[nsp] CSS and Cat.65XX GE port setting?

[Timofei Zakrewski]

Could somebody advise?

Catalyst 6506 (with WS-X6516-GBIC card) and 
CSS11506 interconnected with GE ports.

Default setting is used on GE interfaces (auto).

We see Out-Discard errors on the Cat.65XX (command show mac (CSS port))
No errors are detected on the CSS.

The possible choices on CSS GE interfaces 
  1Gbits-FD-asym            Full duplex with asymmetric pause toward link 
partner
  1Gbits-FD-no-pause      Full duplex with no pause
  1Gbits-FD-sym              Full duplex with symmetric pause
  1Gbits-FD-sym-asym    Full duplex with symmetric and asymmetric pause 
toward
                                         local device
 auto-negotiate 

Cat.65XX does not give so many choices (only set port negotiation) 

What is recommended setting for Gigabit Ethernet interconnection between 
CSS and Catalyst devices?

Thanks,
Tim