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Configuration Guide - IP Unicast Routing

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.
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Overview of Routing Policies

Overview of Routing Policies

Definition

Routing policies are used to filter routes and set route attributes. By changing the attributes of a route, a route policy can change the path that network traffic passes through.

Purpose

When advertising, receiving, and importing routes, routing protocols implement certain policies to filter routes and change the attributes of the routes based on the following networking requirements:

  • Control route receiving and advertising.

    Only required and valid routes are received or advertised. This reduces the size of the routing table and improves network security.

  • Control route importing.

    A routing protocol may import routes discovered by other routing protocols. Only routes that satisfy certain conditions are imported to meet the requirements of the protocol.

  • Modify attributes of specified routes.

    Attributes of routes that are filtered by a routing policy are modified to meet the requirements of the local device.

Benefits

Routing policies offer the following benefits:
  • System resources are saved by controlling the size of the routing table.
  • Network security is improved by controlling the route receiving, advertising and importing.
  • Network performance is improved by modifying the attributes of routes for proper traffic planning.
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Updated: 2019-04-20

Document ID: EDOC1100074760

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