From: Rick Burts (burts@xxxxxxxxxxxxxx)
Date: Sun Aug 19 2001 - 05:59:13 GMT-3
Your solution is correct. If you think about what your did: on the ABR
(R3) you used area range to summarize interarea routes. When you created
a virtual link on R1 you made R1 an ABR and need to use area range to
summarize interarea routes.
Rick
Rick Burts, CCSI CCIE 4615 burts@mentortech.com
Mentor Technologies 240-568-6500 ext 6652
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On Sun, 19 Aug 2001, Voytek Mielczarek wrote:
> This has been discussed here many times, but there is always a new question t
o an old scenario... Lets say we have a network as below (based on Hutnik "CCIE
Lab Practice Kit" p.234).
> All shown links are serial or ethernet, except R1-R5 which is ISDN backup lin
k that is activated when link R4-R5 goes down.
>
> R1 ---- R2
> |\ /
> | \ / area3
> | \ /
> | \/
> | R3
> | | area 0
> | |
> | R4
> | | area 1
> area2 | |
> ----R5-----R6 IGRP
> |
> area2 ---
>
>
> Q1 is to summarise interarea routes from area 3 to area 0, so you apply "area
3 range x.x.x.x y.y.y.y"
> and a couple of routes from R4 are gone and a summary route added, DONE.
>
> Q2 is to provide connectivity to area 2, so you create a virtual link across
area 1, DONE.
>
> Q3 configure ISDN to backup the serial R4-R5 link, so another virtual link mu
st be configured between R1 and R3 in order to provide connectivity from area 2
to area 0 via ISDN when activated, DONE.
>
> NOW, when a virtual link in configured between R1 and R3, internal routes fro
m area 3 appear again on router R4 (because we extended area 0 to R1), so we ha
ve to go back to Q1 to fix it!
> And the fix that appears to be working is configuring exactly the same statem
ent on R1, as we used on router R3 which was "area 3 range x.x.x.x y.y.y.y". An
d that removed again the interarea routes from R4 leaving only the summary rout
e as required in Q1.
>
> Any comments? Is that the right solution?
>
> Regards, Voytek
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