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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Filtering BGP Routes Using AS-PATH Information

To filter routes based on AS-PATH information, use these commands.

  1. Create a AS-PATH ACL and assign it a name. CONFIGURATION mode ip as-path access-list as-path-name
  2. Create a AS-PATH ACL filter with a deny or permit action. AS-PATH ACL mode {deny | permit} as-regular-expression
  3. Return to CONFIGURATION mode. AS-PATH ACL exit
  4. Enter ROUTER BGP mode. CONFIGURATION mode router bgp as-number
  5. Filter routes based on the criteria in the configured route map. CONFIG-ROUTER-BGP mode neighbor { ip-address | peer-group-name} filter-list as-path-name {in | out} Configure the following parameters:
    • ip-address or peer-group-name : enter the neighbor’s IP address or the peer group’s name.
    • as-path-name : enter the name of a configured AS-PATH ACL.
    • in: apply the AS-PATH ACL map to inbound routes.
    • out: apply the AS-PATH ACL to outbound routes.
To view which commands are configured, use the show config command in CONFIGURATION ROUTER BGP mode and the show ip as-path-access-list command in EXEC Privilege mode.

To forward all routes not meeting the AS-PATH ACL criteria, include the permit .* filter in your AS-PATH ACL.

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