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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
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Configuring an AS_Path Filter

Configuring an AS_Path Filter

Context

An AS_Path filter is used to filter routes based on the AS_Path attributes of BGP routes. If you do not want to receive routes of a specified AS number, configure an AS_Path filter based on the specified AS number. On a complex network, multiple ACLs or IP prefix lists must be configured to filter BGP routes. This can be a complicated process; configuring an AS_Path filter can simplify the configuration.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ip as-path-filter { as-path-filter-number | as-path-filter-name } { permit | deny } regular-expression

    An AS_Path filter is configured.

    In the preceding command, regular-expression indicates that the AS_Path filter uses a regular expression to define matching rules. For further details about regular expressions, see "CLI Overview" in the Huawei AR Seriesrouter - Configuration Guide - Basic Configuration.

Verifying the Configuration

  • Run the display ip as-path-filter [ as-path-filter-number | as-path-filter-name ] command to check information about a configured AS_Path filter.

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Updated: 2019-05-20

Document ID: EDOC1100034072

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