From: Katson PN Yeung (kyeung@xxxxxxxxx)
Date: Thu May 02 2002 - 22:29:31 GMT-3
Dear group,
I have a question about Solie's book P.791.
On the 2nd paragraph from the top, it saids:
"You cannot summarize Area 0 or the backbone area. All summaries are
flooded into area 0 and then are flooded out from that point. Therefore
Area 0 routes cannot be summarized"
However, in the scenario such as below:
R4
|s0
|
--s0.1---| R1---|e0
|e0-R3< /
--s0.2---------<
\
R2---|e0
Where R3s0.2, R1s0, and R2s0 forming OSPF area 0 (/28 subnet)
- R1e0 area 1 (/24)
- R2e0 area 2 (/24)
- R3e0 being area 3 (/24 or whatever)
- R3 s0.1 and R4 running igrp (/24)
Isn't it easy (and convenient) to create a /24 summary route by "area 0
range x.x.x.x 255.255.255.0" at R3, and then get it redistributed to igrp?
I did they before since the redis connected/summary ASBR method doesn't
work now.
Solie P.791 makes me confused. Can someone clarifies if this "area 0
range" method is "okay to use" in the real lab environment?
Or just like someone saids, tunnel method, sec interface method? or even
piggy-back OSPF
method are the more preferable way to make a /24 summary route?
Thanks a lot.
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