VSP 7024 to Allied Telesis AT-x550-18XSQ via SFP+ MMF

[GuidoB]

Hi, a customer wants to connet a vsp 7024xls to an Allied Telesis AT-x550-18XSQ via SFP+ MMF. Fibre connection stays in down state. Patch Cable and SFP+ modules, changed, but no connection and no information in Log files. All ERS switches are connected succesfully.
Has anyone done this already?

[FredrikB1]

Hi!

Assuming fibers and SFP types match and are OK, you should check the auto negotiation settings, mainly speed and duplex but also auto-polarity. I've had some issues with Allied switches that will not come up if those are on auto on both sides. I can't remember what settings and which side we had to change (perhaps both) but that solved our problems.

/Fredrik