6.5 Configuring IPv4 IS-IS Route Selection
Configuring IS-IS route selection can achieve refined control over route selection.
6.5.1 Establishing the Configuration Task
Before configuring IPv4 IS-IS route selection, familiarize yourself with the applicable
environment, complete the pre-configuration tasks, and obtain the data required for the
configuration. This will help you complete the configuration task quickly and efficiently.
Applicable Environment
After basic IPv4 IS-IS functions are configured, IS-IS routes will be generated, enabling
communication between different nodes on a network.
If multiple routes are available, a route discovered by IS-IS may not the optimal route. This does
not meet network planning requirements nor facilitates traffic management. Therefore, configure
IPv4 IS-IS route selection to implement refined control over route selection.
To implement refined control over IPv4 IS-IS route selection, perform the following operations:
l Configuring the IPv4 IS-IS Interfaces.
NOTE
Changing the IS-IS cost for an interface can achieve the function of controlling route selection, but
requires routes on the interface to be recalculated and reconverged when a network topology changes,
especially on a large-scale network. In addition, the configuration result may not meet your
expectation.
Therefore, the configuration of changing IS-IS costs has best to be finished when configuring basic
IS-IS functions.
l Configure IPv4 IS-IS route leaking.
l Configure principles for selecting equal-cost IPv4 IS-IS routes.
l Filter IPv4 IS-IS routes.
l Configure an overload bit for an IPv4 IS-IS device.
Pre-configuration Tasks
Before configuring IPv4 IS-IS route selection, complete the following tasks:
l Configuring IP addresses for interfaces to ensure that neighboring nodes are reachable at
the network layer
l Configuring Basic IPv4 IS-IS Functions
Data Preparation
To configure IPv4 IS-IS route selection, you need the following data.
No.
Data
1 ACL for filtering routes, IP prefix list, or routing policy
S6700 Series Ethernet Switches
Configuration Guide - IP Routing 6 IS-IS Configuration
Issue 01 (2012-03-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
260
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