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Static route of which next-hop intf is GRE tunnel remains even if the tunnel is down
The tunnel has 'ip unnumbered dialer' for its ip address configuration.
Use 'ip unnumbered loopback' or configure ip address directly. or Configure the static route with tracking object option which monitor tunnel interface status; track 10 interface tunnel 1 line-protocol ip route 0.0.0.0 0.0.0.0 tunnel1 10
This might be seen on GRE tunnels over PPPoE.
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