On the Nexus 5000, the default load balancing mechanism on the LACP port-channel is source-destination. If we leave it in this state, all the FCoE traffic will take the same link in the port channel when the Nexus 5000 is forwarding frames to the upstream device.
To enable the Nexus 5000 to load balance using exchange IDs, we configure it for ‘source-dest-port’ load balancing.
Nexus5000(config)# port-channel load-balance ethernet ?
destination-ip   Destination IP address
destination-mac  Destination MAC address
destination-port Destination TCP/UDP port
source-dest-ip   Source & Destination IP address   ——–> SID/DID
source-dest-mac  Source & Destination MAC address
source-dest-port Source & Destination TCP/UDP port ——–> SID/DID/OXID
source-ip        Source IP address
source-mac       Source MAC address
source-port      Source TCP/UDP port