The ability to mark an interface as down when the remote end of the link is not available is used in order to remove any routes (specifically static routes) in the routing table that use that interface as the outbound interface. A consequence of this is that, by default, the local tunnel endpoint router does not have the ability to bring the line protocol of the GRE Tunnel interface down if the remote end of the tunnel is unreachable. This means that each tunnel endpoint does not keep any information about the state or availability of the remote tunnel endpoint. GRE tunnels are designed to be completely stateless. This document describes the different conditions that can affect the state of a Generic Routing Encapsulation (GRE) tunnel interface.
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