From: Stephens, Paul [Prof.Serv] (Paul.Andrew.Stephens@xxxxxxxxxx)
Date: Wed Feb 09 2000 - 06:03:08 GMT-3
Hi Vijay
I can ping every router from every router, OSPF is stable and the ISDN stays
down. It's not coming up at all, I left it all night. The only time it comes
up is of there is a topology change, which is what I would expect.
I'm a bit confused with what you said about the Virtual Link passing
throrugh R2. Are you saying that a VL can't span an Area and can only go
point-to-point ??
If I look at the Ospf Database on R3 it has entries for Area 0, Area 1 and
Area 2. Also the ospf process shows 3 interfaces in Area 1, one in Area 2
and 1 in Area 0, which I'm assuming is the VL.
This all looks ok, am I missing something ??
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: Vijaykrishna [mailto:vijaykrishna@netzero.net]
Sent: Wednesday, February 09, 2000 2:13
To: Vijaykrishna; Stephens, Paul [Prof.Serv];
ccielab@groupstudy.com
Subject: **Correction ospf demand circuits and
virtual-links
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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