Concept Guide

Table Of Contents
In Layer-3 GRE tunnels, IPv6 encapsulated in IPv4 and IPv4 encapsulated in IPv6 are not supported. The only Layer-3
GRE modes supported are IPv4 encapsulated in IPv4 and IPv6 encapsulated in IPv6.
You can direct traffic into the tunnel using a static route (by specifying the tunnel as the next hop for a static
route) or a session-based access control list (ACL).
Configuration Examples
Layer-2 GRE Tunnel
The following CLI command configures a Layer-2 GRE tunnel:
The following are the required configurations to create the Layer-2 GRE tunnel between controllers named
Controller-1 and Controller-2:
Controller-1 Configuration
(Controller-1) (config) # interface tunnel 101
description “IPv4 Layer-2 GRE 101"
tunnel mode gre 1
tunnel source vlan 10
tunnel destination 20.20.20.249
tunnel keepalive
trusted
tunnel vlan 101
Controller-2 Configuration
(Controller-2) (config) # interface tunnel 101
description “IPv4 Layer-2 GRE 101"
tunnel mode gre 1
tunnel source vlan 20
tunnel destination 10.10.10.249
tunnel keepalive
trusted
tunnel vlan 101
IPv4 Layer-3 GRE Tunnel
The following CLIcommand examples configure a Layer-3 GRE tunnel for IPv4 between two controllers.
The following are the required configurations to create the IPv4 Layer-3 GRE tunnel between controllers
named Controller-1 and Controller-2:
Controller-1 Configuration
(Controller-1) (config) # interface tunnel 202
description “IPv4 L3 GRE 101"
tunnel mode gre ip
ip address 1.1.1.1 255.255.255.255
tunnel source vlan 10
tunnel destination 20.20.20.249
trusted
Controller-2 Configuration
(Controller-2) (config) # interface tunnel 202
description “IPv4 L3 GRE 202"
tunnel mode gre ip
ip address 1.1.1.2 255.255.255.255
tunnel source vlan 20
tunnel destination 10.10.10.249
trusted
Dell Networking W-Series ArubaOS 6.5.x | Reference Guide interface tunnel | 473