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SonicOS 5.8.1 Administrator Guide
Policy Based Routing
A simple static routing entry specifies how to handle traffic that matches specific criteria, such
as destination address, destination mask, gateway to forward traffic, the interface that gateway
is located, and the route metric. This method of static routing satisfies most static requirements,
but is limited to forwarding based only on destination addressing.
Policy Based Routing (PBR) allows you to create extended static routes to provide more flexible
and granular traffic handling capabilities. SonicOS Enhanced PBR allows for matching based
upon source address, source netmask, destination address, destination netmask, service,
interface, and metric. This method of routing allows for full control of forwarding based upon a
large number of user defined variables.
A metric is a weighted cost assigned to static and dynamic routes. Metrics have a value
between 0 and 255. Lower metrics are considered better and take precedence over higher
costs. SonicOS Enhanced adheres to Cisco defined metric values for directly connected
interfaces, statically encoded routes, and all dynamic IP routing protocols.
Route Policies Table
You can change the view your route policies in the Route Policies table by selecting one of the
view settings in the View Style menu.
Metric Value Description
1 Static Route
5 EIGRP Summary
20 External BGP
90 EIGRP
100 IGRP
110 OSPF
115 IS-IS
120 RIP
140 EGP
170 External EIGRP
Internal BGP