From: Chacko, Raj (RChacko@DRAFTNET.com)
Date: Tue Dec 13 2005 - 09:32:40 GMT-3
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
DRAFT - Ad Age's 2005 Top-Ranked, 5-Star Agency. This message is the
property of Draft, Inc., and contains information which may be privileged or
confidential. It is meant only for the intended recipients and/or their
authorized agents. If you believe you have received this message in error,
please notify us immediately by return e-mail or by forwarding this message
to postmaster@draftnet.com, and destroy any printed or electronic copies of
the message. Any unauthorized use, dissemination, disclosure, or copying of
this message or the information contained in it, is strictly prohibited and
may be unlawful. Thank you for your cooperation.
This archive was generated by hypermail 2.1.4 : Mon Jan 09 2006 - 07:07:51 GMT-3