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

Hi Michael,

>From my experience working with service providers many engineers seem more comfortable with OSPF, whether this is due to experience or just as a result of training.

I love both protocols but as Johnny said - it is probably best to use the one your engineering team understands best.

Best regards


CCIE #39591

From: JC Cockburn <ccie15385 at gmail.com>
Sent: 01 September 2016 02:57 PM
To: 'Michael Bullut'; 'Southern African Network Operators Group'
Subject: Re: [safnog] OSPF vs ISIS - Which do you prefer & why?

Hi Michael,

I have come across both in SP networks...

My opinion is it makes sense to use the one which your team knows best.

I don't think resource intensive is that much of a worry these days...but I would always try to have either static routing or use BGP between CE and PE.

Good luck



From: Michael Bullut [mailto:main at kipsang.com]
Sent: 01 September 2016 02:25 PM
To: Southern African Network Operators Group <safnog at safnog.org>
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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