OSPF vs ISIS - Which do you prefer & why?

sthaug at nethelp.no sthaug at nethelp.no
Thu Nov 10 12:46:30 UTC 2016

> I think you misunderstood his point: it's not the knobs, but the 
> vendors.  Generally, when you're trying to integrate random crap into an 
> otherwise well-structured network, you'll find OSPF available, but very 
> rarely IS-IS.

We never really want to talk IS-IS with random crap - in that case
the protocol of choice would be BGP.

> I run into this a lot in the security appliance space, where you want 
> your security appliances to either learn or advertise routes internally 
> (VPN tunnel reachability is a big reason for this), but also in devices 
> such as load balancers and other middlebox cruft that occasionally needs 
> to participate in routing advertisement/subscription.
> The ones who actually care about making it work almost always include 
> RIP and OSPF, with a few shout-outs to BGP.  IS-IS (and OSPF v3) rarely 
> makes the cut.

We've found that BGP works reasonably well to talk with such boxes,
and also that BGP is generally available.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no

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