From: Vijaykrishna (vijaykrishna@xxxxxxxxxxx)
Date: Tue Feb 08 2000 - 23:12:44 GMT-3
Here is the corrected version ! sorry for the mistake
The problem I see here is (don't consider the ISDN yet)......
R2 learns about area2/R4 from the backbone; since all the interarea traffic
needs to go via area0 for R2 the next hop for area2 is R1 (ABR for area0),
whereas for area0 the area2/R4 is reachable via the VL which passes through
R2 so the next hop is R2, so there is a loop between R1 and R2 !!
>
>I have seen this practically...does any one see this problem or am I
missing
>something ??
>
>thanks,
>Vijay
>
>-----Original Message-----
>From: Stephens, Paul [Prof.Serv] <Paul.Andrew.Stephens@compaq.com>
>To: 'ccielab@groupstudy.com' <ccielab@groupstudy.com>
>Date: Tuesday, February 08, 2000 1:53 PM
>Subject: FW: ospf demand circuits and virtual-links
>
>
>>I think there are a couple of scenarios for this problem. The one I have
>>been working on today is as follows
>>
>>
>>Area 0 --- R1 --- Area 1 ---- R2 ------ Area 1 ----- R3 ----- Area 2 -----
>R
>>4
>> [ [
>> [---------------------ISDN----------------------[
>>
>>I have Virtual link from R3 to R1 across Area 1 and ip ospf demand-circuit
>>of R3 only. The way I got it to work was to put both end of the ISDN in
>Area
>>1. It works fine that way, but if you put them area 0 the Isdn just stays
>up
>>all the time. If you put the ends in different area it gets really
>confused.
>>
>>I'm going to try it now with the Isdn in another area, say Area 3 and see
>>what that does. I suspect this is the one where you need multiple virtual
>>links.
>>
>>
>>Paul Stephens
>>
>>UK INI Network Consultant
>>Networks and Systems Integration Services
>>Compaq Computer Ltd
>>
>>*mailto:paul.andrew.stephens@compaq.com
>><mailto:paul.andrew.stephens@compaq.com>
>>* Mobile +44 7818 457948
>>
>>
>>
>> -----Original Message-----
>> From: Curtis Phillips [mailto:phillipscurtis@netscape.net]
>><mailto:[mailto:phillipscurtis@netscape.net]>
>> Sent: Tuesday, February 08, 2000 17:36
>> To: ccielab@groupstudy.com
>><mailto:ccielab@groupstudy.com>
>> Subject: ospf demand circuits and virtual-links
>>
>> There has been some talk about the demand-circuit command
>>not repressing
>> ospf hellos when configured in a virtual-link circuit. Can
>>anyone verify this?
>> Also, if so, under what circumstance and what is the remedy?
>>
>> Thanks,
>>
>> Curtis
>>
>>
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