Introduction - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing

10.1 Introduction

By configuring routing policies, you can properly use network resources.
10.1.1 Overview of the Routing Policy
By using routing policies, you can flexibly control the routes to be sent or received.
Routing Policy
Routing policies are used to filter routes and control the receiving and advertising of routes. By
changing the route attributes such as reachability, you can change the path that the traffic passes
through.
When a router sends or receives routes, it may use certain policies to filter routes. The policies
are used in the following situations:
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To implement a routing policy, you must:
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Differences Between Routing Policy and PBR
Different from the forwarding by searching the Forwarding information base (FIB) according
to the destination address of a packet, Policy-based routing (PBR) is a route selection mechanism
based on policies set by users. PBR supports the information based on the source address and
the length of a packet. PBR selects routes according to the set policy. PBR can be applicable to
security and load balancing.
Routing policies and PBR are different concepts.
two concepts.
Table 10-1 Differences between routing policy and PBR
Routing policy
Forwards packets based on the
destination address in the routing table.
Issue 02 (2014-09-30)
Send or receive routes that meet the matching rules.
A routing protocol such as the Routing Information Protocol (RIP) needs to import the
routes discovered by other routing protocols to enrich its routing information. When
importing routes from other routing protocols, the router may import certain routes that
meet the matching rules, and set attributes of the routes imported to meet the requirement.
Define a set of matching rules and setting rules. The policy is applied to the routing
information to meet the requirements of the matching rules.
Apply the matching rules to the routing policies for route advertisement, reception, and
import.
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10 Routing Policy Configuration
Table 10-1 shows the differences between the
Policy-based routing
Forwards packets based on the policy. If packets
fail to be forwarded, the device forwards packets
by searching the routing table.

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