I am a novice network guy. If I have missed something obvious, please let me know.
I have a N520-20G4Z-A and using SFPs only in ports 4,5,6, and 7 - Port 7 won't come up. There are no other connections to the router. The four of the ports are configured identically. I can move the SFP in port 6 (SFP link works as expected) into port 7 and port 7 will not "up up". I shut/no shut the port - no change. I move the SFP back to port 6 - light goes green (the trap is clean). Any Ideas of why?
When I put a SFP (CISCO brand) in port 7 (or any other port) the SFP is recognized correctly. Nothing in the logs state any errors (apart from my removing and inserting the SFPs). Two of the SFPs I have tried are not listed in Cisco NCS 520 Ethernet Access Devices Feature Optics Matrix but are recognized.
If a SFP is not listed on paper but recognized in the device, will it work?
Reading the N520 documentation - all of the ports should work as 1G without special licensing. I installed 4 1gb licenses on the router. No change. As a side note, the directions to install licenses on the 520 did not match the steps I had to do on my router to get the licenses installed.
Thank you for any advice on how to move forward. I have not rebooted the router, could that help?
