show interface ethx/y priority-flow-control command. Solution Use the following commands under the interface ethx/y command to enable link pause instead of PFC with DCBX capable devices: • no priority-flow-control mode on • flowcontrol receive on • flowcontrol send on How to clear PFC counters How to clear priority flow counters. Possible Cause Currently there are no CLI commands to clear PFC frames (Bug ID is CSCtg08068). Solution Although there are no CLI commands to clear the PFC counters, a workaround does exist. You can the clear interface counters and then enter the show interface ethx/x flowcontrol command to see the PFC frame count. Note The PFC frame count is incremented using the show int ethx/x flowcontrol command. This is a known bug. Registers and Counters Interface level errors To view any interface level errors, use the show interface counters errors command. Example: switch# show interface counters errors OL-25300-01 Cisco Nexus 5000 Series Troubleshooting Guide 2-15
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