From: kasturi cisco (kasturi_cisco@hotmail.com)
Date: Mon May 12 2003 - 17:19:12 GMT-3
Tim,
From what i understand, the "area x nssa defa-info orig" generates
default route based on following condition:
If NSSA ASBR: will generate the default only if it has one itself.
If NSSA ABR : will generate default route irrespective of it having it.
Good Luck,[IMAGE]
Kasturi.
>From: Tim Fletcher >To: Marc , "Ccielab (E-mail)" , 'kasturi cisco'
>Subject: RE: originate vs originate always >Date: Mon, 12 May 2003
16:05:22 -0400 > >rtr(config-router)#area 1 nssa
default-information-originate ? > no-summary Do not send summary LSA into
NSSA > > >rtr(config-router)#area 1 nssa default-information-originate >
>The "always" keyword only applies the the "default-information
>originate" command, not the "area x nssa >default-information-originate"
command. The "area x nssa >default-information-originate" will always
generate a default route >into the nssa area, whether you have a default
or not. > >HTH > >-Tim Fletcher #11406 > >At 12:46 AM 5/13/2003 +0900,
Marc wrote: >>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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