I'm having a similar problem. I tried connecting a P550 with a 5504 1000-SX card (or something like that) to a cisco 2950G. When I connect two cisco 2950's together they work great. When I try connecting that cisco to the p550 all I get is link on the p550 side. Nothing on the cisco.
I haven't made any changes to the default configuration on the lucent side. On the cisco 2950 I set storm control limits and enabled the port. I also set the interface for switchport mode access
I talked with someone in a new group and they brought a few things to my attention. The hardware version of the sx card in the lucent doesn't support auto negotiation. The gigabit ports on the cisco use auto negotiation. There is no way to set the speed but you can say "speed nonnegotiate" and it the port then is set at 1000-full (for the gbic that i am using).
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