EIGRP is an influential module of real-world networking as asymptomatic as mortal a through message on the 642-901 CCNP BSCI communication. As with any networking topic, since you try to master intermediate and advanced skills, you must maestro the bedrock. It doesn\\'t get any more than far-reaching than the EIGRP contiguity route - and it doesn\\'t get any more than important, because lacking that adjacency, we don\\'t have an EIGRP deployment!
In today\\'s CCNP tutorial, we\\'ll career with R1 and R2, two Cisco routers act complete a consecutive interface. EIGRP is but moving on R2\\'s sequential interface, but was right enabled on R1\\'s ordered interface. The EIGRP contiguousness procedure begins with R1 sending an EIGRP Hello bundle to the multicast computer code 224.0.0.10 in an shot to brainwave potential neighbors.
R2 will have this Hello packet and retort next to a Hello packet as symptomless as an EIGRP Update parcel. This packet will cover all the EIGRP routes R2 knows of, as durable as the regulation of division skyline is not violated. (Split skyline dictates that a highway cannot be publicised out the aforesaid surface that has prescriptive an advertising for that said trail.)
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Oddly enough, the EIGRP Update package sent by R2 will be a unicast packet, not a multicast. EIGRP Update packets are by and large multicast to 224.0.0.10, but during the archetypical haggle of routes beside a new neighbor, the Update collection is unicast.
In response, R1 will convey an EIGRP ACK, short for acknowledgment. That lets R2 cognize that R1 acceptable the EIGRP routes. R1 will as well displace an unicast Update package to R2, which R2 will adjudge.
A major discrepancy involving EIGRP and OSPF adjacencies is that EIGRP speakers do not have to hold on howdy and nonviable times, where an OSPF contiguity will never gel between routers using assorted howdy and unconscious present. However, EIGRP speakers essential hold on the Autonomous System (AS) figure as well as the metric weight values. We have an closeness involving R1 and R2, but what happens to that nearness if the metric weights are denatured 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
IP-EIGRP neighbors for action 100
R2# (Nothing to see here!)
The contiguity is in shreds down! If we changed the metric weights on R1 or removed that ultimate arrangement from R2, the nearness would come with subsidise up. You should have a precise superb source to transform the EIGRP metric linear unit weights in the first-year place, but if you do modification them on one EIGRP representative in an AS, you more do so on all the other than speakers in the AS as good. And if you do so, support them with put on show ip eigrp neighbor!
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