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Designing and Expanding the Network 2 - 17
3. Use the SET PORT MODE REDUNDANT network management
command to specify which port is the primary link and which is the
backup link.
Note: If the 24-Port Modules are powered down, and then
brought back up without a 3Com network management
module present, a network loop may occur. To prevent
possibe network failure, set the DIP switch for the backup
port to disable.
Once redundancy is configured, a switchover occurs under two conditions:
❑ Link failure
❑ Port partition
The switchover occurs when the primary link fails.
A switchover back to the primary link happens automatically once the
problem is resolved.
Refer to the appropriate network management module installation and
operation guide for information on setting redundancy between 24-Port
Module ports.