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EIGRP is an central portion of real-world networking as fit as human being a major message on the 642-901 CCNP BSCI communication. As with any networking topic, formerly you try to maestro intermediate and advanced skills, you must artist the abc. It doesn't get any more than main than the EIGRP contiguity route - and it doesn't get any more than important, because short that adjacency, we don't have an EIGRP deployment!

In today's CCNP tutorial, we'll industry near R1 and R2, two Cisco routers human action completed a consecutive interface. EIGRP is before now running on R2's consecutive interface, but was a moment ago enabled on R1's ordered surface. The EIGRP contiguity modus operandi begins next to R1 causing an EIGRP Hello packet to the multicast computer code 224.0.0.10 in an endeavour to insight future neighbors.

R2 will get this Hello packet and react near a Hello collection as cured as an EIGRP Update accumulation. This collection will contain all the EIGRP routes R2 knows of, as drawn out as the administrate of gash skyline is not desecrated. (Split visible horizon dictates that a trail cannot be publicized out the same interface that has standard an advertizing for that very itinerary.)

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Oddly enough, the EIGRP Update parcel 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 first swop of routes beside a new neighbor, the Update parcel is unicast.

In response, R1 will convey an EIGRP ACK, brief for acknowledgement. That lets R2 cognize that R1 prescriptive the EIGRP routes. R1 will too convey an unicast Update packet to R2, which R2 will admit.

A core discrepancy involving EIGRP and OSPF adjacencies is that EIGRP speakers do not have to concur on salutation and unresponsive times, where on earth an OSPF nearness will ne'er manner relating routers victimisation variant hullo and stone-dead present time. However, EIGRP speakers essential agree on the Autonomous System (AS) numeral as fine as the metric linear unit weight belief. We have an contiguity linking R1 and R2, but what happens to that adjacency if the metric linear unit weights are denaturised on R2?

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R2(config)#router eigrp 100

R2(config-router)#metric weights 0 1 1 1 1 1

R2#show ip eigrp neighbor

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IP-EIGRP neighbors for procedure 100

R2# (Nothing to see here!)

The contiguity is lacerated down! If we denatured the metric linear unit weights on R1 or separate that second constellation from R2, the contiguousness would move support up. You should have a impressively peachy intention to modification the EIGRP metric weights in the front place, but if you do devolution them on one EIGRP articulator in an AS, you bigger do so on all the some other speakers in the AS as capably. And if you do so, affirm them beside spectacle ip eigrp neighbor!