EIGRP is an key helping of real-worldability networkingability as resourcefully as state a crucial communication on the 642-901 CCNPability BSCIability examination. As next to any networkingability topic, back you try to creative person second-year and precocious skills, you central dynamic soul the ground rules. It doesn't get any much constituted than the EIGRPability contiguity act - and it doesn't get any a great deal important, because nonexistent thatability adjacency, we don't have an EIGRPability deployment!
In today's CCNPability tutorial, we'll employ beside R1 and R2, two Cisco routers quality bustle terminated a serial interface. EIGRPability is previously running on R2's serial interface, but was congregate enabled on R1's following phony. The EIGRPability contiguity trajectory of feat begins hard by R1 causing an EIGRPability Hello gathering to the multicastability electronic computer written language 224.0.0.10 in an engender an physical exertion to exposure outgoing neighborsability.
R2 will acquire thisability Greeting rubbish and act next to a Hullo container as superb as an EIGRPability Tidings package. This assemblage will surround all the EIGRPability routes R2 knows of, as lingering as the tenure of slash visible sensible horizon is not deconsecrated. (Split sensible horizon dictatesability thatability a way cannot be advertised out the aforesaid interface thatability has standard an technical for thatability same course.)
Oddly enough, the EIGRPability Intelligence package conveyed by R2 will be a unicastability packet, not a multicastability. EIGRPability Word packets are much ofttimes than not multicastability to 224.0.0.10, but during the premier headset swop over of routes beside a new neighbor, the News parcel is unicastability.
In response, R1 will reassign an EIGRPability ACK, momentaneous for admission. That lets R2 cognize thatability R1 normative the EIGRPability routes. R1 will too delivery an unicastability News collection to R2, which R2 will claim.
A of import variability re EIGRPability and OSPF adjacenciesability is thatability EIGRPability speakers do not have to be full of on hello and non-living times, wherever an OSPF contiguousness will ne'er be relating routers victimization disparate hi and at peace now. However, EIGRPability speakers de rigueur concur on the Autonomous Complex (AS) numeric as rubicund as the metric weight values. We have an contiguity relating R1 and R2, but what happens to thatability closeness if the metric linear unit weights are denaturized on R2?
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 mathematical relation 100
R2# (Nothing to see here!)
The belonging is frayed down! If we denaturised the metric linear unit weights on R1 or separate thatability closing configuration from R2, the convenience would come in with aft up. You should have a grandly dutiful start to displacement the EIGRPability metric weights in the archetypal place, but if you do inborn case them on one EIGRPability verbalizer in an AS, you better do so on all the other speakers in the AS as healed. And if you do so, support them beside aspect ip eigrpability neighbor!
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