The bypass NIC in the 8880 supports auto-negotiation at 10G but does not support fixed speed at 10G.
Some 10G Base-T Ethernet interfaces do not support auto-negotiation of speed and duplex mode. These interfaces require that you disable auto-negotiation on all connecting devices. The bypass NIC in the 8880 does not support disabling auto-negotiation. Bypass mode provides important protection if the appliance malfunctions. For this reason, you should not connect the 8880 appliance to a network switch that does not support auto-negotiation.