[c-nsp] How the "best" route is selected (OSPF)

[Yuri Selivanov]

	Hi Kristofer!

[snip]

> The scenerio: Same network, learned through two seperate OSPF processes,
> same type (I tried external 1 and external 2).  This route is in the
> OSPF databases
> for both processes.
> The only difference is the metric.  It's much higher in one of the
> processes, as it's
> preferred.
 
> Now, the way I understand it, the route with the lower metric should
> always be chosen and put into the routing table.  However, it seems

	As far as I understand there is no way to compare two *equal-AD*
routes received from different procs:

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080531fd2.shtml#routepref
	
> that the route that's injected first wins.  Even if the other one pops
> in only a few minutes later, as long as the first one is valid, it
> continues to be the one in the routing table.
	
	... and result of this race depends on realization.

[snip]

> Thanks,
> -Kristo
> 
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-- 
Best Regards,
Yuri Selivanov [URI2-RIPE]