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2 - 26 ONline Ethernet 10BASE-FB Module Installation and Operation Guide
Fault-Tolerant Configurations
This section contains descriptions of the redundancy features built into the
ONline 10BASE-FB Modules. You can implement link redundancy between
concentrators using the port redundancy switch settings on the 10BASE-FB
Modules or through ONline network management.
This section contains the following topics:
❑ Configuring Ports for Fault Tolerance
❑ Implementing Total Backbone Fault Tolerance
Configuring Ports for Fault Tolerance
You can configure the 10BASE-FB Module ports in one of four different
ways:
❑ Normal Configuration – Ports 1 through 4 operate as independent
cable ports.
❑ Standard Redundant Configuration – In this configuration:
– Port 1 acts as the primary port and port 2 as the backup
for 1
– Port 3 acts as the primary port and port 4 as the backup
for 3
❑ Flexible Redundant Configuration – You can arbitrarily assign
primary and backup ports to any pair of ports. You can configure
this mode only through the advanced management commands
provided with EMM V3.0 or greater.
❑ Normal and Redundant Configuration – You can enable
redundancy between one set of ports and have the remaining two
ports operate as independent ports.