Billion Electric Company BiGuard 30 - Manual (Page 21)

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DiffServ (a.k.a. DSCP Marking) allows you to classify traffic based on IP DSCP values.
Other interfaces can match traffic based on the DSCP markings. DSCP markings are
used to decide how packets should be treated, and is a useful tool to give
precedence to varying types of data.
2.2.8 DSCP (Matching)
Just like the DSCP Marking, DSCP is used on traffics (Both inbound rules and
outbound rules have DSCP matching). DSCP matching is used to identify traffic for
the rule. (It is just like what source IP and destination IP do). When this option of the
QoS rule is selected, the QoS rule will only be applied to the packets whose DSCP
field’s IP header matches the criteria selected. These markings can be used to identify
traffic within the network.
2.3 Outbound Traffic
This section outlines some of the ways you can use BiGuard 30 to manage outbound
traffic.
2.3.1 Outbound Fail Over
Configuring BiGuard 30 for Outbound Fail Over allows you to ensure that outgoing
traffic is uninterrupted by having BiGuard 30 default to WAN2 should WAN1 fail.