Sunday, August 10, 2008

EIGRP - summarization with leak-map

R7 has three loopbacks:

172.29.17.7/24
172.29.18.7/24
172.29.19.7/24

And it is connected to a few routers including R8. You want R7 to summarize the networks but also advertise a specific route of 172.29.18.0/24 to R8. Here's how:

R7:

access-list 18 permit 172.29.18.0 0.0.0.255
!
route-map LEAK18
match ip address 18
!
int s0/0/0
ip summary-address eigrp 1001 172.29.16.0 255.255.252.0 leak-map LEAK18

Now on R8:

R8#show ip route | in 172
172.29.0.0/16 is variably subnetted, 2 subnets, 2 masks
D 172.29.16.0/22 [90/20640000] via 150.100.78.7, 00:03:31, Serial0/0/0
D 172.29.18.0/24 [90/20640000] via 150.100.78.7, 00:01:04, Serial0/0/0

Easy, eh?
posted by deadhead blues at 9:28 PM
Labels: ,

6 comments:

  1. AnonymousNovember 20, 2010 at 3:34 AM

    execellent my friends

    ReplyDelete
  2. AnonymousDecember 3, 2010 at 5:38 AM

    thanks man. you made it so easy...

    ReplyDelete
  3. AnonymousMarch 9, 2011 at 4:37 AM

    Many thanks dude, perfect explanation.
    can also be done with default route while leaking anything needed.
    int s0/0/0
    ip summary-address eigrp 1001 0.0.0.0 0.0.0.0 leak-map LEAKothers

    ReplyDelete
  4. AnonymousJune 2, 2011 at 10:53 PM

    not supported in sub interfaces

    ReplyDelete
  5. AnonymousJuly 29, 2011 at 4:33 AM

    yes on serial interface can leak route with the default route as originated

    ReplyDelete
  6. AnonymousFebruary 28, 2012 at 7:39 PM

    Leak maps are not available on sub-interfaces. You need to create a virtual-template interface to achieve this.

    ReplyDelete

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