NXC Series User’s Guide
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CHAPTER 10
Policy and Static Routes
10.1 Overview
Use policy routes and static routes to override the NXC’s default routing behavior in order to send
packets through the appropriate interface.
10.1.1 What You Can Do in this Chapter
•The Policy Route screens (Section 10.2 on page 178) list and configure policy routes.
• The Static Route screens (Section 10.3 on page 183) list and configure static routes.
10.1.2 What You Need to Know
The following terms and concepts may help as you read this chapter.
Policy Routing
Traditionally, routing is based on the destination address only and the NXC takes the shortest path to
forward a packet. IP Policy Routing (IPPR) provides a mechanism to override the default routing
behavior and alter the packet forwarding based on the policy defined by the network administrator.
Policy-based routing is applied to incoming packets on a per interface basis, prior to the normal routing.
How You Can Use Policy Routing
• Source-Based Routing – Network administrators can use policy-based routing to direct traffic from
different users through different connections.
• Cost Savings – IPPR allows organizations to distribute interactive traffic on high-bandwidth, high-cost
paths while using low-cost paths for batch traffic.
• Load Sharing – Network administrators can use IPPR to distribute traffic among multiple paths.
Static Routes
The NXC usually uses the default gateway to route outbound traffic from computers on the LAN to the
Internet. To have the NXC send data to devices not reachable through the default gateway, use static
routes.
Policy Routes Versus Static Routes
• Policy routes are more flexible than static routes. You can select more criteria for the traffic to match
and can also use schedules and NAT.
• Policy routes are only used within the NXC itself. Static routes can be propagated to other routers.
• Policy routes take priority over static routes. If you need to use a routing policy on the NXC and
propagate it to other routers, you could configure a policy route and an equivalent static route.
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