G'day Hologic,
Not that we run Nortel switches, but we also had a lot of grief with one client using an IBM Blade centre, until they turned off Autoneg
I can't recall if this was the exact post.

https://www-304.ibm.com/systems/supp...andind=5000020

Sorry I can'r be more specific, but the onsite IT guys hndled this, so it is just from my memory.
HTH.

Rgds Ben