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CloudEngine 12800 and 12800E V200R005C10 Configuration Guide - IP Unicast Routing

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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(Optional) Configuring the Format of BGP 4-Byte AS Numbers

(Optional) Configuring the Format of BGP 4-Byte AS Numbers

Context

By default, a BGP 4-byte AS number is displayed in dotted notation (x.y). To use integral 4-byte AS numbers, perform this configuration task to display 4-byte AS numbers as integers.

Assume that a 4-byte AS number in dotted notation is x.y. Following is the conversion relationship between an integral 4-byte AS number and a 4-byte AS number in dotted notation:

Integral 4-byte AS number = x x 65536 + y

For example, if a 4-byte AS number in dotted notation is 2.3, the corresponding integral 4-byte AS number is 131075 (2 x 65536 + 3).

Changing the format of 4-byte AS numbers will affect matching results of AS_Path regular expressions and extended community attribute filters. Therefore, if the system is using an AS_Path regular expression or an extended community attribute filter as an import or export policy, you must reconfigure an AS_Path regular expression using the ip as-path-filter command or an extended community attribute filter using the ip extcommunity-filter command after changing the format of 4-byte AS numbers. This reconfiguration ensures that routes match the import or export policy.
  • If integral 4-byte AS numbers are configured, you must change 4-byte AS numbers in AS_Path regular expressions and extended community attribute filters to integral 4-byte AS numbers.
  • If 4-byte AS numbers in dotted notation are configured, you must change 4-byte AS numbers in AS_Path regular expressions and extended community attribute filters to 4-byte AS numbers in dotted notation.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run as-notation plain

    BGP 4-byte AS numbers are configured to display as integers.

    After you run the as-notation plain command, BGP 4-byte AS numbers are displayed as integers in display commands but are still displayed in dotted notation in the configuration file.

  3. Run commit

    The configuration is committed.

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Updated: 2021-09-17

Document ID: EDOC1100075354

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