i have a gre tunnels configured on a 3845 router to remote 1811 routers. these tunnels does down sometimes and it gives this error:
Jun 1 15:44:30.097: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up
Jun 1 15:44:30.325: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel4, changed state to down
Jun 1 15:44:30.325: %OSPF-5-ADJCHG: Process 10, Nbr x.x.x.x on Tunnel4 from FULL to DOWN, Neighbor Down: Interface down or detached
i am running ospf , but the problem is that the tunnels stays stable for 2-3 days sometimes more and then the tunnel goes down.although nothing is changed on the network
any idea how to solve the problem?