Nexus/FEX to VSS L2 connection

[rene.builes]

I need to connect a 4500 VSS to a Nexus5500/2200 FEX (redundant mode). The FEX had BDPU guard enable by default and will error disable if a BDPU is received.  L3 channel is not an available option, but L2 channel is possible.  Here are some options I am thinking:

1) L2 channel between VSS and Nexus with an SVI terminating L3 at the VSS. Enable porttfast/bdpu filter on VSS ports so bdpu guard doesn’t error disable ports in the Nexus devices.

2) Flexlink on VSS ports to disable STP (bdpu send/receive??)

The idea is to connect the two environments at L2 (port channel or not) w/o potential L2 loop issues (bdpu filtering, etc). The nexus devices host FWs and the VSS will have a L3 SVI that the FWs will point to.

Thanks in advance.

[cassiolange]

Hello Rene, 

Hope you are doing well. 

I think the best options is connect 4500 direct to Nexus 5000. This is a valid option for you? 

Regards, 

[rene.builes]

Unfortunately that is not an option... Thanks

[cassiolange]

Hello Rene, 

This is a unsupported configuration.
On fex port disable STP, this will disable bpduguard too.

Good luck and regards,