From: Adam Crisp (adam.crisp@totalise.co.uk)
Date: Wed Oct 02 2002 - 18:19:52 GMT-3
Peter,
Area 0 is special, it is different to Area 1 - or say area 10, in that is is
the Backbone.
You can have a router in Area 0 and 1, and it will pass type type 3 LSA
summary's between the areas. (in general as configured....)
You can have a router in Area 1 and 2, (not 0), but it will NOT pass(or
generate) type 3 LSA summary's between the areas.
Your R12 will not therefore exchange routes between areas - unless you
configure a Virtual link which links a bit of area 0 to the router and
enables it to
exchange route summaries (type 3 LSA's)
Hope this helps,
http://the.wall.riscom.net/books/other/Routing/OSPF/~abb/routing/ospf/techti
ps/ospf1.html
Adam
All areas need to touch the backbone and Routers which do this aer known as
ABR's
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Peter Wodle
Sent: 02 October 2002 18:52
To: ccielab@groupstudy.com
Subject: OSPF Design
I wonder if the following OSPF Design is valid/workable?
Have the area 0 with a no of routers. 1 ABR links area 0 to Area 1. another
ABR links area 0 to Area 2. So far no issues. But then we have R12 that
connects area 1 & area 2 togather i.e. R12 has one interface in area 1 and
one one interface in area 2. R12 has no interface in area 0. So, it is an
ABR (right?) but has no link to area 0. Could this could lead to area 1 &
area 2 exhange routes via this "backdoor" router?R12
Can we do this? I can see it is bad design but...
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