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EIGRP Stub Leak Map

Written by Rene Molenaar on . Posted in EIGRP

Scenario:

You are enjoying life as a lifeguard and parttime network administrator. Just like real life your routers cry out for help by sending queries whenever they have lost a certain network. You decide to implement EIGRP Stub routing and only allow some of the networks to be advertised. Now you have another problem...people are complaining about reachability..up to you to be there and fix it!

Goal:

  • All IP addresses have been preconfigured for you.
  • Router Yasmine has a loopback interface:
    Loopback0: 3.3.3.3 /24
  • Router Carmen has 2 loopback interfaces:
    Loopback0: 4.4.4.4 /24
    Loopback1: 44.44.44.44 /24
  • Configure router Yasmine so only the directly connected networks are advertised towards the neighbors.
  • Router David and Pamela should have 4.4.4.0 /24 in their routing table, learned from EIGRP.
  • 44.44.44.0 /24 is not allowed to be in the routing table of router David and Pamela.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

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EIGRP Stub Leak Map

Video Solution:

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Comments (6)

  • avatar
    ethan
    2010-12-03 21:45:59

    Hello,
    I am stuck somewhat with this lab. How would you make David and Pamela learn 4.4.4.0/24 through EIGRP when Yasmine is configured only to advertise connected interfaces? Some hint would be great ;D

  • avatar
    martek
    2010-12-05 00:51:30

    eigrp stub leak-map LEAKMAP1

    ip prefix-list LEAK seq 5 permit 4.4.4.0/24
    access-list 10 permit 4.4.4.0 0.0.0.255

    route-map LEAKMAP1 permit 10
    match ip address 10

  • avatar
    ReneMolenaar
    2010-12-05 11:03:33

    Hi Ethan,

    I hope the solution from Martek helps you out. Normally a stub is "everything or nothing" but with the leak map you can have a few routes as an exception and they will be advertised anyway.

  • avatar
    ncjasen
    2010-12-21 20:44:57

    Is both the prefix list and access list needed in order to allow/deny a leak-map?

  • avatar
    ReneMolenaar
    2010-12-21 22:07:30

    Well actually you don't....you need a prefix list or an access-list.

    The Leak map refers to a route-map. With the route-map you can "match" on access-list or prefix-list.

  • avatar
    Ollie
    2011-07-21 14:11:16

    Top-notch ... had to look at the solution in the end , I thought a leak-map was a ACL ... doh ! Good route-map practice. Love the way you did it other way route-map then fill in ACL so much more common sense. Using show access-list & show route-map simultaneously is a good tip so you can see both on screen together.