Concept Guide

229 | VPN Configuration Dell Networking W-Series Instant 6.5.1.0-4.3.1.0 | User Guide
(Instant AP)(config-tunnel)# tunnel source <controller-IP>
(Instant AP)(config-tunnel)# tunnel destination <AP-IP>
(Instant AP)(config-tunnel)# trusted
(Instant AP)(config-tunnel)# tunnel vlan <allowed-VLAN>
Configuring Aruba GRE Parameters
The Aruba GRE feature uses the IPsec connection between the W-IAP and the controller to send the control
information for setting up a GRE tunnel. When Aruba GRE configuration is enabled, a single IPsec tunnel
between the W-IAP cluster and the controller, and one or several GRE tunnels are created based on the Per-AP
tunnel configuration on the W-IAP. For Aruba GRE, no manual configuration is required on the controller to
create the GRE tunnel.
Aruba GREis supported only on Aruba Controllers running ArubaOS 6.4.x.x or later versions.
In the Instant UI
To configure Aruba GRE:
1. Click the More > VPN link located directly above the Search bar in the Instant UI. The Tunneling window is
displayed.
2. Select Aruba GRE from the Protocol drop-down list.
3. Enter the IP address or the FQDN for the main VPN/IPsec endpoint in the Primary host text box.
4. Enter the IP address or the FQDN for the backup VPN/IPsec endpoint in the Backup host text box. This
entry is optional. When you enter the primary host IP address and backup host IP address, other details are
displayed.
5. Specify the following parameters. A sample configuration is shown in Figure 52.
a. To allow the VPN tunnel to switch back to the primary host when it becomes available again, select
Enabled from the Preemption drop-down list. This step is optional.
b. If Preemption is enabled, specify a value in seconds for Hold time. When preemption is enabled and
the primary host comes up, the VPNtunnel switches to the primary host after the specified hold time.
The default value for Hold time is 600 seconds.
c. To allow the W-IAP to create a backup VPN tunnel to the controller along with the primary tunnel, and
maintain both the primary and backup tunnels separately, select Enabled from the Fast failover drop-
down list. If this option is enabled, when the primary tunnel fails, the W-IAP can switch the data stream
to the backup tunnel. This reduces the total failover time to less than one minute.
d. To disconnect all wired and wireless users when the system switches during VPNtunnel transition from
primary to backup and backup to primary, set Reconnect user on failover to Enabled.
e. To configure an interval for which wired and wireless users are disconnected during a VPN tunnel switch,
specify a value in seconds for Reconnect time on failover within the range of 30–900 seconds. By
default, the reconnection duration is set to 60 seconds.
f. Specify a value in seconds for Secs between test packets. Based on the configured frequency, the W-
IAP can verify if an active VPN connection is available. The default value is 5 seconds, which means that
the W-IAP sends one packet to the controller every 5 seconds.
g. Enter a value for Max allowed test packet loss to define a number for lost packets, exceeding which
the W-IAP can determine that the VPNconnection is unavailable. The default value is 2.
h. Select Enabled or Disabled from the Per-AP tunnel drop-down list. The administrator can enable this
option to create a GRE tunnel from each W-IAP to the VPN/GRE endpoint rather than the tunnels
created just from the master W-IAP. When enabled, the traffic to the corporate network is sent through
a Layer-2 GRE tunnel from the W-IAP itself and need not be forwarded through the master W-IAP.