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Designing and Expanding the Network 2 - 13
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.