>
>Does an EIGRP AS have to be contiguous or can it be on
>two sides of an IGRP 'AS'. I note that the use of the
>term AS is a mis-nomer for both protocols, but...
>
>For example, does:
>
>EIGRP AS 1 ---- IGRP AS 1 ---- EIGRP AS 1
>
>pose a problem?
I'm trying to think of an extension of the Prime Directive (what is the
problem you are trying to solve?)--"what is the problem you are trying to
create?"
An assortment of issues would have to be considered. In the example above,
if all classful networks are contiguous (i.e., a given classful network is
either in the left or right EIGRP process, or in IGRP only), and the left
and right EIGRP processes are on different physical routers. I suspect it
would work. Discontiguous networks definitely would break things.
Spreading a network between either EIGRP _and_ IGRP probably would also be
a problem, unquestionably if EIGRP used VLSM.
The configuration below would even more probably work, as long as there
were no discontiguous subnets.
>
>Does:
>
>EIGRP AS 1 ---- IGRP AS 50 ---- EIGRP AS 1
>
>My belief is that it could work, but it breaks the
>concept of an AS and could lead to routing topology
>table problems. Any takers?
Now--would I do either one? No. It's too confusing.
I haven't had quite this scenario, but I have had situations where I had
two OSPF area 0.0.0.0 sections that HAD TO be connected across non-OSPF,
for a period of migration.
Accepting a performance hit by doing so, I made the separate parts a
contiguous area by running a GRE tunnel between them, and isolated the OSPF
addresses from the transit network (i.e., no redistribution).
If Winston Churchill had designed this, and was challenged about it while
intoxicated, his reply would have been: "Madam, I am indeed drunk, very
drunk, and disgustingly drunk. And, Madam, this design is ugly, very ugly,
and disgustingly ugly.
"And, in the morning, I shall be sober."
>Nothing but net!
>
>=====
>Robert Padjen
>
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