Link redundancy protects against cable cuts and port failures. Options include:
LAG (Link Aggregation): Bundle multiple physical links into one logical link. Provides bandwidth and redundancy. Uses LACP for negotiation.
Diverse paths: Run cables through different conduits, floors, or buildings. Protects against physical damage.
Multiple uplinks: Connect to different switches or routers. Eliminates switch as SPOF.
Always verify redundant paths are truly independent. Two fibers in the same conduit fail together.