Re: FEX C2232TM interfaces remained down - uplink ports to Nexus 5K shows online

eleevercc · ‎08-05-2018

Hi Support,

Been trying to get my head around on how to get it working but still no luck.

Firstly, let me say that i am new to Nexus Technology so i only based on Cisco Articles configurations. Any help would be highly appreciated.

Basically, my issue is that i cant bring up the interfaces in my FEX (N2K-C2232), the LED indicator are still on Solid Amber even though it shows that both of my FEXs are online.

From my show interface status i could see all the interfaces but when i tried to connect to one of the interfaces, the interface doesn't seem to go up.

Basically we only have a single Nexus C5548UP that has 2 FEXs with 2 uplinks each (Port Channels)

This Nexus C5548UP is then connected to the our Core Switch. Below is the configuration details for your reference:

interface port-channel101

switchport mode fex-fabric

fex associate 101

interface Ethernet1/29

switchport mode fex-fabric

fex associate 101

channel-group 101

interface Ethernet1/30

switchport mode fex-fabric

fex associate 101

channel-group 101

interface port-channel102

switchport mode fex-fabric

fex associate 102

interface Ethernet1/31

switchport mode fex-fabric

fex associate 102

channel-group 102

interface Ethernet1/32

switchport mode fex-fabric

fex associate 102

channel-group 102

Thank you in advance!

Wes Austin · ‎08-05-2018

Are you using supported optics between the FEX and N5K?

https://www.cisco.com/c/en/us/products/collateral/switches/nexus-2000-series-fabric-extenders/product_bulletin_c25-715278.html

Do you have link lights on the ports?

eleevercc · ‎08-05-2018

Hi Wes,

Thank you for your reply, really appreciate it!

I also thought due to the Optics that i used. My 5k and 2k are just in the same rack and using 10Gbase-SR on both 5k and FEXs. I couldnt be sure if the SFPs that i used are unsupported hence i am looking at executing this command "service unsupported transciever" just to see if that would elimate the issues concerning the SFPs that i used however the command is not available hence i am planning of upgrading from 7.0(1)N1(1) to n5000-uk9-kickstart.7.1.4.N1.1.bin if that would be any of help..

and just to add on, i could see that my uplinks from 5k to FEXs are up (hence i could see my FEXs are online in my 5k) its just the interfaces of FEXs that are showing solid amber eventhough i connect an end device to any interfaces. Did a shut and unshut but still no luck

5k Transciever Details to FEXs

show int transceiver fex-fabric

Ethernet1/29

transceiver is present

type is 10Gbase-SR

name is CISCO-AVAGO

part number is SFBR-709SMZ-CS1

revision is G4.1

serial number is AVD221491JN

nominal bitrate is 10300 MBit/sec

Link length supported for 50/125um OM2 fiber is 82 m

Link length supported for 62.5/125um fiber is 26 m

Link length supported for 50/125um OM3 fiber is 300 m

cisco id is --

cisco extended id number is 4

Ethernet1/30

transceiver is present

type is 10Gbase-SR

name is OPT

part number is SFP-10G-SR

revision is 1.0

serial number is OP10T53D1033

nominal bitrate is 10300 MBit/sec

Link length supported for 50/125um OM2 fiber is 82 m

Link length supported for 62.5/125um fiber is 26 m

Link length supported for 50/125um OM3 fiber is 300 m

cisco id is --

cisco extended id number is 4

Ethernet1/31

transceiver is present

type is 10Gbase-SR

name is CISCO-AVAGO

part number is SFBR-709SMZ-CS1

revision is G4.1

serial number is AVD221491J7

nominal bitrate is 10300 MBit/sec

Link length supported for 50/125um OM2 fiber is 82 m

Link length supported for 62.5/125um fiber is 26 m

Link length supported for 50/125um OM3 fiber is 300 m

cisco id is --

cisco extended id number is 4

Ethernet1/32

transceiver is present

type is 10Gbase-SR

name is CISCO-FINISAR

part number is FTLX8571D3BCL-C2

revision is A

serial number is FNS19381XXW

nominal bitrate is 10300 MBit/sec

Link length supported for 50/125um OM2 fiber is 82 m

Link length supported for 62.5/125um fiber is 26 m

Link length supported for 50/125um OM3 fiber is 300 m

cisco id is --

cisco extended id number is 4

Cheers!

jl · ‎08-11-2018

Howdy,

What optics/speed are you using for the host facing ports on the FEX? If you have any 1000 (1GbE) ports don't forget that you will need to manually set `speed 1000` otherwise they will stay down.

Are you able to share the following outputs (Please obscure serials):

show int
show fex
show fex detail
show int fex

Could you also please flap one of the FEX interfaces and please show me the output of:

show logging log | last 50

Regards,

Jason Leschnik.