|Article Number: 529886||Article Version: 4||Article Type: Break Fix|
User requested that the VxRack system be connected to their network via a 40Gb port channel broken out into 4 10Gb subinterfaces from the Nexus 9332PQ uplinks to a pair of Catalyst 6800 switches. (See diagram for detail).
When performing the network uplink task, the port channel would not come up.
Received a "port not compatible [Buffer boost]" error message.
There is a Cisco bug for this scenario, CSCux08987, but no resolution at this time. Refer to Cisco bug for complete information: https://quickview.cloudapps.cisco.com/quickview/bug/CSCux08987
The user contacted their Cisco SE. A workaround was found to configure "no buffer-boost" on all of the sub-interfaces in the Nexus 9332PQ switch. This enables the port channel to come up.