[c-nsp] silly ospf question -- unequal cost paths

[Ashe Canvar]

Oliver and John,

Thank you for your replies. I will look at the Route explorer.

Otherwise i'll work on hacking some perl to look at the link state
database and run Dijkstra. Again the problem is ...how do i verify
that what I have done is what the router will do...maybe  going by the
RFC/STD would not be a bad idea, but no guarantees.

Regards,
-ansh




On 1/4/06, Roland Dobbins <rdobbins at cisco.com> wrote:
>
> Route Explorer from Packet Design does some pretty cool/useful
> visualizations based on routing information:
>
>        http://www.packetdesign.com/products/rex.htm
>
>
> On Jan 3, 2006, at 10:44 PM, Oliver Boehmer ((oboehmer)) wrote:
>
> > Ashe Canvar <> wrote on Wednesday, January 04, 2006 2:03 AM:
> >
> >> I have multiple possible ospf paths between router A and B. Is there
> >> any way I can see all possible paths available between A and B and
> >> their respective costs.
> >
> > No.
> >
> >> Does the OSPF shortest path calculation happen from the linkstate
> >> database  when the primary path fails and this is the reason that the
> >> backup paths or higher cost paths cannot be displayed when they are
> >> not active ?
> >
> > Yes, more or less. IOS doesn't display the entire active "path"
> > either,
> > it just shows the next-hop along its SPF.
> >
> >> This is terribly confusing when trying to troubleshoot or understand
> >> a topology.
> >
> > Well, I usually use network diagrams to understand a new topology ;-)
> > I think there are tools around to create topology maps based on
> > link-state databases (as all the info is in there), but I don't recall
> > their names.
> >
> >       oli
> >
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> ----------------------------------------------------------------------
> Roland Dobbins <rdobbins at cisco.com> // 408.527.6376 voice
>
>      Everything has been said.  But nobody listens.
>
>                    -- Roger Shattuck
>
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