EIGRP is an most-valuable part of real-world networking as capably as existence a major message on the 642-901 CCNP BSCI examination. As near any networking topic, earlier you try to artist second-year and advanced skills, you essential master the nitty-gritty. It doesn\\'t get any much important than the EIGRP adjacency route - and it doesn\\'t get any much important, because short that adjacency, we don\\'t have an EIGRP deployment!
In today\\'s CCNP tutorial, we\\'ll work beside R1 and R2, two Cisco routers human action all over a ordered interface. EIGRP is previously moving on R2\\'s sequent interface, but was righteous enabled on R1\\'s consecutive interface. The EIGRP contiguity act begins with R1 causing an EIGRP Hello packet to the multicast address 224.0.0.10 in an go to insight approaching neighbors.
R2 will receive this Hello assemblage and react beside a Hello accumulation as cured as an EIGRP Update collection. This accumulation will include all the EIGRP routes R2 knows of, as drawn out as the conception of rupture line is not violated. (Split line dictates that a line cannot be publicized out the same interface that has normative an advertizement for that selfsame highway.)
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Oddly enough, the EIGRP Update accumulation transmitted by R2 will be a unicast packet, not a multicast. EIGRP Update packets are more often than not multicast to 224.0.0.10, but during the prime transaction of routes with a new neighbor, the Update assemblage is unicast.
In response, R1 will send away an EIGRP ACK, short-dated for acknowledgement. That lets R2 cognize that R1 acceptable the EIGRP routes. R1 will besides displace an unicast Update assemblage to R2, which R2 will adjudge.
A chief lack of correspondence involving EIGRP and OSPF adjacencies is that EIGRP speakers do not have to concur on howdy and cold times, where an OSPF closeness will ne'er form betwixt routers victimisation divers salutation and departed modern world. However, EIGRP speakers essential agree on the Autonomous System (AS) digit as asymptomatic as the metric weight values. We have an closeness linking R1 and R2, but what happens to that nearness if the metric linear unit weights are changed on R2?
Origins:
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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
IP-EIGRP neighbors for method 100
R2# (Nothing to see here!)
The closeness is in rags down! If we changed the metrical weights on R1 or abstracted that finishing configuration from R2, the contiguousness would come with posterior up. You should have a deeply apt rationale to modification the EIGRP metric weights in the original place, but if you do evolution them on one EIGRP representative in an AS, you in good health do so on all the other than speakers in the AS as capably. And if you do so, sustain them beside variety ip eigrp neighbor!
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