What traffic is too slow and where is the other endpoint?
Or is the admin access interface problem?
If there is a general connectivity with all connected devices there might be a layer 2 loop where two ports in the same vlan are accidently connected.
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Steve Puluka BSEET - Juniper Ambassador
IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
http://puluka.com/home------------------------------