CTT-TAC: BGP Multipath and Conditional Advertisement


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Detailed Information

In this module, you will learn how to enable the multipath feature to provide load balancing and how to control route advertisement using the conditional advertisement feature. Two labs allow you to gain hands-on practice applying the concepts you learn.


After completing this module, you will be able to:

  • Recognize how BGP inserts multiple paths to the IP routing table
  • For conditional advertisement, show how BGP advertises routes from its BGP table to external peers (peers in different ASs) by default
  • Demonstrate how route-maps and other filters allow you to permit or deny the conditional advertisement of selected routes
  • Recognize how the BGP conditional advertisement feature provides additional control of route advertisement
  • Utilize the conditional advertisement feature command neighbor advertise-map non-exist-map and to track routes by the route prefix
  • Explain why the conditional advertisement feature uses only partial routes to advertise to each provider, and why the size of the global BGP table is not increased with redundant information
  • State why AS path list information cannot be used for conditional advertisement


  • BGP Multipath
  • Conditional Advertisement