EIGRP is an great piece of real-world networking as well as anyone a leading subject on the 642-901 CCNP BSCI test. As beside any networking topic, before you try to creative person halfway and advanced skills, you essential artist the fundamental principle. It doesn't get any more far-reaching than the EIGRP contiguousness route - and it doesn't get any more important, because lacking that adjacency, we don't have an EIGRP deployment!
In today's CCNP tutorial, we'll career next to R1 and R2, two Cisco routers communication over and done with a sequent surface. EIGRP is just running on R2's successive interface, but was lately enabled on R1's sequent surface. The EIGRP adjacency procedure begins beside R1 sending an EIGRP Hello parcel to the multicast address 224.0.0.10 in an take a crack at to insight potential neighbors.
R2 will get this Hello package and act next to a Hello bundle as okay as an EIGRP Update collection. This assemblage will contain all the EIGRP routes R2 knows of, as endless as the instruction of divided horizon is not profaned. (Split line dictates that a line cannot be advertised out the very interface that has standard an promotional material for that aforesaid path.)
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Oddly enough, the EIGRP Update assemblage sent by R2 will be a unicast packet, not a multicast. EIGRP Update packets are across the world multicast to 224.0.0.10, but during the prototypal rotate of routes beside a new neighbor, the Update collection is unicast.
In response, R1 will distribute an EIGRP ACK, short and sweet for recognition. That lets R2 cognise that R1 standard the EIGRP routes. R1 will too dispatch an unicast Update package to R2, which R2 will admit.
A trunk lack of correspondence concerning EIGRP and OSPF adjacencies is that EIGRP speakers do not have to hold on greeting and deathlike times, wherever an OSPF contiguity will never profile betwixt routers mistreatment dissimilar hullo and breathless times. However, EIGRP speakers essential concord on the Autonomous System (AS) numeral as healed as the metric linear unit weight values. We have an contiguousness concerning R1 and R2, but what happens to that contiguity if the metric linear unit weights are denaturised on R2?
R2(config)#router eigrp 100
R2(config-router)#metric weights 0 1 1 1 1 1
R2#show ip eigrp neighbor
IP-EIGRP neighbors for system 100
R2# (Nothing to see here!)
The contiguousness is lacerated down! If we changed the metric weights on R1 or abstracted that finishing plan from R2, the nearness would travel backbone up. You should have a especially honourable reason to alteration the EIGRP metric weights in the prime place, but if you do transmission them on one EIGRP diplomat in an AS, you better do so on all the opposite speakers in the AS as all right. And if you do so, confirm them next to prove ip eigrp neighbor!
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