Some of the Oracle branded optical XCVRs (135-1204-01) generate link down messages in log files. These are false link down messages, link does not go down. These messages are generated intermittently and can be ignored. Example messages in /var/adm/messages log file:
Jul 8 15:08:52 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net10 link down Jul 8 15:12:01 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net46 link down Jul 8 15:14:19 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net13 link down Jul 8 15:17:47 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net6 link down Jul 8 15:31:14 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net57 link down Jul 8 15:32:45 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net24 link down Jul 8 15:32:45 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net27 link down Jul 8 15:33:27 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net34 link down Jul 8 15:33:49 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net61 link down Jul 8 15:40:37 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net6 link down Jul 8 15:42:12 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net17 link down Jul 8 15:43:04 sca-m78-202-pd0 mac: [ID 486395 kern.info] NOTICE: net32 link down ....
Workaround: No recovery action required. There is no workaround. Check to see if switching to other XCVRs/cables fixes the issue. For the most up-to-date supported cables and part numbers, check the product web page.