LAB: EIGRP Summarization

Like EIGRP, EIGRP supports summarization at the interface level anywhere throughout the topology, but does not have the limitation of not being able to summarize beyond the classful boundary. When a summary is configured in EIGRP all subnets that make up the summary are suppressed from being advertised out the link. Design-wise this feature can be used to both reduce the size of the routing table and to limit the scope of EIGRP query messages.


R4:
interface Serial0/0.1 point-to-point
ip summary-address eigrp 100 30.0.0.0 255.252.0.0 5
!
interface Serial0/1
ip summary-address eigrp 100 31.0.0.0 255.252.0.0 5
!
router eigrp 100
redistribute rip metric 100000 10 255 1 1500
!
router rip
redistribute eigrp 100 metric 1