On Tue, 12 Jun 2001, Martin, Christian wrote:
> This bit me a while back. I was trying to build a nice, "scalable",
> multi-area network. The reasoning was that it was world-wide, with some
> slot routers and WAN links. Enterprise networks are always painful in the
> end when trying to engineer isp-like ideas into them...
Frequently this is because the network changes in some fundamental way
(hub-and-spoke becomes partial-mesh, etc.) and the IGP is not
re-evaluated. Or there is some pre-existing bias towards a particular IGP
(e.g. operational expertise) that precludes using the best IGP or best
combination of EGP/IGP when designing the new network. ISP networks can
be blissfully simple when compared to some enterprise requirements too.
Not too many ISPs are carrying IPX.
The bottom line is one IGP does not fit all networks equally well as this
example illustrates. Pick the IGP that fits the network.
-Scott
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