EIGRP is an distinguished portion of real-world networking as well as human being a star theme on the 642-901 CCNP BSCI communication. As with any networking topic, back you try to artist third-year and precocious skills, you must artist the essentials. It doesn\\'t get any more of import than the EIGRP adjacency method - and it doesn\\'t get any more important, because in need that adjacency, we don\\'t have an EIGRP deployment!
In today\\'s CCNP tutorial, we\\'ll hard work beside R1 and R2, two Cisco routers act over and done with a ordered interface. EIGRP is simply moving on R2\\'s consecutive interface, but was only enabled on R1\\'s ordered interface. The EIGRP contiguousness route begins beside R1 sending an EIGRP Hello accumulation to the multicast address 224.0.0.10 in an endeavour to brainstorm possible neighbors.
R2 will have this Hello package and act near a Hello accumulation as very well as an EIGRP Update bundle. This package will cover all the EIGRP routes R2 knows of, as longish as the guideline of breach apparent horizon is not violated. (Split visible horizon dictates that a programme cannot be publicized out the self interface that has standard an ad for that one and the same route.)
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Oddly enough, the EIGRP Update bundle transmitted by R2 will be a unicast packet, not a multicast. EIGRP Update packets are collectively multicast to 224.0.0.10, but during the prototypical substitution of routes next to a new neighbor, the Update accumulation is unicast.
In response, R1 will send away an EIGRP ACK, short for acknowledgement. That lets R2 know that R1 acceptable the EIGRP routes. R1 will besides direct an unicast Update assemblage to R2, which R2 will hold.
A through peculiarity betwixt EIGRP and OSPF adjacencies is that EIGRP speakers do not have to hold on how-do-you-do and deceased times, where an OSPF nearness will never type linking routers exploitation dissimilar hello and doomed modern world. However, EIGRP speakers must concord on the Autonomous System (AS) figure as well as the metrical weight belief. We have an closeness involving R1 and R2, but what happens to that nearness if the metrical weights are changed on R2?
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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 activity 100
R2# (Nothing to see here!)
The contiguousness is in shreds down! If we denatured the metrical weights on R1 or separate that past plan from R2, the closeness would locomote hindmost up. You should have a very well behaved use to revise the EIGRP metrical weights in the preliminary place, but if you do adaptation them on one EIGRP speaker in an AS, you enhanced do so on all the other speakers in the AS as asymptomatic. And if you do so, verify them next to substantiate ip eigrp neighbor!
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