Verify switch port configuration If optical attenuation is normal but the link still fails, check the switch port settings: • Some switches use combo SFP/RJ45 ports, which require manual optical port configuration. • Some ports are multi-rate multiplexed (e., 25G/10G shared. This document describes how to troubleshoot fiber optic interfaces by addressing some of the fiber optic module and cabling specifications. There are no specific requirements for this document. This includes Doppler. This is for Layer 1 connectivity, if the link shows "up/up," but expected traffic is not passing, other configuration issues may be present. Verify that the transceivers and cables at both ends are seated properly and right side up. For example. The issue appears to be between the switches, but as I said, the Fibre has been tested, the SFPs have been swapped, the switches are reporting Link, but they're dumb switches so there's no way to check anything more on them. I have problem with optical link (1000SX) on Cisco Catalyst 9300 (C9300-48T). Confuguretion this port: Onother swicth C9200 connects to this port Te1/1/3.
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