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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Setting the AS_Path Attribute

Setting the AS_Path Attribute

The AS_Path attribute is used to prevent routing loops and control route selection.

Procedure

  • Configure MBGP not to compare the AS_Path attribute in the route selection process.
    1. Run system-view

      The system view is displayed.

    2. Run bgp as-number

      The BGP view is displayed.

    3. Run ipv4-family multicast

      The BGP-IPv4 multicast address family view is displayed.

    4. Run bestroute as-path-ignore

      MBGP is configured to ignore the AS_Path attribute in route selection.

  • Configure the AS_Path attribute to carry only the public AS number.
    1. Run system-view

      The system view is displayed.

    2. Run bgp as-number

      The BGP view is displayed.

    3. Run ipv4-family multicast

      The BGP-IPv4 multicast address family view is displayed.

    4. Run peer { ipv4-address | group-name } public-as-only [ force [ replace ] [ include-peer-as ] | limited [ replace ] [ include-peer-as ] ]

      The AS_Path attribute is configured to carry only the public AS number.

      The number of an AS ranges from 1 to 4294967295. A public AS number ranges from 1 to 64511, and from 65536 (1.0 in the x.y format) to 4294967295 (65535.65535 in the x.y format); a private AS number ranges from 64512 to 65534; the AS number 65535 is reserved for particular use.

      Public AS numbers can be used on the Internet. They are assigned and managed by the Internet Assigned Number Authority (IANA). Private AS numbers cannot be advertised to the Internet. They are used only within ASs.

      Usually, routes advertised among MBGP peers carry the AS number information. The AS number may be a public AS number or a private AS number. If the private AS number does not need to be advertised, this command can be run to allow the AS_Path attribute to carry only the public AS number.

    5. Run commit

      The configuration is committed.

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Updated: 2019-01-03

Document ID: EDOC1100055017

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