Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 1081

If three consecutive packets are lost, an error message is logged and then one of the following happens: • The RPM-SFM runtime loopback test failure initiates an SFM walk whenever it is enabled, feasible and necessary. The system automatically places each SFM (in sequential order) in an offline state, runs the loopback test, and then places the SFM back in an active state. This continues until the system determines a working SFM combination. If no working combination is found, the system restores to the pre-walking SFM state and the switch fabric state remains up. No more SFM walks are conducted as long as the SFM settings remain unchanged (setting changes include SFM reset, power off/on, and hotswap). However, the runtime loopback tests will continue with failure messages being logged every five minutes. Note: SFM walking assumes a chassis with the maximum number of SFMs in an active state. The loopback runtime test results reflect the overall health status of the dataplane. SFM walking can help to identify a single faulty SFM which is persistently dropping all traffic. For any partial packet loss, the loopback test results can only indicate that there is partial packet loss on the dataplane. When an automatic SFM walk is conducted, events are logged to indicate the start and completion of the SFM walk and the results. A complete system message set is shown below. FTOS Behavior: In very rare circumstances, FTOS is not able to recover from a SFM loopback failure. You must recover manually from the loopback failure, by power-cycling the SFM. Refer to Power the SFM on/off. Message 1 SFM walk message example %TSM-2-RPM_LOOPBACK_FAIL: RPM-SFM dataplane loopback test failed %TSM-2-SFM_WALK_START: Automatic SFM walk-through started %TSM-6-RPM_LOOPBACK_PASS: RPM-SFM dataplane loopback test succeeded %TSM-2-BAD_SFM_DISABLED: Bad SFM in slot 0 detected and disabled %TSM-2-SFM_WALK_SUCCEED: Automatic SFM walk-through succeeded • An SFM walk will not be able to identify multiple faulty SFMs, faulty linecards, or faulty RPM. In this case, the following event is logged. Message 2 SFM walk Event Log %TSM-2-RPM_LOOPBACK_FAIL: RPM-SFM dataplane loopback test failed %TSM-2-SFM_WALK_START: Automatic SFM walk-through started %TSM-2-SFM_WALK_FAIL: Automatic SFM walk-through failed to identify single faulty SFM E-Series TeraScale Debugging and Diagnostics | 1081