IGP choice

Dave Bell me at geordish.org
Thu Oct 22 19:35:53 UTC 2015

On 22 October 2015 at 19:41, Mark Tinka <mark.tinka at seacom.mu> wrote:
> The "everything must connect to Area 0" requirement of OSPF was limiting
> for me back in 2008.

I'm unsure if this is a serious argument, but its such a poor point
today. Everything has to be connected to a level 2 in IS-IS. If you
want a flat area 0 network in OSPF, go nuts. As long as you are
sensible about what you put in your IGP, both IS-IS and OSPF scale
very well.

The differences between the two protocols are so small, that people
really grasp at straws when 'proving' that one is better over the
other. 'IS-IS doesn't work over IP, so its more secure'. 'IS-IS uses
TLVs so new features are quicker to implement'. While these may be
vaguely valid arguments, they don't hold much water. If you don't
secure your routers to bad actors forming OSPF adjacencies with you,
you're doing something wrong.Who is running code that is so bleeding
edge that feature X might be available for IS-IS, but not OSPF?

Chose whichever you and your operational team are most comfortable
with, and run with it.


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