Hello,
I have a network, routed with OSPF, I have 2 routers with separate internet connection. I want to have failover, if one internet is down, then to access it through second internet.
I have enabled distribute-default if-installed-as-type-2 on each router, set cost to prefer the primary internet and enabled ping of gateway.
Everything is working in first hour, if I disconnect the primary, then everywhere on the network the default route changes to backup. But after approximately on hour more, If I do the same, the default to primary disappears from routing table and the backup way does not appear and the network is without internet.
This happens even in case I switch secondary internet router to act as primary by changing the COST.
If I look into OSPF LSA, i see there the default route of the backup, but it is not transfered to ROUTING table.
ROS v 4.16
Any idea what to do?