Wide Area Networks (WANs)
TransPort LR User Guide
53
WAN failover
If a WAN interface fails for any reason, the TransPort LR device automatically fails over from one WAN
interface to use another.
For example, if you use an Ethernet interface as your main WAN interface, and have a cellular
interface configured as a backup WAN interface, if the Ethernet interface was to fail (for example, if
the Ethernet cable is broken), the TransPort LR device automatically starts to use the cellular
interface until the Ethernet interface becomes active again.
IP probing
Sometimes, problems can occur beyond the immediate WAN connection that prevent some IP traffic
reaching their destination. Normally this kind of problem does not cause the WAN interface to fail, as
the connection continues to work while the core problem exists somewhere else in the network.
IP probing is a way to detect problems in an IP network. IP probing involves configuring the
TransPort LR device to send out regular IP probe packets to a particular destination. If responses to
these probe packets are not received, the TransPort LR device can bring down the WAN interface,
and switch to using another WAN interface until the IP network problem is resolved.
IP probing involves the following configuration settings:
n
The IP address or name of the host to probe
n
The size of the IP probe packets
n
The rate at which the IP probe packets are sent
n
The time, in seconds, after which the IP probe response is considered lost
n
The WAN interface timeout, in seconds, if no IP probe responses are received.
n
The time, in seconds, after which the WAN interface must receive all IP probe responses
before reactivating the WAN interface
n
The time, in seconds, after which the TransPort LR device attempts to bring up the
WAN interface
All of the IP probing configuration has default values, except for the IP address or name of the host to
probe. Use of IP probes requires this IP address. For the rest of the parameters, the default values
should be sufficient, but they can be set to different values as needed to suit your WAN failover
requirements.
Related topics
Wide Area Networks (WANs) on page 52
Example WAN failover: DSL to cellular on page 57
Show WAN status and statistics on page 59
Related commands
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