
Command Line Interface
2.12
Failover Configuration Mode
2.12.1 Overview
The EXN400 offers a failover mechanism on OC-3 and Gigabit Ethernet
interfaces:
On OC-3 interfaces, it supports SONET Automatic Protection Switching
(APS) protocol. In this release, only 1+1 mode is available.
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•
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On Gigabit Ethernet interfaces, it supports a protection mechanism,
based on physical link status or periodic ping, between two interfaces.
To enable failover between several interfaces of the same type, a failover
group is created. Any interface involved in the failover group is added to the
group. One interface is defined as the protection channel, the other
interfaces are defined as working channels.
When a failure is detected on a working channel, the failover module
automatically switches on the protection channel and any data is routed to
the new channel.
For Ethernet, when the working channel is repaired, the failover module
does not attempt to switch back on the working channel.
If a failure is detected on the protection channel, the failover module
attempts to switch back on the working channel.
An interface can be added to a group as the protection channel only if this
interface is not bound to anything (neither abridge nor a management). In
addition, the interface that is added to a failover group as the protection
channel is no longer available for configuration nor display.
Any interface belonging to the failover group and defined as a working
channel can be configured for management or bridging as usual, that is,
from the corresponding interface configuration mode.
2.12.2 Entering
Mode
To create a failover group, from the Global Configuration mode, use the
failover
command:
For Gigabit Ethernet interfaces
failover gigabitEthernet flvr_name
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