To Next Page

To Previous Page

Chapter

Chapter 3: Connecting the Switch

Stack Troubleshooting and Maintenance

Linksys One Ready Communications Solution

the group, the scenario described in “Replacing a Failed Stack Master Unit in an

Operational Stack” applies.

The Master Discovery, Master Election and Unit ID Allocation & Duplicate Unit ID Conflict

Resolution processes occur with the following results:

• If the Stack Master unit remains in the split stack, the Stack Master discovers (using

the Master Discovery process) that the Master Backup unit no longer responds. The

Stack Master notifies the system administrator (using SYSLOG messages and SNMP

traps) of the removed units and ports that belong to the unreachable units and they

are reported as “not present.”

• If the Backup Master unit remains in the split stack, the Backup Master determines

this as a case of Stack Master failure and takes over and manages the remaining

units as a stack while keeping its previous Unit ID number. Because the Backup

Master was not acting as a master prior to the split, it initiates a topology database

and ports learning process. Traffic might be halted for a short period of time until

synchronization (unit and port configuration) is completed. New units discovered by

the Backup Master notify the system administrator (using SYSLOG messages and

SNMP traps).

• The partial stacks both continue to work as they did previously, but with fewer units.

• No unit ID changes are performed in each of the partial stacks.

• If each part of the stack has a Stack Master (for example, one contains the original

Stack Master, and one contains the Backup Master), and are operating as two

separate stacks, both Stack Masters contain the same configuration and use the

same IP address.

NOTE: If the stack is split in two groups, one with the

Stack Master and one with the Backup Master, both

groups will function.

NOTE: If both Stack Masters use the same IP Address,

problems can occur on the network, because users

cannot connect to one of the stacks through its IP address.

Cisco Linksys SFE2000 User Manual

Questions and Answers: