[c-nsp] Rationale for ISIS default origination behavior

[Saku Ytti]

On (2013-01-22 21:38 +1100), Andrew Miehs wrote:

> If you have a full routing table, you don't need a default route.
> If you don't have full routing tables, or want/ need a default route -
> point it to your two major "up-streams".

If one of the up-streams gets disconnected from core, only connecting to
your PE. Your PE will keep using static route and blackhole traffic.

Furthermore in OPs question, if you try to set static default to both
direction in each box, you'll have loop always.

-- 
  ++ytti