Troubleshooting | 277Recovering from a Lost PasswordThe default CLI user, admin, has read/write access, with no password until you create one. Once created,the only way to recover from a lost admin password is to reload the switch using factory defaults. SeeRestoring the System to the Factory Default Configuration on page 58.Alternatively, if the user is not admin, then you can assign a new password to the user. See Creating a Userand Password on page 36.Recovering from Switch Stack ProblemsIf a master switch (management unit of a stack) fails, or if a newly added switch in a stack is notrecognized, the stacking algorithm in each S-Series switch sets the switch to automatically negotiate withconnected units to determine the stack manager and unit numbering. See Management Unit SelectionAlgorithm on page 85 and Unit Number Assignment on page 86. You can manually intervene byselectively unplugging and reconnecting switches, and by manipulating the values that appear in thealgorithm. See Adding a Switch to a Stack on page 89.When a switch cannot transmit packets to a destination stack member, you may see console messagessimilar to the following:Figure 18-262. Console Message: communication timeoutATP, in the screen capture, above, refers to the SFTOS task used for stack member communication. Thesemessages point to a communication problem with a stack member assigned an ID of d8:2e, which isderived from the last two digits of the MAC address of the switch. This condition may result from thefollowing:• Bad stacking cables or hardware components (connectors, bus...)• Improperly connected cable• Improperly seated moduleAn RPC timeout message like the following indicates a communication problem between the managementunit and the member switch with the MAC address of 0:1:e8:d5:e6:20. The communication problem in thiscase was caused by the stack cable.STACK: communication timeout to d8:2eATP: TX timeout, seq 24554. cli 778. to 1 tx cnt 21.RPC - Timeout to CPU: 0:1:e8:d5:e6:20.
