User manual

Network Setup
60
The SG unit supports a wide range of configurations through which you can utilize
multiple Internet connections, and even multiple
SG units, to help ensure Internet availability in
the event of service outage or heavy network
load.
The following Internet availability services are
provided by the SG unit. They may be
configured individually, or in combination.
• Internet Failover: configuring a back up,
redundant Internet connection (or
connections) that is only established should the primary link lose connectivity
• Load Balancing: establishing another Internet connection (or connections)
concurrently with the primary link, for spreading network load over multiple
connections
• High Availability: installing a back up, redundant SG unit to monitor the status of the
primary unit, coming online and becoming the Internet gateway for your network
should the primary SG unit fail
Note
SG unit models SG300, SG530 and SG550 are limited to Internet availability
configurations using a single broadband Internet connection and a single dialout or ISDN
connection.
Configure Internet connections
Configure all Internet connections to use in conjunction with the SG unit’s Internet
availability services. Secondary and tertiary Internet connections are configured in the
same manner as the primary Internet connection, as detailed in the sections entitled
Direction Connection, ADSL, Cable Modem, and Dialout/ISDN earlier in this chapter.
Note
If you are using a SG unit model SG560, SG565 or SG580, you may want to skip ahead
to the section entitled Port Based VLANs later in this chapter, for information on
establishing multiple broadband connections.