Technical Documentation

Configuring BGP to Ignore Path Attributes

You can configure BGP to ignore one or more path attributes from BGP updates during inbound processing. The path attributes that you specify will not be examined by the software. In addition, any optional non-transitive attributes will be dropped, while transitive attributes will be treated as unknown optional transitive attributes and passed along in outgoing BGP advertisements.

Note: If you configure path attribute 128 (attribute set) and you have at least one VRF routing instance configured with an independent domain, the attribute set will be processed as usual (and not ignored).

Note: You can also configure BGP attributes to be dropped. If you configure path attributes to be both dropped and ignored, they will always be dropped because the drop-path-attributes statement takes precedence over the ignore-path-attributes statement.

To configure BGP to ignore path attributes:

  1. Configure a BGP group.
    [edit]user@host# set configuration protocols bgp group g1
  2. Configure the path attributes to ignore by specifying the path attribute codes.
    [edit configuration protocols bgp group g1]user@host# set ignore-path-attributes [ 128 113 50 ]
  3. (Optional) Explicity configure BGP neighbor options to be different from the group options.
    [edit protocols bgp group g1]user@host# set neighbor 1.1.3.2 peer-as 2 local-as 1
  4. Verify the configuration by checking the output of the show bgp neighbor command.

Published: 2010-07-02

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