CTT-TAC: Controlling the Flow of BGP Updates


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Detailed Information

This module provides information on BGP4 CIDR. You learn how to apply filtering, route maps, peer groups, and more in seven lab exercises using a complex simulated network.


After completing this module, you will be able to:

  • Identify and explain the main enhancement of BGP4 classless interdomain routing (CIDR )
  • Describe aggregate addresses
  • Choose the appropriate address aggregate commands
  • Differentiate between the various types of filtering (route, path, and community)
  • Explain the purpose of route filtering
  • Illustrate the function of path filtering
  • Describe what is involved in creating an AS-regular expression
  • Recognize the benefit of community filtering
  • Demonstrate how the neighbor command can be used in conjunction with route maps to perform either filtering or parameter setting on incoming and outgoing updates
  • Identify how the as-path prepend command is used with route maps to manipulate the path information in order to manipulate the BGP decision process
  • Explain how the BGP backdoor command is used
  • Evaluate the effectiveness of a BGP peer group
  • State the purpose of BGP confederation
  • Explain how route reflectors solve the explosion of internal BGP (iBGP ) peering within an AS
  • List and define the technique of route-flap dampening and how it minimizes the instability caused by route flapping and oscillation over the network


  • Aggregate Address
  • Network Mask
  • AS-PATH and Prefix Filtering
  • BGP Backdoor
  • iBGP Peer Groups
  • eBGP Peer Groups
  • BGP Confederation
  • BGP Route Reflectors