2 - 26 ONline Ethernet 10BASE-FB Module Installati on a n d Operation Guide
Fault-Tolerant Configurations
This section contains descriptions of the redundan cy fea tures built into the
ONline 10BASE-FB Modules. Yo u can implement link redundancy betw een
concentrators using the port redundanc y switch settings on the 10BASE-FB
Modules or through ONline network manag em ent.
This section contains the following topics:
❑Configuring Ports for Fault Tolera nce
❑Implementing Total Backbone Fault Tolerance

Configuring Ports for Fault Tolerance

You can configure the 10BASE-FB Module po rts in one of four different
ways:
❑Normal Configuration – Ports 1 through 4 operate as independent
cable ports.
❑Standard Redundant Configuration – In this co nfiguration:
– 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 p orts. You can configure
this mode only through the advanced mana gement 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 .