Cisco Cisco Nexus 5010 Switch Manuale Tecnico

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Port          STP Forwarding

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Po105         3380

As mentioned, FCoE VLANs do not participate in spanning tree and are not visible as an STP
forwarding VLAN. However they will show up as trunking. 

Priority flow control is crucial for the opertaion of FCoE. In order to have the PFC operational, the
QoS configuration should match end to end.

In order to verify the state on a per interface basis:. 

bdsol-n5548-05# show interface ethernet 1/3 priority-flow-control

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Port Mode Oper(VL bmap) RxPPP TxPPP

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Ethernet1/3 Auto On (8) 2852 13240218

The previous output shows that PFC is operational (On) and that Per Priority Pause (PPP) frames
have been both received and transmitted.

For a device-wide view the administrator can enter the show int priority-flow-control command:

bdsol-n5548-05# show int priority-flow-control

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Port Mode Oper(VL bmap) RxPPP TxPPP

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Ethernet1/1 Auto Off 4 0

Ethernet1/2 Auto Off 4 0

(...)

The interfaces which were outlined in this document, Ethernet 1/3, 1/5 and 1/6, have PFC enabled
and operational.

The corresponding configured VFCs need to be a part of the right VSAN. This example shows that
the configured virtual interfaces are part of the correct VSAN.

bdsol-n5548-05# show vsan membership

vsan 1 interfaces:

   fc2/15           

 interfaces:

   fc2/16            vfc103            vfc105            vfc106           

FCoE Initiation Protocol goes through several steps in order to bring up the link between the end
host and the switch. 

The protocol is described in