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The Connect from Intel Pro/1000 T to 1000base-t Port on Catalyst 4000 (WS-X4412-2GB-T= module) Not Working Properly

The connect from Intel Pro/1000 T to 1000base-t port on Catalyst 4000 (WS-X4412-2GB-T= module) is not working properly. The Intel Pro/1000 T NIC connects to a 10/100 OK. Auto-negotiation is set at both ends. We can successfully ping across the link. However performance is so poor as to make the connection unusable.


Re: The Connect from Intel Pro/1000 T to 1000base-t Port on Cata

When an Intel Pro/1000 T NIC is connected to a Catalyst switch, the customer may see poor network connections or excessive numbers of dropped packets. The problem arises when a module with a TBI interface transmits an odd byte packet to a receiver with a Gigabit Media Independent Interface (GMII).

The interoperability issue is a result of the implementation of Carrier Extension. Carrier Extension is detailed in sub section in the IEEE 802.3 specification. Carrier Extension can be used to pad the last byte of a packet, so the packet is aligned on an even numbered boundary.

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