From: beda jain (bpjain@xxxxxxxxx)
Date: Mon Jul 22 2002 - 17:20:33 GMT-3
Hi,
It is ask to back up when route learn over frame-relay is disappeared . so
when any route disappear there will be a
change in topology and isdn link will be up as per ip ospf demand circuit.
So i don't understand why ip ospf demand circuit will not work.
Dialer-watch will work, no doubt about it. But it will keep the link up
till the watch route will come up,
even though there is no traffic to send. But in ip ospf demand circuit the
route will be there in the route table via
isdn int but the isdn link will be down , it will come up when there will
any interesting traffic.
Could some body explain me why one will prefer dialer watch vs ip ospf
demand circuit.
Thanks,
Beda
At 12:47 PM 7/22/2002 -0700, yi c wrote:
>Thanks all who replied. The dialer watch will bring
>down the isdn link when the frame relay reappear, thus
>meets "ISDN link does not stay up indefinitely"
>requirement. I don't think ip ospf demand circuit is
>the answer, the only way to bring down the isdn link
>when using dialer watch sees the watched route in the
>routing table.
>
>I'm not sure what's the 'official' answer is, reading
>between lines is always a problem for me.
>
>Thanks,
>Chang
>--- beda jain <bpjain@cisco.com> wrote:
> > Hi,
> >
> > I think only ip ospf demand circuit will be the
> > answer.
> > You don't need dialer watch.
> > When ever there is a change in topology it will
> > bring the link up and then
> > after idle time out the link will
> > go down. Because hello packet are suppressed in
> > demand circuit.
> >
> > Let me if i am wrong.
> >
> > Thanks,
> > Beda
> > At 06:22 AM 7/22/2002 -0700, ying c wrote:
> > >Hi,
> > >
> > >Below is queston 16 from ECP1's final exam which I
> > >could not come up with any answer:
> > >
> > >"Configure dial backup so that R2 calls R1 when
> > routes
> > >learned over the Frame-Relay interface disappear.
> > Do
> > >not use the backup interface command. Make sure the
> > >ISDN link does not stay up indefinitely. (Include
> > the
> > >backup link in OSPF area 33)."
> > >
> > >The general requirement for this exam is no static
> > >route unless noted otherwise, which means I cannot
> > use
> > >the floating static. That makes me to think the
> > only
> > >option I have is to use dialer watch, but that will
> > >make the ISDN staying up until Frame-Relay network
> > >comes back up. Don't bother ip ospf demand-circuit
> > >with dialer watch, as when dialer idle-timeout
> > >expires, it will check the routing table and keep
> > the
> > >line up.
> > >
> > >Other than backup, floating static and dialer
> > watch,
> > >is there other way to solve this problem?
> > >
> > >By the way, please include me in the copy list when
> > >you send your reply, as I'm having troubles to
> > receive
> > >groupstudy emails recently.
> > >
> > >Thanks,
> > >Chang
> > >
> > >
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