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https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/118361-technote-gre-00.html
Aug 08, 2018 · Keepalives on the GRE tunnel interface are used in order to solve this issue in the same way keepalives are used on physical interfaces. With Cisco IOS ® Software Release 12.2(8)T, it is possible to configure keepalives on a P2P GRE tunnel interface. With this change, the tunnel interface dynamically shuts down if the keepalives fail for a ...
https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/118370-technote-gre-00.html
May 17, 2017 · A GRE tunnel is a logical interface on a Cisco router that provides a way to encapsulate passenger packets inside a transport protocol. It is an architecture designed to provide the services in order to implement a point-to-point encapsulation scheme.
https://community.cisco.com/t5/switching/3850-gre-support-in-hardware/td-p/2402487
GRE is now supported in Hardware with the right SW version. From the release notes in 3.7E http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3e/release_notes/rn-3dot7e-3850.html
https://community.cisco.com/t5/networking-documents/gre/ta-p/3115954
Generic Routing Encapsulation (GRE) is one of the available tunneling mechanisms which uses IP as the transport protocol and can be used for carrying many different passenger protocols. The tunnels behave as virtual point-to-point links that have two endpoints identified by the tunnel source and tunnel destination addresses at each endpoint.
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