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[safnog] OSPF vs ISIS - Which do you prefer & why?


My opinion is subjective...

They are both open standard protocols and I would say one is better than the other.

I  personally prefer IS-IS and its so simple for me to just deploy all boxes in the core as level-2 only boxes and i can scale to over 200 routers without a problem in a single topology/area....

Second thing for me personally is on IOS using "multi-topology", independent of IPv4/IS-IS allows for incremental deployment of IPv6/IS-IS...

Noah Maina

"A name indicates what we seek. An address indicates where it is. A route indicates how we get there."  Jon Postel

From: Michael Bullut <main at kipsang.com>
Sent: Thursday, September 1, 2016 3:25 PM
To: Southern African Network Operators Group
Subject: [safnog] OSPF vs ISIS - Which do you prefer & why?

Greetings Team,

?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. I came across this article<https://routingfreak.wordpress.com/2011/03/05/why-providers-still-prefer-is-is-over-ospf-when-designing-large-flat-topologies/> 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 (consider a huge flat network). What say you ladies and gentlemen?

Warm regards,

Michael Bullut.


Cell: +254 723 393 114.
Skype Name: Michael Bullut.
Twitter: @Kipsang<http://twitter.com/Kipsang/>
Blog: http://www.kipsang.com/
E-mail: main at kipsang.com<mailto:main at kipsang.com>

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