3Com Switch 8800 Family IPsec Module Configuration and Command reference Guide

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tunnel-protocol gre Syntax
tunnel-protocol gre
undo tunnel-protocol
View
Tunnel interface view
Parameter
gre: Encapsulation protocol of the tunnel.
Description
Use the tunnel mode command to set encapsulation mode of the tunnel
interface to GRE.
By default, the encapsulation protocol of tunnel interface is GRE. Under the GRE
mode, users can execute and view the GRE related commands, whereas other
relevant commands are available under other modes.
Related command: interface tunnel.
Example
# Create a tunnel between SecBlade_VPN1 and SecBlade_VPN2, with
encapsulation protocol being GRE and transport protocol being IP.
[SecBlade_VPN1-Tunnel3] tunnel-protocol gre
[SecBlade_VPN2-Tunnel2] tunnel-protocol gre