> Preparing for my BSCN exam, I have found myself unclear as to whether or
>not EIGRP is in fact a Hybrid or Distance-Vector protocol. All the Cisco
>classes I've been too have always referred to EIGRP as a Balanced Hybrid
>protocol, now studying for my CCNP, I am finding EIGRP referred to as a
>Distance-vector protocol???...How is this possible? Thanks...
From a technical standpoint, EIGRP is emphatically distance vector.
From a marketing standpoint, Cisco has called it "hybrid," which has
no accepted technical meaning. Training and certification have picked
up that terminology.
"Hybrid" is an attempt to differentiate EIGRP, and its DUAL
algorithm, from the problems of first and second generation DV
protocols. JJ Garcia-Luna-Aceves, the inventor of DUAL, always has
called it an advanced DV protocol, and he continues to work on even
more advanced DV.
There's nothing inherently wrong with DV. EIGRP legitimately has
fixed some of the problems of earlier DV protocols, such as the lack
of a hello subprotocol and reliable update mechanism. Without these
mechanisms, periodic update becomes necessary, and the protocol can't
be loop-free.
Calling something "hybrid" is about as sensible as saying "route bad,
switch good," or "all animals are equal, but some are more equal than
others."
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