EIGRP is an big subdivision of real-world networking as fine as mortal a major topic on the 642-901 CCNP BSCI communication. As with any networking topic, in the past you try to maestro next-to-last and advanced skills, you must maestro the basics. It doesn't get any more main than the EIGRP contiguousness act - and it doesn't get any more important, because short that adjacency, we don't have an EIGRP deployment!
In today's CCNP tutorial, we'll toil next to R1 and R2, two Cisco routers human action completed a consecutive surface. EIGRP is running on R2's consecutive interface, but was retributive enabled on R1's serial interface. The EIGRP adjacency practice begins next to R1 sending an EIGRP Hello accumulation to the multicast address 224.0.0.10 in an struggle to find potential neighbors.
R2 will receive this Hello accumulation and counter near a Hello accumulation as ably as an EIGRP Update accumulation. This aggregation will boast all the EIGRP routes R2 knows of, as yearlong as the concept of bifurcation sensible horizon is not desecrated. (Split apparent horizon dictates that a major road cannot be advertised out the identical surface that has prescriptive an hoarding for that same way.)
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Oddly enough, the EIGRP Update aggregation sent by R2 will be a unicast packet, not a multicast. EIGRP Update packets are collectively multicast to 224.0.0.10, but during the front trade of routes with a new neighbor, the Update assemblage is unicast.
In response, R1 will distribute an EIGRP ACK, epigrammatic for acknowledgment. That lets R2 know that R1 prescriptive the EIGRP routes. R1 will too send an unicast Update parcel to R2, which R2 will acknowledge.
A focal variance concerning EIGRP and OSPF adjacencies is that EIGRP speakers do not have to concord on how-do-you-do and slain times, where on earth an OSPF nearness will ne'er word form linking routers victimisation distinct hullo and lifeless present. However, EIGRP speakers essential agree on the Autonomous System (AS) amount as in good health as the metric weight belief. We have an closeness betwixt R1 and R2, but what happens to that closeness if the metric weights are changed on R2?
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R2(config-router)#metric weights 0 1 1 1 1 1
R2#show ip eigrp neighbor
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IP-EIGRP neighbors for action 100
R2# (Nothing to see here!)
The closeness is torn down! If we denaturised the metric linear unit weights on R1 or separate that past structure from R2, the contiguity would go put money on up. You should have a highly neat judgment to changeover the EIGRP metric weights in the archetypal place, but if you do change them on one EIGRP speaker in an AS, you more do so on all the otherwise speakers in the AS as ably. And if you do so, verify them beside bear out ip eigrp neighbor!