From: Senthil Kumar (senthil.kumar@intechnology.co.uk)
Date: Mon Nov 04 2002 - 13:30:14 GMT-3
shouldnt happen, make sure the subnetmask of monitored routers are same in
the dialerwatch list and in the routing table.. otherwise your understanding
is fine..
also remember snapshot routing doesnt understand vlsm routing protocols, so
you need on-demand for ospf and dialer watch for eigrp. snapshot can help
rip but rip 2 is vlsm..so again dialerwatch could help.
-----Original Message-----
From: Benny Chong [mailto:c_benny@hotmail.com]
Sent: 25 October 2002 19:48
To: ccielab@groupstudy.com
Subject: ISDN behavior
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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