Dell PowerEdge FX2 Dell PowerEdge FN I/O Aggregator Configuration Guide 9.6(0 - Page 194
Troubleshooting a Switch Stack, Failure Scenarios
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Troubleshooting a Switch Stack To perform troubleshooting operations on a switch stack, use the following commands on the master switch. 1. Displays the status of stacked ports on stack units. show system stack-ports 2. Displays the master standby unit status, failover configuration, and result of the last master-standby synchronization; allows you to verify the readiness for a stack failover. show redundancy 3. Displays input and output flow statistics on a stacked port. show hardware stack-unit unit-number stack-port port-number 4. Clears statistics on the specified stack unit. The valid stack-unit numbers are from 0 to 5. clear hardware stack-unit unit-number counters 5. Displays the current operational mode of the Aggregator (standalone or stacking) and the mode in which the Aggregator will operate at the next reload. show system stack-unit unit-number iom-mode Failure Scenarios The following sections describe some of the common fault conditions that can happen in a switch stack and how they are resolved. Stack Member Fails • Problem: A unit that is not the stack master fails in an operational stack. • Resolution: If a stack member fails in a daisy chain topology, a split stack occurs. If a member unit fails in a ring topology, traffic is re-routed over existing stack links. The following syslog messages are generated when a member unit fails: Dell#May 31 01:46:17: %STKUNIT3-M:CP %IPC-2-STATUS: target stack unit 4 not responding May 31 01:46:17: %STKUNIT3-M:CP %CHMGR-2-STACKUNIT_DOWN: Major alarm: Stack unit 4 down - IPC timeout Dell#May 31 01:46:17: %STKUNIT3-M:CP %IFMGR-1-DEL_PORT: Removed port: Te 4/1-32,41-48, Fo 4/ 49,53 Dell#May 31 01:46:18: %STKUNIT5-S:CP %IFMGR-1-DEL_PORT: Removed port: Te 4/1-32,41-48, Fo 4/ 49,53 Unplugged Stacking Cable • Problem: A stacking cable is unplugged from a member switch. The stack loses half of its bandwidth from the disconnected switch. • Resolution: Intra-stack traffic is re-routed on another link using the redundant stacking port on the switch. A recalculation of control plane and data plane connections is performed. 194 Stacking