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The Note's second example extends the first example by showing how to control server
selection for SFTP (Secure File Transfer Protocol) traffic, while still providing server
redundancy if the preferred server fails.
For simplicity, these examples provide load balancing between two servers. You can easily
expand the examples by adding more servers.
What information will you find in this document?
As outlined above, the Note first describes basic load balancer redundancy. To configure
this, do all the following steps:
•
"Configure Load Balancer 1" on page 3
•
"Configure Load Balancer 2" on page 7
•
"Create the Scripts" on page 9
Then the Note describes the optional extensions that let you control server selection. To
configure this, make all the following additions to the basic configuration:
•
"Configure Load Balancing: Extra Commands" on page 10
•
"Configure the Triggers: Extra Commands" on page 11
•
"Modify the Scripts" on page 11
•
"Create New Scripts" on page 12
Finally, the Note gives the complete extended configuration so you can verify your
configuration. Also, you may find it easier to copy this configuration to your router instead of
using the step-by-step configuration.
•
"Commands: Load Balancer 1" on page 13
•
"Commands: Load Balancer 2" on page 14
•
"File: master.scp" on page 15
•
"File: slave.scp" on page 15
•
"File: sftp1down.scp" on page 15
•
"File: sftp1up.scp" on page 15
Which products and software version does it apply to?
We created this configuration using AR440S routers and Software Version 275-05. However,
the configuration applies to the following products:
•
AR44xS and AR450S Series routers
•
AR750S, AR7x5 routers
•
Rapier i Series switches
•
AT-8800 Series switches
•
AT-9800 Series switches
It requires software version 275-05 or later (except version 276-01, which lacks the
necessary trigger functionality).
Configure Load Balancer Redundancy on Allied Telesis Routers and Switches
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