EIGRP is an principal section of real-world networking as economically as self a main theme on the 642-901 CCNP BSCI examination. As next to any networking topic, earlier you try to maestro sophomore and advanced skills, you must master the nuts and bolts. It doesn't get any more essential than the EIGRP closeness action - and it doesn't get any much important, because in need that adjacency, we don't have an EIGRP deployment!
In today's CCNP tutorial, we'll pursue with R1 and R2, two Cisco routers communicating ended a serial surface. EIGRP is before now moving on R2's ordered interface, but was purely enabled on R1's sequent interface. The EIGRP adjacency course of action begins next to R1 causing an EIGRP Hello parcel to the multicast computer address 224.0.0.10 in an endeavour to discovery likely neighbors.
R2 will have this Hello package and react near a Hello aggregation as all right as an EIGRP Update packet. This assemblage will contain all the EIGRP routes R2 knows of, as hourlong as the concept of crack line is not profaned. (Split apparent horizon dictates that a way cannot be advertised out the very interface that has standard an commercial for that same route.)
Number of records:
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Oddly enough, the EIGRP Update package transmitted by R2 will be a unicast packet, not a multicast. EIGRP Update packets are unanimously multicast to 224.0.0.10, but during the premier exchange of routes beside a new neighbor, the Update bundle is unicast.
In response, R1 will displace an EIGRP ACK, abbreviated for acceptance. That lets R2 know that R1 prescriptive the EIGRP routes. R1 will likewise dispatch an unicast Update collection to R2, which R2 will acknowledge.
A leading variation concerning EIGRP and OSPF adjacencies is that EIGRP speakers do not have to concur on hi and dead times, wherever an OSPF closeness will never word linking routers mistreatment different how-do-you-do and doomed times. However, EIGRP speakers essential concord on the Autonomous System (AS) numeral as resourcefully as the metrical weight values. We have an closeness linking R1 and R2, but what happens to that nearness if the metric linear unit weights are denaturised on R2?
Certain patterns
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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 modus operandi 100
R2# (Nothing to see here!)
The adjacency is frayed down! If we transformed the metric linear unit weights on R1 or removed that closing arrangement from R2, the contiguity would come up final up. You should have a unbelievably well behaved basis to shift the EIGRP metric linear unit weights in the introductory place, but if you do cash them on one EIGRP utterer in an AS, you improved do so on all the other speakers in the AS as capably. And if you do so, corroborate them next to viewing ip eigrp neighbor!
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