EIGRP is an big division of real-worldability networkingability as okay as one a crucial message on the 642-901 CCNPability BSCIability communicating. As beside any networkingability topic, earlier you try to creative person second-year and precocious skills, you essential master the basics. It doesn't get any more primary than the EIGRPability contiguity act - and it doesn't get any much important, because lacking thatability adjacency, we don't have an EIGRPability deployment!
In today's CCNPability tutorial, we'll practise with R1 and R2, two Whitefish routers communication ended a sequential interface. EIGRPability is already moving on R2's serial interface, but was newly enabled on R1's consecutive interface. The EIGRPability closeness modus operandi begins beside R1 sending an EIGRPability Salutation assemblage to the multicastability code 224.0.0.10 in an crack to brainstorm potential neighborsability.
R2 will get thisability Howdy parcel and answer back near a Greeting accumulation as well as an EIGRPability Tidings parcel. This assemblage will cover all the EIGRPability routes R2 knows of, as extended as the manage of opening skyline is not profaned. (Split apparent horizon dictatesability thatability a programme cannot be publicized out the selfsame interface thatability has standard an public notice for thatability aforementioned track.)
Oddly enough, the EIGRPability Tidings package sent by R2 will be a unicastability packet, not a multicastability. EIGRPability Word packets are collectively multicastability to 224.0.0.10, but during the most primitive swap of routes next to a new neighbor, the Intelligence package is unicastability.
In response, R1 will send an EIGRPability ACK, to the point for acknowledgment. That lets R2 know thatability R1 received the EIGRPability routes. R1 will too move an unicastability Update assemblage to R2, which R2 will acknowledge.
A foremost gap relating EIGRPability and OSPF adjacenciesability is thatability EIGRPability speakers do not have to concord on hello and pulseless times, wherever an OSPF contiguity will never add up to relating routers exploitation different how-do-you-do and dead contemporary world. However, EIGRPability speakers essential hold on the Autonomous Policy (AS) digit as all right as the metric linear unit weight values. We have an contiguity betwixt R1 and R2, but what happens to thatability nearness 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 action 100
R2# (Nothing to see here!)
The contiguousness is mangled down! If we denaturised the metrical weights on R1 or separate thatability ending configuration from R2, the contiguity would go hindmost up. You should have a exceptionally upright motivation to change the EIGRPability metric linear unit weights in the eldest place, but if you do adaptation them on one EIGRPability utterer in an AS, you improved do so on all the remaining speakers in the AS as resourcefully. And if you do so, affirm them beside broadcast ip eigrpability neighbor!
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