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How to advertise an aggregate or summary route in BGP on the S-Series

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TitleHow to advertise an aggregate or summary route in BGP on the S-Series
Objective
  • Summarize BGP routes being advertised
  • Suppress supporting routes from being advertised
Environment
  • S-Series
Procedure
In order to advertise a summary route you can use the "aggregate route" feature.  This command will advertise a summary route such as 10.0.0.0/8 when a more specific route (10.10.10.0/24) is present in the BGP table.  You can add a summary option to the command which will suppress advertisement of the more specific routes and only advertise the larger 10.0.0.0/8 route.  Normally redistribution or a bgp network statement would be used to populate the BGP table with the support routes.

Example configuration
 router bgp 1234
  aggregate-address 10.0.0.0/8 summary 
  log-up-down
  network 10.0.0.0/8
  exit

 
Additional notes
  • When advertising any summary route we recommend a matching blackhole route be configured to prevent any routing loops from occurring
  • Outbound BGP filters could also be used to suppress unwanted BGP network advertisements.

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