User's Manual

5. Click Apply.
In the CLI
Use the following commands:
(host)(config) #interface tunnel id
tunnel keepalive [<interval> <retries>]
Configuring GRE Tunnel Group
ArubaOS provides redundancy for L3 generic routing encapsulation (GRE) tunnels. This feature enables
automatic redirection of the user traffic to a standby tunnel when the primary tunnel goes down.
To enable this functionality, you must:
l configure a tunnel-group to group a set of tunnels.
l enable tunnel keepalives on all the tunnel interfaces assigned to the tunnel-group, and
l configure the session ACL with the tunnel-group as the redirect destination.
GRE Tunnel Redundancy is not applicable for GRE tunnels created for communications between controllers and APs.
Creating a Tunnel Group
A tunnel-group is identified by a name or number. You can add multiple tunnels to a tunnel-group. The order
of the tunnels defined in the tunnel-group configuration specifies their standby precedence. The first member
of the tunnel-group is the primary tunnel. When the first tunnel fails, the second tunnel carries the traffic. The
third tunnel in the tunnel-group takes over if the second tunnel also fails. In the mean time, if the first tunnel
comes up, it becomes the most eligible standby tunnel.
You can configure up to 32 tunnel-groups on a controller with a maximum of five tunnels in each tunnel-group.
You can also enable or disable pre-emption as part of the tunnel-group configuration. Pre-emption is enabled
by default. The pre-emption option, automatically redirects the traffic whenever it detects an active tunnel with
a higher precedence in the tunnel-group. When pre-emption is disabled, the traffic gets redirected to a higher
precedence tunnel only when the tunnel carrying the traffic fails.
You can configure the tunnel-group using the WebUI or the CLI.
In the WebUI
1. Navigate to the Configuration > Network > IP > GRE Tunnels page.
2. Click Add under the Tunnel Group pane.
3. Specify a name for the tunnel-group in the Tunnel Group Name text box.
4. Specify the tunnel IDs with comma separators in the Tunnel Group Member text box.
5. Select the Enable Preemptive-Failover Mode check box to enable pre-emption (Default: enabled); clear
the checkbox to disable pre-emption.
6. Click Apply.
In the CLI
Execute the following commands to configure a tunnel-group:
(host)(config) #tunnel-group <tunnel-group-name>
(host)(config-tunnel-group)# tunnel <tunnel-id>
Dell Networking W-Series ArubaOS 6.4.x | User Guide Network Configuration Parameters | 170