The internet is the largest mesh network in operation today. However,
there is no comparison to internet routing and redundancy to that of
private network routing and redundancy. The internet is so huge that
smart routing decisions can only be made at the edge. With a private
network, the size is generally manageable enough to make smarter routing
decisions throughout. Take BGP for instance, which is used to
dynamically manage routes on the internet. It can take anywhere from 4
to 10 minutes to fully resolve a route flap when a link goes down.
Compare that with your average IGP, which takes only seconds to fully
resolve a route flap.
-Matt
A. Huppenthal wrote:
I haven't read your summary yet, but would like to chime in a bit on
Mesh...
When the DoD developed TCP/IP, they built it to be robust under
war-time conditions. This means fault tolerant, rerouting,
change-over, change-back.
It would wonderful to hear the Mesh scientists (not sales people)
describe what it is about mesh that gives it an edge over TCP/IP
protocols, including their routing protocols.
I'll read your notes with some interest, in the hopes they'll shed
some light on this fundemental question. Else, historically mesh has
been a crapola of marketing hype, generalizations, and "I have it
nailed" crap intended to fuel someone's new car or new house, new
sales organization - and not provide any real customer/network
operator benefit. In my humble opinion.
I personally have spoken to Microsoft's development leader on Mesh and
had it explained that dozens of PhD's were working on Mesh solutions
at MS. Ah, okay, I'm guess Motorola and 10 other companies are doing
this as well.
Has anyone deployed a TCP/IP network that's fault tolerant - along the
lines of the DoD's intent for the network? Using 'Mesh' or otherwise.
I'm all ear.
Matt Liotta wrote:
Attached is a quick rundown of basic mesh theory that I put together
in light of the recent thread. It hasn't been peer reviewed or
edited, which I would normally do before sharing publicly. But since
I only wrote because of a thread on this list I figured I would just
share it. Feel free to pick it apart.
I do want to point out a couple of things though. First, this was
written in a generic way only covering mesh as a theory. As written
it can be applied to various transport technologies from fiber to
wireless; though I do provide an example using wireless P2P links.
Applying mesh theory to wireless P2MP or ad-hoc networks would
require special coverage.
-Matt
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