I have a new Cisco 8510 connected to a Nexus 3172. Leaving the 3K from a 40 Gig cable with a sub-interface command making it 10 Gig and going into a breakout cable. For some reason I cannot get the link to come up. I have had two TAC engineers look at this and not much feedback yet. I notice when the 40 Gig cable hits the patch panel and goes into the 10 Gig breakout cable, it goes from one send light to both lasers on one of the breakout cables. I see a send and receive. I have the N3K commands below as well as the controller config. Any information you may have, let me know.
interface port-channel105
description MP-WLC-8510
switchport mode trunk
switchport trunk allowed vlan 600,602,3000-3999
spanning-tree port type network
speed 10000
interface Ethernet1/54/1
description MP-WLC-8510
switchport mode trunk
switchport trunk allowed vlan 600,602,3000-3999
spanning-tree port type network
speed 10000
channel-group 105
