Administrator Guide

---------------------------------------STANDBY
UNIT------------------------------------------
10:55:18: %STKUNIT1-M:CP %KERN-2-INT: Error: Stack Port 50 has flapped 5 times within 10
seonds.Shutting down this stack port now.
10:55:18: %STKUNIT1-M:CP %KERN-2-INT: Error: Please check the stack cable/module
and power-cycle the stack.
Master Switch Recovers from Failure
• Problem: The master switch recovers from a failure after a reboot and rejoins the stack as the standby unit or member unit.
Protocol and control plane recovery requires time before the switch is fully online.
• Resolution: When the entire stack is reloaded, the recovered master switch becomes the master unit of the stack.
Stack Unit in Card-Problem State Due to Incorrect Dell Networking OS Version
• Problem: A stack unit enters a Card-Problem state because the switch has a dierent Dell Networking OS version than the
master unit. The switch does not come online as a stack unit.
• Resolution: To restore a stack unit with an incorrect Dell Networking OS version as a member unit, disconnect the stacking
cables on the switch and install the correct Dell Networking OS version. Then add the switch to the stack as described in Adding
a Stack Unit. To verify that the problem has been resolved and the stacked switch is back online, use the show system
brief command.
Dell#show system brief
Stack MAC : 00:1e:c9:f1:00:9b
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
--------------------------------------------------------------------------
0 Management online I/O-Aggregator I/O-Aggregator 8-3-17-46 56
1 Standby
card problem I/O-Aggregator unknown 56
2 Member not present
3 Member not present
4 Member not present
5 Member not present
Card Problem — Resolved
Dell#show system brief
Stack MAC : 00:1e:c9:f1:04:82
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
----------------------------------------------------------------------
0 Management online I/O-Aggregator I/O-Aggregator 8-3-17-52 56
1 Standby
online I/O-Aggregator I/O-Aggregator 8-3-17-52 56
2 Member not present
3 Member not present
4 Member not present
5 Member not present
Stack Unit in Card-Problem State Due to Conguration Mismatch
• Problem: A stack unit enters a Card-Problem state because there is a conguration mismatch between the logical provisioning
stored for the stack-unit number on the master switch and the newly added unit with the same number.
• Resolution: From the master switch, reload the stack by entering thereload command in EXEC Privilege mode. When the
stack comes up, the card problem will be resolved.
Upgrading a Switch Stack
To upgrade all switches in a stack with the same Dell Networking OS version, follow these steps.
1. Copy the new Dell Networking OS image to a network server.
2. Download the Dell Networking OS image by accessing an interactive CLI that requests the server IP address and image
lename, and prompts you to upgrade all member stack units.
EXEC Privilege mode
Stacking
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