we have a problem with ospf and dialer backup: all routers are connected to two central routers. The central routers are connected to each other. All connections are GRE tunnels over IPSec via only one interface on each router.
All interfaces of the routers are in OSPF area 0.
Backup: If one of the central routers ISP-line goes down the other routers should dial in using a watch-group. The other central router must be first because there is only one ISDN line.
The problem is: as soon as the line goes down the central router (smallest OSPF dead-timer) distributes the loss of the route to all other routers and all try to dial in simultanously.
Is there a way to configure the routers so that the second central router dials in first?
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