Nexus 5010 cant associate to 2148T fabric extender

Answered Question
Jan 14th, 2010

Hi There,

We have a Nexus 5010 (N5K-C5010P-BF version n5000uk9.4.0.1a.N1.1.bin) and are trying unsuccessfully to associate a fabric extender 2148T (N2K-2148T-1GE.

We are using the guide for the 2148T as detailed at the following location;

When trying to configure the 5010 for the interface connected to the 2148T we do not get "fex-fabric" as a configurable option under "switchport"

Switch(config)# int eth 1/17

Switch(config-if)# switchport mode ?

      access    port mode access

      trunk       port mode trunk

Switch(config-if)# switchport mode fex-fabric


% invalid command detected at ' ^ ' marker.


Any ideas what we are missing - possible global command to allow fex-fabric to become an option ?

Thanks in advance for any assistance.

Correct Answer by Ganesh Hariharan about 7 years 1 month ago

Hi Jim,

Following command was introduce in 4.0(1a)N2(1) check out the below link from cisco hope that helps out your query !!



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Jim Bell Thu, 01/14/2010 - 04:54

Thanks Ganesh.H

That looks promising.

However I am now having issues trying to upgrade the 5010 to an image that supports the switchport fex-fabric command.

The 5010 is on bench test without any network connectivity and we were trying to upgrade unsuccessfully via mgmt 0 interface

Laptop ( connected on same subnet can ping and telnet to the 5010 mgmt 0 interaface (, however the 5010 is unable to

ping or tftp back to the laptop comes up with "No route to Host" even though we had added one as per instructions at

Have I missed something or is there any other way to upgrade the 5010 image



Jim Bell Thu, 01/14/2010 - 06:42

Update on issue of tftp transfer is now resolved - had to specify vrf to use for tftp transfer as below;

Enter vrf (If no input, default vrf is considered): management

bagaumer Fri, 03/05/2010 - 14:45

Don't forget to enable "feature fex" from global config.  See below for essentials:

feature fex

fex 100
  pinning max-links 1
  description first_nexus_2148t
  type "Nexus 2148T"

interface port-channel100
  switchport mode fex-fabric
  fex associate 100

interface Ethernet1/19
  switchport mode fex-fabric
  fex associate 100
  channel-group 100

interface Ethernet1/20
  switchport mode fex-fabric
  fex associate 100
  channel-group 100


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