BGP: Filtering Subnets of a Summary using aggregate-address

Manual BGP router summarization using the aggregate-address command provides flexibility to allow none,all,or a subset of the summary’s component subnets to be advertised out of the BGP table.

  • filtering all component subnets of the summary from being advertised, using the summary-only keyword
  • advertising all the component subnets of the summary by omitting the summary-only keyword
  • advertising some and filtering other component subnets of the summary by omitting summary-only and referring to a route map using the suppress-map keyword.

 

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