Ok here is the scenario
nexus 5548 switch ---- fex 2232 --- UCS C series (C220)
snippets of the configuration:
vlan 1100
fcoe vsan 1100
vlan database
vsan 1100
fex 100
description 2232-A
fcoe
int ethernet100/1/1
switchport
switchport mode trunk
switchport trunk allowed vlan 10,1100
interface vfc100
bind interface ethernet100/1/1
switchport trunk allowed vsan 1100
no shut
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so it is configured above, the vfc interface won't trunk unless I do the following:
vsan database
vsan 1100 interface vfc100
I found this document that describes mapping VSANs to VLANs example configuration (page 8)
