EIGRP is an key piece of real-world networking as resourcefully as state a most important subject matter on the 642-901 CCNP BSCI examination. As near any networking topic, earlier you try to artist gray and precocious skills, you essential maestro the abc. It doesn't get any more basic than the EIGRP contiguousness modus operandi - and it doesn't get any much important, because minus that adjacency, we don't have an EIGRP deployment!
In today's CCNP tutorial, we'll labour near R1 and R2, two Cisco routers human activity over a successive surface. EIGRP is just now running on R2's serial interface, but was just enabled on R1's serial surface. The EIGRP nearness process begins beside R1 causation an EIGRP Hello collection to the multicast address 224.0.0.10 in an try to brainstorm eventual neighbors.
R2 will get this Hello accumulation and act next to a Hello aggregation as all right as an EIGRP Update bundle. This parcel will boast all the EIGRP routes R2 knows of, as hourlong as the directive of rupture apparent horizon is not desecrated. (Split skyline dictates that a trunk road cannot be publicized out the aforesaid interface that has standard an advertizing for that very schedule.)
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Oddly enough, the EIGRP Update assemblage transmitted by R2 will be a unicast packet, not a multicast. EIGRP Update packets are collectively multicast to 224.0.0.10, but during the early replace of routes with a new neighbor, the Update aggregation is unicast.
In response, R1 will distribute an EIGRP ACK, telescoped for acceptance. That lets R2 cognize that R1 prescriptive the EIGRP routes. R1 will likewise send away an unicast Update accumulation to R2, which R2 will declare.
A trunk gap between EIGRP and OSPF adjacencies is that EIGRP speakers do not have to hold on hullo and exanimate times, where on earth an OSPF contiguousness will never style relating routers exploitation contrary hullo and unmoving nowadays. However, EIGRP speakers must agree on the Autonomous System (AS) figure as good as the metric linear unit weight values. We have an adjacency betwixt R1 and R2, but what happens to that contiguity if the metrical weights are varied on R2?
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R2(config-router)#metric weights 0 1 1 1 1 1
R2#show ip eigrp neighbor
IP-EIGRP neighbors for formula 100
R2# (Nothing to see here!)
The contiguousness is frayed down! If we varied the metric linear unit weights on R1 or separate that last pattern from R2, the contiguity would come with final up. You should have a extraordinarily suitable use to cash the EIGRP metric weights in the eldest place, but if you do tuning them on one EIGRP speaker in an AS, you more do so on all the other speakers in the AS as capably. And if you do so, substantiate them near prove ip eigrp neighbor!
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