Route leaking is a technique which is used together with summarization. It is used in the situations where we want to save memory by summarizing routes but still want some routes to be preffered over others for some reasons. Leak map reffernces an access-list and whatever network is permitted in the access-list will be leaked along summary route.
Topology and addressing scheme:
R1 has two point-to-point sub-interfaces going to frame-relay cloud connecting it to R2 and R3 respectively:
serial 1/0.12 : 10.1.12.1/24
serial 1/0.13 : 10.1.13.1/24
it also has three loopback interfaces:
loo 1 : 184.108.40.206/24
loo 2 : 220.127.116.11/24
loo 3 : 18.104.22.168/24
R2 has one point-to-point interface going to frame-relay cloud connecting it to R1
serial 1/0.21 : 10.1.12.2/24
R3 has one point-to-point interface going to frame-relay cloud connecting it to R1
serial 1/0.31 : 10.1.13.3/24
Eigrp has already been configured with summarization off on these routers. If you want to see the configuration it is attached with this blog.
Case 1: From R1, we want to advertise summary route and network attached to loopback 2 to R2:
Before we start, lets run a quick check. Lets have a look at Router 2 routing table:
After configuring summarization on R1
Enter configuration commands, one per line. End with CNTL/Z.
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