From: Christian Sica (csica@liweb.net)
Date: Tue Dec 13 2005 - 13:27:10 GMT-3
Raj,
Sounds like your making progress. Configure area 34 as per the solution and
see what happens. Look at the routing table and OSPF database and see what
is going on. The solution does work, and since you have it, it is easy to
configure. However, take this opportunity to see what is going on,
understand what the router is doing. You must be understand each of the
different area types and how they work, Cisco is sure to test your
understanding of this. And as you mention, yes, there should be a network
statement for the loopback. It is in the solution.
Regards,
Christian
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Chacko, Raj
Sent: Tuesday, December 13, 2005 7:33 AM
To: 'Christian Sica'; Chacko, Raj; 'Cisco certification'
Subject: RE: IE Vol2, LAB3, OSPF (sec 5.1-3, 5.6-8)
Christian,
Thanks for the explanation; indeed this is a tricky OSPF lab, but I
still don't see how they are able to fulfill the requirement "R3 should
generate a default route to R4 via OSPF..." in section 5.2 One of the other
problems I had with the tunnel was with the fact that my tunnel source was
pointing to my interface and not an IP address causing an adjacency failure.
Also, On R4, shouldn't there be a statement like 'network 150.1.4.0
0.0.0.255 area 0' I don't find this in the solutions guide.
After reading your e-mail I realize that R4 is attached to area 0, hence
there is no need for area 34 to be an NSSA. Rip routes will be redistributed
without any issues.
Thanks again,
Raj
-----Original Message-----
From: Christian Sica [mailto:csica@liweb.net]
Sent: Monday, December 12, 2005 11:12 PM
To: 'Chacko, Raj'; 'Cisco certification'
Subject: RE: IE Vol2, LAB3, OSPF (sec 5.1-3, 5.6-8)
Hi Raj,
This is indeed a tricky lab, but it is very good at teaching you how OSPF
works and shows you some twisted and warped ways of configuring it. Both R3
and R4 are ABR's due to the fact that the loopbacks of all OSPF routers are
in area 0. NSSA will violate the requrements as it states you must suppress
all inter-area & external OSPF routes. Routes redistributed from RIP on
either router would be advertised to each other as an external LSA. To
block all external LSA's, both type 5 & 7, you must configure a totally
stubby area. This is why the "stub no-summary" is configured on both
routers. All routes that are redistibuted will be known by area 0, but will
never be exchanged or advertised into area 34. As far as the tunnel is
concerned, the source and destination on both ends is the frame relay ip.
Since you are not allowed to add subnets to this lab, using the "ip
unnumbered loopback 0", you are essentially borrowing loopback 0's ip
address for communication across the tunnel interface. Then by configuring
the ospf network statement, ospf will be activated on the tunnel, since it
is using loopback 0's ip address, and will send out hello's, thus forming an
adjacency over the tunnel connecting area 0 together on R3 & R4.
HTH,
Christian
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Chacko, Raj
Sent: Monday, December 12, 2005 10:32 PM
To: Cisco certification
Subject: IE Vol2, LAB3, OSPF (sec 5.1-3, 5.6-8)
Hi Group,
I have a few questions with the way this section is
designed.
1. R4 is an ABR and an ASBR, (in order to redistribute RIP) should we not
configure area 34 as nssa ?
2. Why do they have the 'no-summary' turned on both R3 and R4 (IE solution
configurations have the 'no-summary' turned on)
3. The loopback 0 on R4 is supposed to be in area 0; the tunnel created to
solve this problem is not advertised in any routing process (nor is the
unnumbered interface - lo0).
The solution provided seems to be missing some things.
TIA
Raj
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