From: Ali (muali_cisco@xxxxxxxxxxx)
Date: Tue Feb 12 2002 - 04:44:19 GMT-3
Remember, OSPF is a linkstate protocol -- key word "link". In your drawing
router a has one link in area 1 and one in area 0, making it an ABR. So
router a will maintain two LSDataBases, one for area 1 and the other for
area 0. Similarly router b will maintain two LS Databases. Key point to
remember "all the routers in one area maintain the same LSDatabase for that
area"
Adjacencies Database -- list of all neighbors (directly connected neighbors)
LS Database -- State of all link (Identical for all routers in that area)
Routing Table -- Best path to each network (Calculated after running SPF on
the LSDatabase)
Regards
Ali
----- Original Message -----
From: "Ouellette, Tim" <tim.ouellette@eds.com>
To: <cisco@groupstudy.com>
Cc: <ccielab@groupstudy.com>
Sent: Monday, February 11, 2002 11:05 PM
Subject: Simple OSPF LS database question
> Hey all, while listening to the CCIE power session tapes, something just
> popped into my mind. I understand that each router in an ospf area has to
> have a complete understanding of the topology. My question is that in my
> little cheasy drawing here, routera has an interface in area 1 and area 0,
> and routerb has an interface in both area 0 and area 2. Does routera and
> routerb have an identical LS database for area 0 but they will have a
> seperate LS database topology view for area 1 (routera) and area
2(routerb)?
> Maybe i'm just missing a concept here. Thanks!
>
> ---Area 1 (routera) -----area 0----(routerb) --- area 2
>
>
> Tim
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