Ø Less number of OOB connection
> FEX Doesn't support Private VLANs
> Any port available on FEX cannot be SPAN destination port
> FEX Model like 2148 Can't be associated with Nexus 7K
> So far only FEX model 2232PP supports FCOE on FEX ports
> On Nexus 7k, the non-default VDC gets access to FEX feature only if
feature is installed and enabled under default VDC
> In Nexus 7-K all the uplinks and host ports of a Fabric Extender
belong to a single VDC. The ports cannot be allocated or split
among multiple VDCs.
> Nexus 7k F1 modules are though Layer 2 cards, but still doesn't support
> You can configure the Fabric Extender host interfaces as edge
ports only.The interface is placed in an error disabled state if a
downstream switch is detected.
> The Cisco Nexus 2148 Fabric Extender does not support frames
with the dot1p vlan 0 tag
And here is most interesting one. Just take a look at Pic below.
Actually you are looking at Back (rear) side of Nexus 2000 FEX,
and default Air-flow is from front to back.
7k Fex Command Ref:
5k Fex Command Ref:
2k NX-OS Software Rel 6.1 Configuration Guide:
2k Cisco Nexus 2000 NX-OS Software Rel 5.2 Configuration Guide:
Cisco Nexus 5000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.2:
Nexus 2k Airflow: