Question

A storage administrator is troubleshooting suboptimal path selection in a Fibre Channel fabric. Traffic between two MDS switches is traversing a 8 Gbps ISL instead of a parallel 32 Gbps ISL. Both ISLs are in the same VSAN and are up. What is the most likely cause, and what mechanism determines the preferred FC route?

Accepted Answer

FSPF computes least-cost paths where cost is inversely proportional to link speed, but a manually configured higher interface cost on the 32 Gbps ISL is overriding the default

Answer

FSPF is selecting the higher-bandwidth link automatically; the issue must be a physical fault on the 32 Gbps ISL

Answer

FC uses STP to select the lowest-cost path, and the 8 Gbps link has the lower bridge priority

Answer

FSPF load-balances equally across all ISLs regardless of speed, so both links should carry identical traffic