Is FEX member not allowed to create port channel to extended switch?

[richter5087]

C6880(config-if)#channel-group 100 mode on
Command rejected (Port-channel100, Gi171/1/0/1): Cross-chassis bundle can have only core ports

trying to create port channel to pointed interface below with getting this error

May I know any resolution for this? or this is the limitation of fex?

Thanks in advance.

[marce1000]

          - Connecting a switch to fex port(s) is not supported  , 

 M.

[richter5087]

Thanks for the reply.

We manage to connect few switch to this fex client , we are now facing problem on creating port channel for the uplink interface to this fex client for throughput expansion.

Hope this clarifies.

[marce1000]

             - In all circumstances , connecting switches to a  fex is unsupported , 

 M.

[balaji.bandi · Accepted solution]

Nexus FEX we could able to create a Port-channel - but Looks like there is limitation here.

But you can create a Trunk if that works for you-

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/119378-technote-fex-00.html

check below :

– Configuring EtherChannels with combination of FEX Ports from different FEX-IDs or combination of FEX ports with IA parent switch linecard ports is not supported. However, FEX host port channel from the same FEX is supported

- FEX host port EtherChannel load balancing is not supported.

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-1SY/config_guide/sup2T/15_1_sy_swcg_2T/instant_access.html?bookSearch=true

[richter5087]

Thanks for the info.

Well noted.

[richter5087]

Hi Balaji.bandi,

Not really understand below, could you explain this briefly?

However, FEX host port channel from the same FEX is supported.

Thanks in advanced.

[pieterh]

>>>
C6880(config-if)#channel-group 10 mode on
Command rejected (Port-channel10, Gi171/1/0/1): Cross-chassis bundle can have only core ports
<<<
-> Po10 is already in us for the link between FEX to the 6880 ?
==>> you need at least  a different channel number for the link to the 3850

[richter5087]

Apologies for the typo.