I was just talking to a guy I work with about this and I thought it was an interesting scenario. It was his idea and my first thought was that it wasn't possible, but then after a little more pondering I decided that it might be possible. Note: 'possible' does not mean desirable. :-) Here's the scoop:
[A]-----------------[B] | \ | \ | \ | \ | \ | \ | \ [C] ----------- [D] Site A is connected to B, a disaster recovery facility, via frame relay. A also has point-to-point connections to sites C and D. C and D are connected via frame relay but obviously only use the frame relay link to reach A if their own primary link goes down. C and D have ISDN connections configured to dial B in case both links to A go away (Dialer Watch). Now for the twist.... What if you wanted to configure C to dial D when the load on its primary link reached a certain point, yet still dial B if both point-to-point links went down? I haven't completely figured out how to do this yet, but here's a start. You might configure two Dialer profiles, one for each destination. On the major interface on C you'd configure Dialer0 as your backup interface and configure an appropriate load. When the line utilization reaches that load, the router would dial Site D. Then you might configure Dialer Watch on Dialer1 and make it dialer Site B if routes originating from Site A disappear. The difficulty is that the Dialer interface that calls Site B would have to have absolute priority. If the primary link goes down, because Dialer0 is configured as a backup it might grab the BRI first. Even if it does get there first, when Dialer Watch kicks in, we'd have to have a way to clear the line immediately so Dialer1 could dial out. Is that possible? Admittedly, I'm a bit weak on DDR of this variety, but this sounded like an interesting brain teaser. Regards, John Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=36271&t=36271 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
