From: Marc (tan@dia.janis.or.jp)
Date: Mon May 12 2003 - 12:46:23 GMT-3
Thanks Kasturi, I think I undertand the general concept with and without the
always keyword. A simple scenario I was working earlier though seemed
backwards.
nssa client
default route shows up in route-table
nssa external type 7, 0.0.0.0
nssa abr/asbr
area x nssa default-i-o (no always keyword)
Even when the asbr/abr DID NOT have the default route and d-i-o without the
always keyword, the nssa far router had a default route show up in route
table. I thought someone might know off the top of their head an
explanation. Maybe I'll lab it up again and send configs. Probably made a
mistake. Thanks, Marc.
-----Original Message-----
From: kasturi cisco [mailto:kasturi_cisco@hotmail.com]
Sent: Monday, May 12, 2003 11:42 PM
To: tan@dia.janis.or.jp
Subject: Re: originate vs originate always
Marc,
Let us asssume the toplogy: R1------R2--------R3-------cloud
All of them in area 0 for ease.
R3 is generating the default to cloud using : ip route 0.0.0.0 0.0.0.0
x.x.x.x. Now to generate the default route into OSPF u have to use
"default-inf-org" cmd on R3 such that R2 and R1 get it.
When u use just "default-inf-org" on R3 it will generate the default if it
has one itself (like above).
When u use just "default-inf-org always" on R3 it will generate the
default even if does not have it. This can lead to blackholing in case R2/R1
send traffic to R3 which does not have the default itself.
Hope that helps.
Good Luck,
Kasturi.
>From: "Marc"
>Reply-To: "Marc"
>To: "Ccielab (E-mail)"
>Subject: originate vs originate always
>Date: Sun, 11 May 2003 16:32:38 +0900
>
>On an asbr/abr and with virtual link, I am trying to figure out why I
don't
>get expected behaivor of default-i-o towards an nssa area.
>
>I had thought that
>-with no previous learned default, must use "always" keyword
>-with previous learned default, do not need "always" keyword.
>
>But I find without a previous learned default, the default gets sent
anyway
>without the "always" keyword. Can someone explain if there is some other
>parameter involved with d-i-o besides just having the default already
>learned through other means?
>
>Thanks
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