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DES-7200 Configuration Guide Chapter 7 Policy-based Routing
Configuration
7-1
7 Policy-based Routing
Configuration
7.1 Overview
7.1.1 Introduction to Policy-based Routing
Policy-based Routing offers a more flexible packet routing forwarding mechanism
than destination address-based routing forwarding, which enables you to route
IPv4/v6 packets by elements like source address, destination address, port
number and packet length.
In general, user networks apply different bandwidths from different ISPs. To
ensure resources for important users, the system needs to selectively forward
packets rather than fording packets by the general routing table. In this case,
policy-based routing comes into being to take full advantages of ISP resources
and satisfy the flexible and diversified applications.
7.1.2 Basic Concepts and Features
7.1.2.1 Application Process
Creating the routing map is necessary for application of policy-based routing. A
routing map consists of many policies with corresponding sequence. Smaller
sequence means higher priority.
Each policy consists of one or more match statements and corresponding one or
more set statements. The match statement defines the matching rule of IPv4/v6
packets, and the set statement defines the processing rules of matched IPv4/v6
packets. In the course of policy-based routing, packets are matched by priorities
in descending order. Once a policy is matched, the system performs
corresponding actions and quits policy-based routing.
Policy-based routing for IPv4 packets uses standard or extended ACL as
matching rule. Policy-based routing for IPv6 packets, however, uses extended
ACL as matching rule. For IPv6 packets, only one match ipv6 address can be
configured a policy at most.