From: Scott Livingston (scottl@xxxxxxxxxxxxxxxxx)
Date: Tue Jul 23 2002 - 18:45:59 GMT-3
I wont answer for Anthony, but chime my own understanding.
The "no-redistribute" used on the ABR/ASBR will allow LSA type 5's in
all other area's but the NSSA. The type 5's are only converted to type
7 if heading into a NSSA as a result of NOT configuring
"no-redistribute".
The ABR/ASBR that has the "no-redistribute" command riding on it does
not convert the type 5 LSA's to type 7 - I do believe, as they are not
heading into a NSSA. Although it will convert type 7 --> type 5 when
heading out of the NSSA; with "no-redistribute" configured or not.
Also, if you configure the "default-information-originate" on an ASBR
you will need to configure a default route 0.0.0.0/0. This rule does
not apply to an ABR. But now I am going to head to the lab late tonight
because I don't know how the "default-information-originate" works if
you configure it on an ABR/ASBR :); do you still have to configure a
default route 0.0.0.0/0 on a router acting as an ABR/ASBR? Or do you
configure it only when it is an ASBR? HHMMMM? If anyone can answer this
one for me I'd surely appreciate it!
Scott
Sprint E|Solutions
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Anthony Pace
Sent: Tuesday, July 23, 2002 2:57 PM
To: ccie candidate; Louis Young; ccielab@groupstudy.com; Khurram Khani
Subject: Re: Any tips when doing OSPF NSSA stuff?
Is this correct: If you had an ASBR which was an ABR and used NSSA with
"no-redistribute" you would stop the LSA-7 routes from being pushed
into downstraem routers of the NSSA but the LSA-7 routes would go into
Area-0 and change into LSA-5 and the NSSA could still get the "LSA-3
0.0.0.0" via this ABR if the "no-summary" was used?
OR are you saying that "no-redistribution" simply keeps the LSA-7
routes from going into area 0, thereby isolating them to the NSSA? (in
which case I understood it backwards)
Anthony Pace
On Mon, 22 Jul 2002 13:00:50 -0700, "ccie candidate" <ccie1@lycos.com>
said:
> ok ;
> the NSSA is similar to stub area , where only LSA3 (inter-area ) can
> propagate inside the area , No LSA4 $ 5 is allowed.
> teh diffrenece is that when you have another routing protocol
> redistributing into the ospf domain ( something like rip or redist
> static ) and the redistributio point is one of the down stream routers
> of the NSSA , then an LSA7 will also propagate inside the area , when
> it reaches the ABR (which is propably connected to area 0) it gets
> converted into LSA5 and propagate inside the domain .
>
> here are some tips .
> 1-NSSA is does not propagate default route back to the down steam
> routes unless you add NO-Summary option
> area 30 nssa no-summary
>
> 2-when you have the ABR is also ASBR , you have another two options
for
> that command
>
> no-redistribution , will not allow the router to convert lsa7 to lsa5
>
> default-orginate , will propagate a default when the no-summary is not
> used .
>
> hope this helps
>
>
>
> --
>
> On Mon, 22 Jul 2002 11:28:21
> Khurram Khani wrote:
> >Look for scenario when NSSA ABR is also ASBR. It generates both Type
5 and
> >Type 7 LSAs.
> >
> >Thanks
> >Khurram
> >----- Original Message -----
> >From: "Louis Young" <tonyblair@etang.com>
> >To: <ccielab@groupstudy.com>
> >Sent: Monday, July 22, 2002 2:25 AM
> >Subject: Any tips when doing OSPF NSSA stuff?
> >
> >
> >> Hi all ,I was bewildered by some senarios about OSPF NSSA
stuff,anyone can
> >offer some general tips?
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