Outbound Link Load Balancing
Outbound LLB (OLLB) is used when you want redundancy across multiple routes for traffic leaving
the ADC. One prerequisite for OLLB is that all gateways configured into an OLLB group must be
able to route traffic to the same set of destinations.
In order to distribute outbound traffic from your servers, you must define links by defining its
gateway. You will also need to configure one or more health checks that will monitor the
availability of the link so that Equalizer can avoid links that are down.
The illustration below shows how OLLB functions:
If you want Equalizer to avoid links that are not available, or links that do not have complete
routes to crucial IP addresses, you will need to enable link health checks. Each link health check
will periodically send Layer 3 ICMP ECHO probe (pings) from the Equalizer interface IP to an IP
address that must be reachable in order for the link to be determined to be available. This can be
any IP address, such as a main office, core router, server, cluster or virtual server at another
data center.These probes are configured on the gateways (See
"Configuring Outbound Link Load
on page 496 and
"Configuring Inbound Link Load Balancing"
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
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