From: Ed Lui (edwlui@gmail.com)
Date: Sat May 07 2005 - 20:18:09 GMT-3
Bruce,
I have been following your "Suggested order of performing DOiT labs"
and not quite there at Lab#3. I was quite curious when I saw Dennis
posting. After finish/repeat reading that part, was not understand why
as well.
Checked out your BBS and saw some explaination from another
instructor. But still didn't understand what you guys were talking
about. Until I read your e-mail plus I actually labbed it up, remove
the virtual link, reapply the virtual link again and so on for a few
times. It blew my head off. Now I understand what are you trying to
teach us!!! Wow!
Thanks a lot!
Ed Lui
On 5/7/05, Andrew B. Caslow <abcaslow@netmasterclass.net> wrote:
> Dennis,
>
> This virtual-link is configured over the ISDN link for backup/redundancy
> purposes. If the Frame-Relay link between R1 and R2 goes down completely, R2
> would lose its connection to Area 0. By using the ISDN link between R1 and
> R2 and by configuring a virtual-link over this ISDN link (the ISDN link is
> in OSPF Area 12), R2 can reach OSPF Area 13 link residing between R1 and R3.
>
> To get a much better explanation of this issue download the DOiT Scenario 3
> Answer Key on the NMC CCIE Preparation Web Portal and go to pp 23-24. There
> is an explanation and a nice little diagram describing this very issue.
>
> If you have any problems accessing the answer key or navigating the NMC CCIE
> Preparation Web Portal, please let me know.
>
> I hope this helps.
>
> Best regards,
>
> -Bruce Caslow CCIE #3139
> NetMasterClass, LLC
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Dennis J. Hartmann
> Sent: Friday, May 06, 2005 9:05 PM
> To: 'Bob Sinclair'; ccielab@groupstudy.com
> Subject: NMC #3
>
> I'm having a hard time figuring out why NMC scenario #3 calls for a
> virtual link for area 12 when area 12 is connected to the backbone area on
> both R2 and R2.
>
> Is there a rule that OSPF areas can only have one connection to the
> backbone area (one ABR)?
>
> Is this because R1 in this scenario connects Area 13, area 0, and area
> 12 and this violates OSPF connectivity rules?
>
> Please advise.
>
> Sincerely,
>
> Dennis J. Hartmann
>
> White Pine Communications
>
> dh8@pobox.com
>
> CCSI#23402/CCIP/CCNP/CCDP/CCNA/CCDA
>
> Cisco IP Voice Support & Design Specialist
>
> Cisco Optical, VPN & IDS Specialist
>
> MCSE
>
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