Reference Guide

Policy-based Routing (PBR)

Policy-based Routing (PBR) allows a switch to make routing decisions based on policies applied to an interface.

This chapter covers the following topics:

● Overview

● Implementing Policy-based Routing with Dell Networking OS

● Configuration Task List for Policy-based Routing

● Sample Configuration

Topics:

• Overview

• Implementing Policy-based Routing with Dell Networking OS

• Configuration Task List for Policy-based Routing

• Sample Configuration

Overview

When a router receives a packet it normally decides where to forward it based on the destination address in the packet, which is

used to look up an entry in a routing table. However, in some cases, there may be a need to forward the packet based on other

criteria: size, source, protocol type, destination, etc. For example, a network administrator might want to forward a packet that

uses TCP across a different next-hop than packets using ICMP. In these situations, you can configure a switch route packets

according to a policy applied to interfaces.

Rules for PBR can also be a combination of things:

When the packet comes from this source and wants to go to that destination then route it to this next-hop or onto that specific

interface. This permits routing over different links or towards different networks even while the destination is the same but

depending on where the packet originates.

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