C93180YC-FX switchport mode E on VFC interface

[Tim Johnson]

Migrating from C5548UP to C93180YC-FX.   I have fcoe and npiv features enabled.   I am trying to configure a VFC interface with "switchport mode E" and obtain error "vfc6: (error) configuration of this port mode not allowed"

Configuration is as follows:

interface Ethernet1/6
description /// FCoE Uplink to N5k-DC-B ///
switchport
switchport mode trunk
switchport trunk allowed vlan 1,3121
no shutdown

interface vfc6
bind interface Ethernet1/6
switchport trunk allowed vsan 3121
switchport description // FCoE Link to N5k-DC-B //
no shutdown

On the C5548UP it is configured as follows:

interface Ethernet1/6
description /// FCoE Uplink to N5k-DC-B ///
switchport mode trunk
switchport trunk allowed vlan 1,3121

interface vfc6
bind interface Ethernet1/6
switchport mode E
switchport trunk allowed vsan 3121
switchport description // FCoE Link to N5k-DC-B //
no shutdown

What am I missing?

Thanks.

[Tim Johnson · Accepted solution]

Found my answer in the 9.3(x) config guide, a single line buried in the fiber channel interface config steps that states "vFC interfaces support only F mode".   Not mentioned anywhere else, though the command is available on the switch just with the generic error.  Now on to re-engineering this component.