NSSA and Default Routing

INE Solution:

 

R5:
router ospf 1
area 3 nssa default-information-originate
area 3 default-cost 500

 

Alternate config:

R5:
router ospf 1
area 3 nssa default-information-originate metric 500

Comments

  • I don't understand how R8 can reply to pings with no route to R6 loopback (before advertising the default)?

    I can ping R8 loopback from R6, but not R6 from R8. I would think that communication would be broke both ways?

  • I also used the alternate one line config using "metric 500" and it seems to produce the same results as "default-cost 500" Is there a situation where one would be used over the other or would either be acceptable?

  • I think what you will find is that the default-cost 500 will apply that default-cost to any routes redistributed into the NSSA, whereas applying the metric will just apply it to the default.  I havent labbed this though so cant confirm.  

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