To set link redundancy between two Security Modules:

1.Connect two links to two ports on the 50-Pin Telco cables between the modules. Use a crossover adapter between each link because the links are designed to be connected to a station's port, not to other concentrator ports.

2.Use the SET PORT {slot.port} MODE REDUNDANT {slot.port} network management command to specify which port is the primary link and which is the backup link.

Note: If the Security Modules are powered down, and powered up without a 3Com network management module present, a network loop could occur. To prevent a potential network failure, set the DIP switch for the backup port to disable.

3.Once link redundancy is configured, a switchover occurs under two conditions: a link failure or a port partition. The switchover occurs when the primary link fails.

4.Once the switchover occurs and the backup link becomes operational, a switchover back to the primary link happens automatically once the problem is resolved.

Note: If you use a Security Module port as a backbone connection ensure that Security Mode is disabled for the port or it will experience security intrusion attempts.

Refer to the appropriate network management module installation and operation guide for information on setting redundancy between Security Module ports.

Designing and Expanding the Network 2 - 13

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3Com 5112M-TPLS installation and operation guide Designing and Expanding the Network 2