From: tria_ka@gmx.net
Date: Wed Mar 12 2003 - 03:29:59 GMT-3
hi,
> Can it be that changes in the OSPF topology have occured?
yes that is also what i understand but i don't know why there is a change
every time.
if i have a look on ip ospf database normally it's really stable. when i
configure bri on both sides for isdn the link comes up changes lsa, the go
down....and up again....every time...no stopping !!..;-(
> When using OSPF on demand, it is my understanding that the ISDN link comes
> up initially and learns the network.
>
> I also have read that every time a change in the topology is sensed, the
> ISDN circuit comes up again to keep itself current with an accurate
> topology. (When the primary goes down, network operation depends on the
> ISDN
> routes to be an accurate view of the network. Imagine a primary that
> hasn't
> gone down in months. If the ISDN didn't keep updated, it would be
> worthless
> as a backup that is meant to give an IMMEDIATE alternate route when the
> primary goes down.)
>
> I have also read that OSPF On Demand is not recommended in parts of the
> OSPF
> network where changes occur frequently --- because the ISDN link will keep
> going up and down. It is recommended that it be used on Stub links.
uuppss that is what i don't try. i also heard there is sometimes a problem
with virtual links ? so there is also a virtual link !!
keep it the isdn line up ?
thanks
udo
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Jonathan V Hays
> Sent: Tuesday, March 11, 2003 2:21 PM
> To: ccielab@groupstudy.com
> Subject: RE: isdn - backup - challenge - authentication ???
>
>
> > -----Original Message-----
> > From: tria_ka@gmx.net [mailto:tria_ka@gmx.net]
> > Sent: Tuesday, March 11, 2003 1:47 PM
> > To: Jonathan V Hays
> > Cc: ccielab@groupstudy.com
> > Subject: RE: isdn - backup - challenge - authentication ???
> > Hi Jonathan,
> > thanks. That is what I also know ..,;-)) I can read the debug
> > output...
> > But I don't understand WHY this MC packet trigger my isdn
> > line to go up.
> > Both isdn bri if's are in the ospf state 'running on demand' !
> > any comments ? help ??
> > thanks
> > udo
> >
> > > The dial reason is 224.0.0.5 which is one of the OSPF multicast
> > > addresses.
>
> Udo,
>
> Possibly something is not allowing a complete OSPF database
> sychronization between the two routers. Or maybe it's OSPF
> authentication that hasn't been configured across a virtual link. It's
> hard to tell with what little information you have provided.
>
> Please post your configuration files for both routers.
>
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