From: Denise Donohue (fradendon@xxxxxxxx)
Date: Sun Jan 13 2002 - 22:16:15 GMT-3
>From the link that Peter sent:
NSSA ASBR can generate a default only when it has a default route in its
routing table.
NSSA ABR can generate a default route with or without a default route in its
own routing table.
I ran into this issue today. I had a router with an EIGRP interface, an
OSPF area 0 interface, and a couple of interfaces in a NSSA (regular NSSA,
not 'no-summary'). That router wouldn't send a default route into the NSSA
area until I put in a 'default network' command. BTW, is a default network
considered a static route???
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Troy Rader
Sent: Sunday, January 13, 2002 7:26 PM
To: Albert Lu
Cc: ccielab@groupstudy.com
Subject: RE: OSPF NSSA default route question
No, you do not need a static default route for OSPF to inject the default
route to the other routers when using 'no-summary' with NSSA, which I've
seen being described as an "NSSA Totally stub area".
I would not answer so confidently if I didn't have this setup in my lab
right now, and double checked it twice before replying. :)
If anyone believes otherwise, please correct me. Thanks.
Troy
On Mon, 14 Jan 2002, Albert Lu wrote:
> Do you need a static default route for OSPF to inject the default route to
> the other routers?
>
> -----Original Message-----
> From: Troy Rader [mailto:troy@onenet.net]
> Sent: Monday, January 14, 2002 11:07 AM
> To: Albert Lu
> Cc: ccielab@groupstudy.com; 'Peter van Oene'
> Subject: RE: OSPF NSSA default route question
>
>
> Yes it does. Using 'no-summary' removes inter-area routes. Using
> 'def-info-orig' does not remove inter-area routes. Both methods do inject
> a default route.
>
> Thanks for the great replies. This is an area I struggled with, and now
> looking back, don't see why it was so difficult. :)
>
> Troy
>
>
>
> On Mon, 14 Jan 2002, Albert Lu wrote:
>
> > Wouldn't using
> >
> > area 1 nssa no-summary
> >
> > also inject a default route?
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Peter van Oene
> > Sent: Monday, January 14, 2002 9:40 AM
> > To: Troy Rader; ccielab@groupstudy.com
> > Subject: Re: OSPF NSSA default route question
> >
> >
> > In additional, hitting cisco.com and entering nssa default information
> > brings up this as the first hit.
> >
> > http://www.cisco.com/warp/public/104/nssa.html#3
> >
> > This is a pretty decent page describing some NSSA config
> > elements. Although the Cisco search engine is not the best thing in the
> > world, it definitely doesn't hurt to try it.
> >
> > pete
> >
> > ps, since I unicast my first post, the answer is adding area 1 nssa
> > default-information-originate on R2, the NSSA ABR.
> >
> >
> > At 03:27 PM 1/13/2002 -0600, Troy Rader wrote:
> > >I've searched the archives and I'm not finding an answer that clears
this
> > >issue up for me.
> > >
> > >Here's my diagram: (I guess proportional font matters here)
> > >
> > >R10---R8---R3---R6---R2---R9---R11---R14---R4
> > > |
> > > |
> > > R5
> > >
> > >R10-R8 is RIP
> > >R8-R3-R6 is Area 2
> > >R6-R2 is Area 0
> > >R6-R5 is Area 3
> > >R2-R9-R11 is Area 1
> > >R11-R14 is IGRP
> > >R14-R4 is RIP
> > >
> > >Area 3 was the stub and then totally stubby area. I did okay with
that.
> > >
> > >Area 1 is where I have my NSSA. I understand that my external routes
> from
> > >R10 are not learned in the NSSA, and that the redist'd routes from R11
> and
> > >IGRP are N1 or N2 OSPF NSSA Ext and are propogated throughout OSPF.
> > >However, I'm lost on how to allow R9 and R11 to get to R10 RIP networks
> > >since they are External and not visible in the NSSA. I tried to
> originate
> > >a default from R2. R6 ended up with a default, but R9 did not.
> > >
> > >What's the trick, solution, answer?
> > >
> > >TIA,
> > >Troy
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