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Re: isdn - backup - challenge - authentication ??? posted 03/07/2003
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hi,

thanks for the information.
now i want to deny the rip updates. 


> There are reasons for the ISDN demand circuit to flap.
> topology change on the OSPf network somewhere.
> and i see u are redistributing rip.
> disallow any rip updates in the dialer list.
> also about your question R1 is not allowed to
> authenticate.
> This means you need to configure PPP
> authentication(pap or chap) callin  on R2.
> This means only R2 is authenticated by R1 but R1 is
> not by R2.
> 

i wait for a time but the router dial more than 10 times.....and never
stop..;-)



> 
> Initially when you configure demand-circuit it
> typcially goes up and down for a while until the
> database are synchronised. 
> once that is done it should settle down unless
> something changes somewhere on the network not
> necessarily on OSPF but in rip which gets
> redistributed
> into OSPF.
> 
> let me know if that helps/
> 
> --- tria_ka@xxxxxxx wrote:
> > hi group,
> > 
> > actual i configure some isdn environments for
> > preparing for the lab.
> > now i'm a littlie confused about what to do and
> > exactly what is the mean of
> > the sample questions.
> > assume the following:
> > 
> >
> R1-------ethernet--------(ospf)-R2-(RIP)---------------R3
> > (RIP)
> > |               ospf a0         |
> > |_______isdn backup_____________|
> > 
> > R1/R2 speaks ospf and R3 only RIP. Distribution is
> > on R2.
> > 
> > Q:isdn should put in ospf area while ethernet
> > between R1/R2 too. The same
> > area.
> > isdn shoul act as backup but without the backup
> > statement.
> > The isdn link should not flap.
> > 
> > also R1 NOT allowed to authenticate.
> > sometimes i also confused about anything like this:
> > Rx...shoud not
> > challenge.
> > what does it mean exactly with not challenge??
> > 
> > first i configure this scenarium without
> > authentication and want to test
> > ospf demand-circuit.
> > but the link always stay up and if it go down there
> > comes a broadcast
> > 224.0.0.5 and bring it up.
> > i think with the demand statement there are no ospf
> > packets about this link
> > ??
> > 
> > any help ? thanks
> > 
> > udo
> > 
> > -- 
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