Automatic Failover Examples - Extreme Networks ExtremeWare 7.2e Installation And User Manual

Configuring Ports
The selection of whether a copper or fiber connection is determined by the order in which the cables are
first inserted into the switch. For example, if you inserted a SFP connector into 1X and then a Ethernet
cable into port 1, the fiber port becomes the primary uplink port and port 1 becomes the redundant
port.
Hardware determines when a link is lost and swaps the primary and redundant ports to maintain
stability. After a failover occurs, the switch keeps or sticks with the current port assignment until there
is another failure or a user changes the assignment using the CLI. To change the uplink failover
assignment, use the following command:
configure ports <nnn> preferred-medium {copper} | {fiber} |[force]
Using the option disables automatic failover. If you force the preferred-medium to fiber and the
force
fiber link goes away, the copper link is not used, even if available.

Automatic Failover Examples

If we can establish port 4 as the primary uplink and port 4X as the redundant uplink port using the
CLI:
configure ports 4 preferred-medium copper
Port 4 becomes the primary uplink until a failure occurs on that link. At that time, fiber port 4X
becomes the primary uplink and port 4 becomes the redundant port. This assignment stays in place
until the next failure. However, if the 4X port is currently the primary medium when the command is
issued, the command does not have an immediate effect.
In the next example, we force the switch to immediately start using the fiber port (if it currently has a
link):
configure ports 3 preferred-medium fiber force
In this example, port 3X becomes the only uplink port. If the preferred-medium was copper when the
command is issued, the switch immediately switches over and begins using the fiber port. If a failure
occurs on the fiber port, the switch does not use the copper port as a redundant link. To allow the
redundant uplink feature to be used again, issue this command:
configure ports 3 preferred-medium fiber
90 ExtremeWare 7.2e Installation and User Guide