>abc wrote,
>IGRP use distance vector routing protocol alogorithm to discover neighbor.
>
>EIGRP use link state routing protocol algorithm to discover neighbor
No, EIGRP does not use a link state mechanism for neighbor discovery.
It does, however, use a hello subprotocol, and the link state
protocols (ISIS and OSPF) use different hello subprotocols.
Neighbor discovery in RIP and IGRP are fairly tightly coupled to
distance vector, because one of the first notifications of a
neighbor's existence is that it sends a routing update. (Actually, in
RIP at least -- I'd have to research IGRP -- you first hear a routing
table query from a neighbor, which sends its table only after you
respond). In EIGRP, ISIS, and OSPF, neighbor discovery is completely
decoupled from the topology update mechanism.
>.
>
>Metric calaucation is basically same, but eigrp multiply 256.
>
>No wonder, cisco certification is no longer valueable.
I question your observations, because you have not really
demonstrated you understand how the protocols work. Now, please
understand I am not trying to be overly critical. Many courses and
books teach it incorrectly, with marketing confusion about "hybrid"
protocols, and especially the erroneous association of hello
subprotocols with link state. To achieve real understanding, one has
to dig beyond the confusion and often go back to source material.
>
>""John Feuerherd"" Hello all,
>> I'm studying for my CCIE written exam and I came across a question on a
>> sample test that has me a little baffled. It states that EIGRP and IGRP
>use
>> the same network discovery method. I know they use the same metrics, but
I
>> am under the impression that they use different methods when discovering
>> networks. Am I correct in that statement?
>>
>> Thanks in advance,
>> JF
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