Dell PowerEdge XL 5133-4 MXL 10/40GbE Switch IO Module FTOS Command Reference - Page 231
Failure Scenarios, Stack Member Fails, Unplugged Stacking Cable
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Figure 17-27. show hardware stack-unit stack-port Command Example FTOS# show hardware stack-unit 1 stack-port 33 Input Statistics: 7934 packets, 1049269 bytes 0 64-byte pkts, 7793 over 64-byte pkts, 100 over 127-byte pkts 0 over 255-byte pkts, 7 over 511-byte pkts, 34 over 1023-byte pkts 70 Multicasts, 0 Broadcasts 0 runts, 0 giants, 0 throttles 0 CRC, 0 overrun, 0 discarded Output Statistics: 438 packets, 270449 bytes, 0 underruns 0 64-byte pkts, 57 over 64-byte pkts, 181 over 127-byte pkts 54 over 255-byte pkts, 0 over 511-byte pkts, 146 over 1023-byte pkts 72 Multicasts, 0 Broadcasts, 221 Unicasts 0 throttles, 0 discarded, 0 collisions, 0 wredDrops Rate info (interval 45 seconds): Input 00.00 Mbits/sec, 0 packets/sec, 0.00% of line-rate Output 00.00 Mbits/sec, 0 packets/sec, 0.00% of line-rate 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: FTOS#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 FTOS#May 31 01:46:17: %STKUNIT3-M:CP %IFMGR-1-DEL_PORT: Removed port: Te 4/1-32,41-48, Fo 4/ 49,53 FTOS#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 a another link using the redundant stacking port on the switch. A recalculation of control plane and data plane connections is performed. Stacking | 217