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<div class="moz-cite-prefix">On 1/Sep/16 14:25, Michael Bullut
wrote:<br>
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<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small">Greetings
Team,</div>
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<div class="gmail_default"><font face="arial, helvetica,
sans-serif">While I haven't worked with IS-IS before but
the only disadvantage I've encountered with OSPF is that
it is resource intensive on the router it is running on
which is why only one instance runs on any PE & P
device on an ISP network. OSPF is pretty good in handling
the core network routing while BGP & EGP handle the
last-mile routing between PE & CE devices. BGP &
EGP can run on top of OSPF. </font><font face="arial,
helvetica, sans-serif">I came across this <a
moz-do-not-send="true"
href="https://routingfreak.wordpress.com/2011/03/05/why-providers-still-prefer-is-is-over-ospf-when-designing-large-flat-topologies/"><b>article</b></a>
when scrolling the web a while back and I still want to
find out if am the only one who thinks its a matter of
choice between the two. Although there isn't distinct 1:1
argument, it's good we discuss it here and figure out why
one prefer one over the other </font><font face="arial,
helvetica, sans-serif"><i>(consider a huge flat network)</i></font><span
style="font-family:arial,helvetica,sans-serif"><i>.</i> </span>What
say you ladies and gentlemen? <br>
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In 2016, it's a matter of choice.<br>
<br>
We run IS-IS, in our network, and the reason I've always given for
that as being primary to us is that there is no need to connect
everything back to Area 0, like OSPF.<br>
<br>
That said, from a technology perspective, I'd say OSPFv3 is closer
to IS-IS. But given the amount of processing and memory capacity
in modern routers (and the advancement of code implementing these
protocols), one can get away with a single "Area 0" OSPF network,
just about fine.<br>
<br>
Mark.<br>
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