BGP Aggregation Unsuppress Map

Posted by September 22, 2011 in BGP

Scenario:

John and Jim are setting up their own ISP and start by configuring BGP between their routers. Because they want to make sure not to advertise too many prefixes they want to configure BGP aggregation. It’s up to you to make it happen.

Goal:

  • All IP addresses have been preconfigured for you.
  • Configure EBGP between router John and Jim. Pick whatever AS you like.
  • Advertise all loopback interfaces on router Jim in BGP.
  • Create a summary for the loopback interfaces on router Jim. Ensure you don’t have any overlapping address space.
  • Ensure you only see the summary on router John with the exception of network 172.16.2.0 /24.

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IOS:

c3640-jk9s-mz.124-16.bin

Topology:

BGP Aggregation Unsuppress Map

Video Solution:

Configuration Files

You need to register to download the GNS3 topology file. (Registration is free!)

Once you are logged in you will find the configuration files right here.

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About the Author: Rene Molenaar

René - CCIE #41726 is the creator of GNS3Vault.com where he shares CCNA, CCNP and CCIE R&S labs. He also blogs about networking on http://networklessons.com

6 Comments

  3. Hi,

    Wouldn’t an access-list accomplish the same thing? For example:
    access-list 1 permit 172.16.2.0 0.0.0.255
    !
    route-map NOTTHISONE PERMIT 10
    match ip address 1
    !
    router bgp 2
    neighbor 192.168.12.1 unsuppress-map NOTHISONE
    !
    Or is there some concept I missed? And on a non-related topic, is the RIB failure something to be concerned about when advertising networks of connecting interfaces from one router only? For example in this lab, were I to advertise the network 192.168.12.0 from only one router, the other router has an RIB failure.

    Thanks,
    Tedd

  4. Hi! Thanks for your labs Rene!

    I tried a different approach using the "
    aggregate-address 172.16.0.0 255.255.252.0 suppress-map NOTTHISONE

    route-map NOTTHISONE permit 10
    match ip address 1

    access-list 1 permit 172.16.0.0 0.0.1.255
    access-list 1 permit 172.16.3.0 0.0.0.255

    Same results that you got 🙂

    1. aggregate-address 172.16.0.0 255.255.252.0 suppress-map SUPPRESSED

      ip prefix-list UNSUPPRESS seq 5 permit 172.16.2.0/24

      route-map SUPPRESSED deny 10
      match ip address prefix-list UNSUPPRESS

      route-map SUPPRESSED permit 20
      ————————————————————————————–

      Another same result 😀

  5. I did it a little differently using a simple access-list 1 for network 172.16.2.0/24 and a match for my route-map. I don’t like using more than one WORD match to bring everything together. Makes my head hurt a little. :p

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