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Chapter 4 Avaya P460 Layer 2 Features
Port Redundancy Configuration
Port Redundancy Overview
Redundancy involves the duplication of devices, services, or connections, so, in the
event of a failure, the redundant duplicate can take over for the one that failed.
Since computer networks are critical for business operations, it is vital to ensure that
the network continues to function even if a piece of equipment fails. Even the most
reliable equipment might fail on occasion, but a redundant component can ensure
that the network continues to operate despite such failure.
Along with Link Aggregation Groups, which provide basic redundancy, the P460
offers an additional port redundancy scheme.
To achieve port redundancy, you can define a redundancy relationship between any
two ports in a switch. One port is defined as the primary port and the other as the
secondary port. If the primary port fails, the secondary port takes over.
You can configure up to 32 pairs of ports or LAGs per chassis: each pair contains a
primary and secondary port or LAG. You can configure any type of port to be
redundant to any other.
Secondary Port Activation
The secondary port takes over within one second and is activated when:
• The Primary port link not functioning
• The Primary port I/O module is removed
• The Primary port I/O module failed because of power down, hardware failure,
and so on.
• Subsequent switchovers take place after the "min-time-between-switchovers"
has elapsed.
Switchback
When the Primary port recovers a switch-back takes place if you have not disabled
this in management.
Switchback Parameters
• “min-time-between-switchovers” - minimum time that is allowed to elapse
before a Primary-Backup switchover
• “switchback-interval” – the minimum time the Primary port link has to be up
before a switch-back to the Primary port takes place. If you set this to “never”,
there is no switch-back to the Primary port when it recovers.
Avaya P460 Configuration Guide 31