From: Mark Mahan (mmahan@caprock.com)
Date: Mon Nov 05 2007 - 15:23:46 ART
What about a GRE tunnel between R4 and S1 in Area 0 if the task didn't
specifically say use a virtual-link?
The filter-list only filters type 3 LSAs so you could potentially let in
type 5 LSAs. BTW the default from the default-information-originate is
an LSA type 5. You also have to filter on S1 and depending on your
topology you could kill reach ability to S1 networks.
There is a database-filter interface command that bocks all LSAs but
again you'd kill reach ability. The very reason a virtual link cannot
go through a stub is that packets sent towards routes aren't tunneled
but travel natively through the area and stub areas do not have a full
view of the network.
Mark Mahan
Network Engineer
-------------------------------
CapRock Communications
4400 S. Sam Houston Parkway E.
Houston, Texas 77048
Office: 832 668 2528
mmahan@caprock.com
www.caprock.com
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Alex Steer
Sent: Monday, November 05, 2007 10:47 AM
To: ccielab@groupstudy.com
Subject: ospf virtual-link over totally stubby area
Hi,
I got completely stuck on this question I hoped someone maybe able to
help me
out. The topology is as follows
AREA 0=Router4====area 47=====Switch1=area0
The question was (word for word):-
Configure OSPF area 47 on the Ethernet segment between R4 and SW1
Devices in OSPF area 47 should only receive LSA of type 1, 2 and a
default of
type 3.
To me that says configure Router 4 with "area 47 stub no-summary"
The problem then is that I cant configure a virtual-link to SW1s area0.
Is the answer on router4:-
configure area47 as normal area
configure "default-information orginate always" on router4
configure "area 47 filter-list prefix prefix-list"
ip prefix-list prefix-list permit 0.0.0.0/0 le 32
Can anybody suggest for sure?
Many thanks
Alex
This archive was generated by hypermail 2.1.4 : Sat Dec 01 2007 - 06:37:28 ART