From: Dan (dp595@xxxxxxxxxxxxx)
Date: Thu Apr 12 2001 - 17:04:56 GMT-3
If you do it that way you'll have to configure the ISDN as a "demand
circuit" so that the OSPF LSAs do not age out and the hellos do not keep the
line up. Being that OSPF does not perform unequal cost load-balancing, and
assuming that your Serial link bandwidth statement is higher than your ISDN
link bandwidth statement, all traffic should flow over the Serial link as
long as it remains up and is able to route.
I would determine what is correct or incorrect depending on the
instructions given. If you are told not to use the "backup interface"
command, then you'll either have to use the solution you have presented here
or floating statics (again unless you are told not to).
Of course some things are a matter of descretion. Although I might be able
to get away with using the "backup interface" command for backing up a
frame-relay connection, I would probably choose floating statics or dialer
watch because I believe that "backup interface" for a frame-relay
connnection is a poor design due to the fact that it does not protect
against routing problems, dlci mapping problems, etc.
Just my opinion.
Dan Pontrelli
Customer Installation Engineer - Verio NYC
CCNP, MCSE, CNA
> Is it incorrect lab-wise to use dial backup without putting the backup
> interface command on the interface you wish to back up? If both your
primary
> interface (say s0) were running ospf as well as your backup interface
(bri0)
> then when s0 fails ospf will reconverge and the bri0 line will come up
> anyway.Therefore would the backup interface command be necessary?
> Regards,
> Steve
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