Controller Based WLANs

How to setup  L2 GRE Tunnel between Aruba Controller and Mobility Access Switch(MAS)?

Layer-2 GRE tunnels allow us to have the same VLAN in multiple locations (separated by a Layer-3 network) and be connected. The forwarding method for a Layer-2 GRE tunnel is bridging.
However, the drawback of using Layer-2 GRE tunnels is that all broadcasts are flooded through the tunnel, adding traffic load to the network 
 

Configuration on CLI
=====================

    SYNTAX
    =======
    
        Controller
        ==========
        interface tunnel <id>
            description <description>
            tunnel mode gre 0
            tunnel source <Controller-ip vlan>
            tunnel destination <switch-ip>
            trusted
            tunnel <vlan to be tunneled>
        !

        MAS
        ====
        interface tunnel ethernet <id>
            switching-profile "vlan to be tunneled"
            source-ip <Switch-ip vlan>
            destination-ip <Controller-ip>
        !

    EXAMPLE
    =======

        Controller
        ==========
        interface tunnel 1
            description "Tunnel Interface"
            tunnel mode gre 0
            tunnel source vlan 193
            tunnel destination 10.17.169.226
            trusted
            tunnel vlan 50
        !

        MAS
        ====
        interface tunnel ethernet "1"
            switching-profile "vlan50"
            source-ip vlan 185
            destination-ip 10.17.170.227
        !

1. Check the output "show ip interface brief" and the tunnel interface should show UP.

2. Ping either side of the L3 tunnel interface and it should be pingable.

3. Connect a laptop  on either sides and ping each other and it should ping.