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BGP Max AS Limit

Written by Rene Molenaar on . Posted in BGP

Scenario:

AsianFish inc. is expanding their business towards Europe so they need to expand their network as well. BGP has been configured for inter-AS connectivity but you want to make sure you don't receive just any prefix on the Internet. Business has been fishy lately so there's no budget for routers with enough memory to carry all the BGP prefixes. To make sure your routers keep running you only want to accept prefixes from a number of autonomous systems.

Goal:

  • All IP addresses have been preconfigured for you.
  • Configure EBGP between AS 1 - 2, AS 2 - 3 and AS 3 - 4.
  • Advertise the loopback0 interfaces of all routers in BGP.
  • Configure router Tilburg so it only allows prefixes from directly connected autonomous systems.
  • You are not allowed to use as path filtering or any regular expressions.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

BGP Max AS Limit

Video Solution:

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Comments (4)

  • avatar
    SteveOcchO86
    2011-09-26 01:24:24

    I assume they want you to the bgp maxas-limit command, if so pretty simply but the same thing can be with an ORF.

  • avatar
    ReneMolenaar
    2011-09-26 23:07:31

    Yup that's the trick. Not a hard lab but it'll teach you this feature. I'm walking down all the different CCIE R&S commands and this is one of them.

  • avatar
    farhand1@gmail.com
    2012-04-01 20:48:33

    Debug ip bgp update ....Always good to capture debug outputs

    Mar 1 00:23:33.835: BGP(0): 192.168.23.2 rcv UPDATE about 1.1.1.0/24DENIED due to: AS-PATH length over 4072;

    Tilburg

    bgp maxas-limit 1

    Thanks for the awesome lab Rene. U made the life easier to practice BGP labs :-)

  • avatar
    ReneMolenaar
    2012-04-02 08:43:40

    Using a debug like this is excellent to verify your work...your welcome :)