From: Earl Aboytes (earl@xxxxxxxxxxxx)
Date: Wed Feb 09 2000 - 11:26:59 GMT-3
What version IOS are both of you running? I had heard that some versions of IO
S do this and others do not.
You should be able to specify an OSPF demand-circuit and that should keep the l
ink down with or without the virtual link but some versions of the IOS do not.
I do not know which versions. Can anyone verify this? I am running 12.04T an
d it works fine.
Earl
At 09:03 AM 2/9/00 +0000, Stephens, Paul [Prof.Serv] wrote:
>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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