From: mark.2.johnson@bt.com
Date: Thu Jan 08 2009 - 10:21:28 ARST
Hi Nitro,
I wasn't under the impression that LSA 1's were advertised into area 0
via ABR as type 4's, my understanding is that all LSA 1 and 2's were
sent as summary LSA's into the relevant area as LSA type 3's, LSA 4's
indicate the ASBR's that are advertised into the area for external
routes learnt from the ABR.
Regards,
Mark Johnson
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Pavel Bykov
Sent: 08 January 2009 12:10
To: Nitro Drops
Cc: ccielab@groupstudy.com
Subject: Re: OSPF NSSA
Intra area routes, the LSA 1 and 2, are never propagated into another
area.
They are always "summarized":
LSA 1 -> LSA 4
LSA 2 -> LSA 3
Therefore LSA 1 in area 0 is LSA 4 in Area 51, and LSA 2 in area 0 is
LSA 3 in Area 51
On Thu, Jan 8, 2009 at 12:36 PM, Nitro Drops <nitrodrops@hotmail.com>
wrote:
> Hi All,
>
> just to verify on this concept.
>
> Task - Configure OSPF Area 51 so that neither inter and intra-area
> routes are permitted into Area51 via ABR R1
>
> BB1 f0/0 > RIP > f0/0 R5 f0/1 > OSFP Area 51 > f0/0 R1 f0/1 > Area 0
> R5 - ASBR doing mutual redistribution
> R1 - ABR
>
> My understanding is only 'NSSA' is allowed in this scenario because of
> the external routes from BB1, and by making R1 'nssa no-summary' and
> R5 'nssa', only LSA1,2, default 3 are allowed into Area 51 via ABR R1.
>
> How do i go about preventing 'intra-area' routes from entering Area51
> via ABR R1? i did a simple test, created another loopback on R1 and
> advertised it into Area51. The only way is to use a distribute-list on
> R5 to filter it off, in this manner, the intra-area routes are still
> permitted into Area51 via ABR R1.
>
>
> Cheers
> Nit
>
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