OSPF type 4 in stub areas

nicklauscombs

right now my I feel my weak areas are dhcp config, multicast config and bgp attributes which will be more of my focus along with going over the fine tunings of ospf and isis, all in all I think i'm well on my way to my august 20th test date and worse case scenario I bump it back a little more.

gojericho0

Another great thing to do is use cisco's netpro forums. Lots of good real world problems you can learn from and help other people using these technologies

http://forums.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Network%20Infrastructure&topic=WAN%2C%20Routing%20and%20Switching&CommCmd=MB%3Fcmd%3Ddisplay_messages%26location%3D.ee71a06

mikearama

I have a follow up OSPF question that I'm unclear on...

I see in the CLI that it's possible to put "no summary" after OSPF 1 NSSA.

So you can make a NSSA into to totally stubby not-so-stubby area?

So which LSA's get through? Am I right that you'd have nothing but a default route, PLUS type 7's getting converted to type 5's, passed on by the ABR?

Mike

Plazma

Yes , it makes it a Not so Totally stubby area.

This one has the exact same rules as the Totally stubby + the rules for the NSSA.

So it blocks type 3, 4, 5 LSA's and uses the type 7 for external routes.

gojericho0

Ok another BONUS QUESTION.

What is the caveat if you have 2 ASBR\ABRs for redundancy?

kpjungle

gojericho0 wrote:

Ok another BONUS QUESTION.

What is the caveat if you have 2 ASBR\ABRs for redundancy?

What metric you should choose to make the best routing decicisions. When you only have the default route, your internal routers dont have much to go on. You can tweak the costs of the paths to make a better routing decision, or if external routes, use type E1 to include cost of the path.