Avaya W310 User Manual page 116

Chapter 11 W310 WLAN Gateway Layer 2 Features
Port Redundancy interworks with the Spanning Tree Algorithm.
The Port Redundancy feature functions as follows:
• Port Redundancy enables the user to establish 20 pairs of ports. Within each pair,
primary and secondary ports are defined. To prevent loops, only one port is enabled at a
time.
• Following initialization, the primary port is enabled and the secondary port is disabled.
— If the active port link fails, the system enables the secondary port.
— If the secondary port is enabled and the primary port link becomes available again,
the system will "switchback" to the primary port, unless configured otherwise by
the user.
• Two timers are available:
— min-time-between-switchovers —minimum time (in seconds) between the failure
of the primary port link and switchover to the secondary (backup) port.
The first time the primary port fails, the switchover is immediate. This timer applies to
subsequent failures.
— switchback-interval – the minimum time (in seconds) that the primary port link
has to be up (following failure) before the system switches back to the primary port.
The "none" parameter, if configured, prevents switching back to the primary.
90 Avaya W310 User's Guide