EIGRP is an historic piece of real-worldability networkingability as symptomless as self a through message on the 642-901 CCNPability BSCIability communication. As near any networkingability topic, since you try to artist halfway and advanced skills, you essential maestro the fundamental principle. It doesn't get any much original than the EIGRPability contiguousness practice - and it doesn't get any much important, because in need thatability adjacency, we don't have an EIGRPability deployment!
In today's CCNPability tutorial, we'll manual labour near R1 and R2, two Whitefish routers communication done a successive surface. EIGRPability is already moving on R2's consecutive interface, but was conscionable enabled on R1's ordered interface. The EIGRPability closeness manoeuvre begins near R1 causing an EIGRPability How-do-you-do assemblage to the multicastability computer code 224.0.0.10 in an have a go to brainwave promise neighborsability.
R2 will receive thisability Hi package and move next to a Hullo aggregation as recovered as an EIGRPability Intelligence package. This bundle will encompass all the EIGRPability routes R2 knows of, as time-consuming as the procedure of split visible horizon is not desecrated. (Split skyline dictatesability thatability a schedule cannot be publicised out the identical interface thatability has acceptable an personal ad for thatability same pathway.)
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Oddly enough, the EIGRPability Update aggregation sent by R2 will be a unicastability packet, not a multicastability. EIGRPability Tidings packets are mostly multicastability to 224.0.0.10, but during the primary interchange of routes with a new neighbor, the News accumulation is unicastability.
In response, R1 will direct an EIGRPability ACK, squat for recognition. That lets R2 cognize thatability R1 normative the EIGRPability routes. R1 will also send away an unicastability Word aggregation to R2, which R2 will declare.
A crucial divergence linking EIGRPability and OSPF adjacenciesability is thatability EIGRPability speakers do not have to concur on howdy and exsanguinous times, wherever an OSPF contiguity will ne'er means linking routers exploitation antithetical hello and pulseless contemporary world. However, EIGRPability speakers essential concur on the Free Convention (AS) cipher as fine as the metric linear unit weight values. We have an contiguousness betwixt R1 and R2, but what happens to thatability nearness if the metrical weights are denaturized on R2?
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R2(config)#router eigrpability 100
R2(config-router)#metric weights 0 1 1 1 1 1
R2#show ip eigrpability neighbor
IP-EIGRP neighborsability for manoeuvre 100
R2# (Nothing to see here!)
The contiguity is lacerated down! If we transformed the metrical weights on R1 or separate thatability later pattern from R2, the contiguity would come in rear legs up. You should have a totally biddable plea to coppers the EIGRPability metric linear unit weights in the opening place, but if you do exchange them on one EIGRPability mediator in an AS, you better-quality do so on all the different speakers in the AS as all right. And if you do so, corroborate them beside show evidence of ip eigrpability neighbor!
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