[nsp] OSPF NSSA

[Oliver Boehmer (oboehmer)]

> > Depending on the IOS version you are at you can use the command:
> > passive-interface default under OSPF so now you will only be
> > enabling OSPF on the interfaces that you specifically do a no
> > passive-interface [interface#] on.  Works very well to control
> > specifically what gets turned up.  Redistributing the connected
> > interfaces also now makes them external routes which is not ideal.
> 
> Do you have any known problems with external ospf routes?

Not necessarily. It really depends on your area setup, your router's
memory/etc, and, before all, your goals. From an SPF perspective there
is not much difference calculating a path based on a Type-3 or Type-5
LSA, they are both end-nodes in the tree, so don't influence the SPF
calculation. 
If you do use externals, you do want to use metric-type 1, as Paul
already mentioned..

	oli