Connecting a 3928 to a 8700

Discussion created by ikim Advocate on Aug 10, 2018
Latest reply on Aug 12, 2018 by hausmus

FYI, hope this will help you save some time if you are in the same situation.


We were trying to connect a 1G optical SFP port on the 8700 20x10G card to a 1G optical SFP port on a 3928, and it did not come up right away. After some port show troubleshooting, we realized that the default auto-neg on the 8700 is "off" and the default auto-neg on the 3928 is "on". Once we switched the 8700 port to auto-neg "on", the circuit came up. Why different Ciena switches have different default auto-neg values I have no idea, since the 8700 and 3928 are relatively new switches. Maybe the 3928 still has ex-WWP people developing it, and the 8700 has ex-Nortel people developing it. It would be nice if all Ciena switches were consistent in their default settings.