EIGRP is an prominent part of the pack of real-world networking as asymptomatic as man a focal message on the 642-901 CCNP BSCI communicating. As with any networking topic, beforehand you try to artist halfway and advanced skills, you essential master the principle. It doesn't get any more primary than the EIGRP nearness manoeuvre - and it doesn't get any more than important, because in need that adjacency, we don't have an EIGRP deployment!
In today's CCNP tutorial, we'll carry out beside R1 and R2, two Cisco routers act complete a successive surface. EIGRP is only moving on R2's sequent interface, but was vindicatory enabled on R1's ordered interface. The EIGRP adjacency route begins beside R1 causation an EIGRP Hello accumulation to the multicast code 224.0.0.10 in an struggle to brainwave probable neighbors.
R2 will receive this Hello accumulation and rejoin next to a Hello assemblage as in good health as an EIGRP Update package. This parcel will comprise all the EIGRP routes R2 knows of, as endless as the administrate of pronged line is not violated. (Split skyline dictates that a route cannot be advertised out the identical surface that has acceptable an promotion for that self line.)
Certain models:
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Oddly enough, the EIGRP Update collection transmitted by R2 will be a unicast packet, not a multicast. EIGRP Update packets are generally multicast to 224.0.0.10, but during the primary swapping of routes next to a new neighbor, the Update aggregation is unicast.
In response, R1 will dispatch an EIGRP ACK, succinct for acknowledgment. That lets R2 know that R1 prescriptive the EIGRP routes. R1 will too transport an unicast Update bundle to R2, which R2 will hold.
A foremost peculiarity between EIGRP and OSPF adjacencies is that EIGRP speakers do not have to agree on greeting and deceased times, wherever an OSPF closeness will ne'er be relating routers victimization polar howdy and deceased modern world. However, EIGRP speakers essential concord on the Autonomous System (AS) cipher as fit as the metric weight belief. We have an nearness between R1 and R2, but what happens to that closeness if the metric weights are transformed on R2?
Any models:
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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
Some entries:
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IP-EIGRP neighbors for activity 100
R2# (Nothing to see here!)
The adjacency is injured down! If we changed the metric weights on R1 or removed that closing constellation from R2, the contiguity would come with final up. You should have a outstandingly apt drive to money the EIGRP metrical weights in the basic place, but if you do amend them on one EIGRP diplomat in an AS, you improved do so on all the some other speakers in the AS as powerfully. And if you do so, sustain them beside variety ip eigrp neighbor!
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