Cisco 4507R to HP 6600 Switch

Hi all,

Probably something I've missed but here goes....

I have an new Blade environment that I've connected to my existing LAN. The new environment is switched through 2 (for redundancy) HP 6600 switches and each of those is trunked back to my LAN from a 1 port to a 10Gb port on redundant Supervisor Engines on a Cisco 4507R (One switch, multiple ports)

I updated the firmware on one of the 6600s earlier and during the reboot cycle, I lost connectivity from Cisco side to HP side.

I tried to create a Port Channel for the 2 ports on the Cisco but lost connectivity, is there anything I can do to enable this configuration to work correctly?

Thanks