To isolate the a1 or b1 fc link, Quiesce the i/o on the a1 or b1 fc link path, Break the connection by uncabling the link – Sun Microsystems 6900 User Manual
Page 68: Insert a loopback connector into the switch port, Rerun switchtest, B. if switchtest fails again, replace the switch, Insert a loopback connector into the hba, Run qlctest, A. if the qlctest test fails, replace the hba, B. if the qlctest test passes, replace the cable

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