I have seen this b4 when I configured Demand circut. First of all, OSPF will attempt send an update accross that ISDN line when somthing changs in the ospf database. So my guess is somthin is changing in the database (i.e. a route flap) Now, when I had this problem the router that was running OSPF /w demand circut and intiating the ISDN call was Mutally redistributing between 2 protocols (ospf and igrp)and because I was using a classess RP, IGRP, and running the same major NET on the eth and ISDN, IGRP was adv. the ISDN network. I was also running PPP over the ISDN link.
Here was my problem: OSPF dials the adjacent router to update. When a PPP session is estab. a host route gets installed on both PPP talkers (it's just the way PPP works do ask me why) When OSPF is done the BRI will go down. Here is the fun part :) That host route dissapears so that route is pulled from the ospf database adn from IGRP, but IGRP redistrbutes back to OSPF that the host route is gone and the MAXAGE of the OSPF DB changes and that is why OSPF dials again. The way that cisco recommends fixing this is to filter that host route from being redistributed into OSPF. That should fix the problem. I hope this helps :) Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=42377&t=42348 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
