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As part of any enterprise class isp link aggregation appliance
the EdgeXOS incorporates full session persistence capabilities
to ensure that once a session is started that it maintains its
connection over that same link. In cases where this does not
happen an application will stop functioning.
Session persistence is especially important for SSL and cloud-based
applications as most of these types of applications are sensitive
to link hopping.
In addition to our automatic session controls, the EdgeXOS
also includes the ability to optimize link usage by preferring
specific links for specific sessions and/or the creation of
session policies.
Vector Routing
Vector Routing routes traffic between the LAN and multi-WAN
environment. This is accomplished by continuously evaluating
the metric information obtain from the WAN links, as well as
the multi-level outage detection system.
This same process is used for inbound connectivity (multi-WAN
to LAN) as well. There are some significant differences however
when inbound sessions are being balanced, particularly when
applications like VPN and VoIP are concerned. For these applications,
standard proxy services do not work well, if at all, and thus
One-to-One NAT is generally recommended.
In these cases, a Vector Map is also required in order to
ensure INBOUND session persistence, as seen in the diagram below.
Inbound sessions must be matched to their
outgoing interface. Most firewalls and core Internet routers
will drop sessions which appear to come from multiple sources.
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Enhanced
Session Policies