From: Michael Whittle (mgwhittle@gmail.com)
Date: Sun Mar 16 2008 - 12:55:43 ART
Hi all,
I have a problem I'm actually working on at work but is related to the CCIE
lab studies. I'm stuck and don't understand why OSPF is behaving a certain
way. I had to convert a flat OSPF network into a segregated network using
multiple areas split by a firewall. What I did was created a separate area
for each customer and trunked those areas into a PIX using multiple VLAN's.
The PIX is running OSPF on each VLAN and advertising a default route into
each area. Each area is advertising it's routes to the PIX. The PIX has full
visibility of all the networks in the areas. Now I know that you will need a
backbone area 0 to route between these areas. I thought adding one of the
core networks on the PIX into area 0 might be enough to get this working but
it seems not. Do you actually need to pass traffic through area 0 for areas
to communicate or is it enough for the ABR to just contain an area 0 and
other areas?
I'm able to communicate between all areas without a problem because the PIX
knows about all networks and receiving them correctly. All the areas need is
the default route to get the traffic to the PIX. The problem I have is one
of those areas now needs some of the specific routes from one of the other
areas. There's no filtering in place but for some reason the destination
area is only receiving a default route and nothing else. It's just a
standard area and I'm just originating a default route. What am I missing
here? Originating a default route on a PIX shouldn't suppress other routes
would it?
Cheers,
Mike
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