FCoE Cookbook for HP Virtual Connect Version 4.20 Firmware Enhancements May 2014

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Per-Priority Flow Control commands
Make sure PFC (Per-priority Flow Control - 802.1Qbb) is enabled on the interface connected to VC. Flow Control must be
disabled. PFC ensures the lossless behavior of the FCoE traffic.
 Check the status of Flow Control; it must be turned OFF on interfaces connected to Virtual Connect.
o show interface ethernet 1/5 flowcontrol
 Check the status of the PFC. It must be turned ON on interfaces connected to Virtual Connect.
o show interface ethernet 1/5 priority-flow-control
 If the command shows “Mode” as Off or On, it should be changed to Auto.
To force PFC mode Auto on an interface, enter:
 interface ethernet 1/5
 priority-flow-control mode auto
 If the command shows “Mode” as Auto and “Oper” as Off or if the command returns
nothing, you should check the setup of the Shared Uplink Set in VCM by making sure that an
associated FCoE Network has been properly defined.