From: John Underhill (stepnwlf@magma.ca)
Date: Mon Dec 08 2003 - 12:14:33 GMT-3
On the border router simply apply distance of 255 and route will be removed
from NSSA routers..
router ospf 100
area 1 nssa no-summary
passive-interface default
no passive-interface Serial0
network 150.50.1.0 0.0.0.255 area 1
network 201.1.1.0 0.0.0.255 area 0
distance 255 0.0.0.1 255.255.255.0 1
!
access-list 1 permit 0.0.0.0
----- Original Message -----
From: zzk
To: swm@emanon.com ; ccielab@groupstudy.com
Sent: Monday, December 08, 2003 9:33 AM
Subject: RE: how to filter out default route in OSPF totally stub area?
Hi Scott
Thanks for your reply.
I think there is nssa totally stub areas. You can see
it at
http://www.cisco.com/en/US/tech/tk365/tk480/technologies_tech_note09186a008
0094a88.shtml#definestub
The exit point of the whole network is inside this
area 1, so this ASBR has to generate default route for
the whole network. However we are trying to reduce the
number of LSAs in this area 1, thats why we also want
to use totally stub area.
I hope you understand the senario, and appreciate if
there is any better idea.
regards
--- Scott Morris <swm@emanon.com> wrote:
> If your area is "totally stub" then it is NOT
> "nssa". If it is "nssa",
> then it is NOT "totally stub". You have to choose
> one or the other. If
> you are configuring it as an nssa, then you have to
> add a specific
> command to generate a default route, it's not in
> there automatically.
>
> If you are a totally stubby area, it's generated
> automatically. If you
> don't want it to do that because there is more than
> one exit point, then
> you configured the area wrong.
>
> Otherwise, if information is coming from another
> protocol, you can
> always play with distance in order to prefer one
> over the other. But
> I'd suggest looking to fix your area setup first.
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service
> Provider) #4713,
> CISSP, JNCIS, et al.
> IPExpert CCIE Program Manager
> IPExpert Sr. Technical Instructor
> swm@emanon.com/smorris@ipexpert.net
> http://www.ipexpert.net
>
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of
> zzk
> Sent: Monday, December 08, 2003 5:44 AM
> To: ccielab@groupstudy.com
> Subject: how to filter out default route in OSPF
> totally stub area?
>
>
> Hi
> We have a totally stubby NSSA configured. Is there a
> way we can block the default route generated by the
> ABR?
>
> The reason is we need the routers to learn the
> default
> from another ASBR instead of this ABR.
>
> By default, ABR is automatically injecting a default
> route of type IA, but ASBR is advertising a default
> route of external type. Thus all routers chose the
> ABR
> instead of this ASBR.
> Thanks
>
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