ISDN behavior

From: Benny Chong (c_benny@hotmail.com)
Date: Fri Oct 25 2002 - 15:47:37 GMT-3

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Hi,

Is it true when I use ISDN as a backup of my primary link, no matter what
technologies I use, the ISDN link will only be up if there is interesting
traffic, otherwise, it will stay down? I am asking because because somehow
when I test Dialer Watch, the ISDN link always up, and I am not aware of any
interesting traffic passing the link, and after I play around with some
configuration, the ISDN link goes down. I just want to make sure which is
the normal behavior.

So, are these observations correct in theory:

Floating Static - The link goes up only if the floating route become the
active route and there is interesting traffic.

OSPF Demand Circuit - When OSPF topology changes, the ISDN will be up, but
after the dialer idle-timeout expire, the link will go down.

Backup Interface - ISDN link up when the monitoring primary link goes down,
but after the dialer idle-timeout expire, the link will go down.

Dialer Watch - When the watch route disappears, the ISDN link goes up, but
after dialer idle-timeout expire, the link will go down.

Snapshot routing - The ISDN link goes up according to the quiet and active
period timer settings.

So, in summary, in all cases, without interesting traffic, the ISDN link
will go down. Am I right?

Thanks!
Benny

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