>Howard,
> In looking into this I was amazed by the lack of
information
>on these very specific parts of the protocol itself. However, I can't seem
>to find anything that would seem as a source other than the Cisco
>white-paper and Don Dettmore's EIGRP white-paper on the CZone. I'm also
>using Doyle's Routing TCP/IP and Adv. IP Network Design.
I agree there is a severe lack of detail. While I don't have the
URLs, unfortunately, there were some fairly detailed presentations a
couple of Networkers ago -- I'd imagine they have been kept updated.
There are still parts of the protocol, such as the details of the
reliable multicast, that as far as I know, Cisco keeps proprietary.
Frankly, the lack of availability of detailed information is one
reason I avoid EIGRP.
Garcia-Luna-Alceves' papers get into the algorithm but not the
implementation.
>
>Could you point out some links that would provide a better reference. This
>way we could all possibly get a better understanding ourselves.
>
>TIA
>
>Nigel..
>
>----- Original Message -----
>From: Howard C. Berkowitz
>To:
>Sent: Sunday, July 08, 2001 9:13 AM
>Subject: Re: EIGRP and IGRP network discovery [7:11273]
>
>
>> >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
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=11333&t=11273
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