From: Erick B. (erickbe@xxxxxxxxx)
Date: Thu Apr 25 2002 - 01:58:19 GMT-3
Hi,
OSPF Demand circuit basically justs stops the hello's
and sets the routes as DNA. It doesn't really control
the ISDN circuit dialing, etc.
If you're permitting all IP traffic to go across the
BRI/Dialer interface then when the router first comes
up OSPF (or other interesting traffic) will bring up
the BRI/Dialer interface and OSPF will form an adj,
etc. The demand-circuit options are part of this.
After the idle-timeout expires the BRI/Dialer
interface will disconnect. The OSPF adj over the ISDN
circuit will still be up since there are no hello's
sent, etc. The BRI/Dialer interface should stay quiet
after this. If it comes up, then there is something
bringing it up. It could be due to mutual-redist and
the BRI/Dialer IP net getting redist'd back into OSPF
or something, or another routing protocol broadcasting
out the BRI/Dialer int.
'show dialer' will give a reason for dialer coming up.
You can also do debugs (debug interface bri/dialer
with debug ip pack is helpful).
Erick
--- Babacar Diop <babacard2000@yahoo.com> wrote:
> Group,
>
> Can anyone clarify this for me. Which is true, 1 or
> 2?
>
> 1)When doing ISDN backup wiht OSPF demand-circuit,
> do
> you use it in conjunction with dialer-watch,
> floating-static, backup interface or snapshot
> routing?
>
>
> 2)Do you use "ip ospf demand-circuit" only by itself
> under the BRI. If so then you need then how do you
> bring up the line since you have to deny ospf with
> an
> access-list to keep it form bringing the line up.
>
> Thanks for your input
>
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