Nexus 7000 & Fex - Port-Channel problem

[maximilian.aschenbrenner]

I have redundant Nexus 7010, with several Nexus 2248 (Fex) attached.

The N2k's are already attached and running and I just started the port configuration of the N2k's.

When I tried to configure a port-channel on a Fex-port, it didn't go through and I got the message, this wasn't supported:

n7k1(config)# int e110/1/1

n7k1(config-if)# channel-group 3101

channel-group not supported for interface type

The N7k is running (the latest) software-version 5.1(3).

What am I missing? Does anyony have an explanation or solution for this?

[Ruhann Du Plessis]

Quick question. In what configuration are your FEXs attached to the N7K?

Active-active (Each FEX dual-homed to two N7Ks) or straight-through (Each FEX connected to one N7K)?

[Ruhann Du Plessis]

From looking around it seems this is a N7K software limitation, that should be allowed soon.

I can find any official documentation other than this comment by Lucien

https://supportforums.cisco.com/message/3312105#3312105

I will connect a FEX up to a N7K tommorrow and confirm if I get the same result

[maximilian.aschenbrenner]

each FEX is connected redundantly to a single N7k, the switch-redundancy for the servers comes from a second FEX in each rack, that connects to the other N7k.

I'v already been searching for any clues/documentation regarding this and didn't have any luck neither.

If you could check/confirm that on your equipment, that would be a big help, thanks..

[maximilian.aschenbrenner]

Ok, I've just been informed by our Cisco SE, that port-channels aren't supported on N2ks, connected to N7ks, yet.

Apparently, this will be supported with the upcoming v5.2.

[michgri]

Did your Cisco SE say (or can anyone else tell me) if the vPC from a single FEX to a redundant pair of Nexus 7000s will be supported in NX-OS 5.2? I believe that's considered the dual-homed FEX/active-active topology, and works when attached to a Nexus 5000.

[vldmegafondv]

Same question.

Did multi-humed FEX to Nexus 7000 (in active/active) is supported in NX-OS 5.2/6.1?

[salbrigh]

1 FEX to 2 parent 7Ks is not supported at this time with the current software releases

[David Vasquez]

What about two FEXs and one 7K? We are running version 6.2(6) and cannot create even a simple port-channel between the two FEX ethernet interfaces. I understand this should really be configured as a VPC, but since we only have one 7K there is truly no VPC Domain and the 7K sends the error "ERROR: Operation failed: [peer-keepalive not configured] " when trying to configure a VPC for those two FEX ethernet interfaces.

[Steve Fuller]

Hi David,

The problem you're facing is very similar to the issue being seen by another user who posted Port channeling a node between two 2248's in the LAN forum.

As you'll see from the link to the Nexus 7000 Fex Supported/Not Supported Topologies document, the only option with a single Nexus 7000 and two or more FEX is to use active/standby NIC teaming on the server.

Regards