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GRE Tunnel Interface States and What Impacts Them - Cisco

    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 ...

GRE Tunnel Keepalives - Cisco

    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.

Solved: 3850 GRE Support in Hardware? - Cisco Community

    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

GRE - Cisco Community

    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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