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

[Mark Prior]

I think that the key thing is to go with the protocol that your support
team know. I learned ISIS while doing my JNCIP and I didn't discover
anything compelling while playing configuration games in my lab to make
me want to make the change from OSPF (even when using OSPFv2 and v3) to
ISIS. If your NOC staff have experience with both then it might be tough
to choose one but if not go with the one they know and avoid angst :-)

Mark.

On 1/09/2016 22:34, Paul Wilkins wrote:
> All I can say is that redistribution between IGPs is never the right
> answer. OSPF works and is generally well understood.
> 
> Kind regards
> 
> Paul Wilkins
> 
> On 1 September 2016 at 22:25, Michael Bullut <main at kipsang.com
> <mailto:main at kipsang.com>> wrote:
> 
>     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.
> 
>     ---
> 
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