Concept Guide
230 | VPN Configuration Dell Networking W-Series Instant 6.4.3.1-4.2.0.0 | User Guide
(host)(config-tunnel)# tunnel destination <AP-IP>
(host)(config-tunnel)# trusted
(host)(config-tunnel)# tunnel vlan <allowed-VLAN>
Configuring Dell GRE Parameters
The automatic GRE feature uses the IPSec connection between the W-IAP and controller to send the control
information for setting up a GRE tunnel. When automatic 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 Dell GRE, no manual configuration is required on the controller to
create the GRE tunnel.
DellGREis supported only on Dellcontrollers running ArubaOS 6.4.x.x or later versions.
In the Instant UI
To configure Dell GRE in the UI:
1. Click the More > VPN link at the top right corner of the Instant UI. The Tunneling window is displayed.
2. Select Aruba GRE from the Protocol drop-down list.
3. Enter the IP address or FQDN for the main VPN/IPSec endpoint in the Primary host field.
4. Enter the IP address or FQDN for the backup VPN/IPSec endpoint in the Backup host field. This entry is
optional. When you enter the primary host IP address and backup host IP address, other fields are
displayed.
5. Specify the following parameters. A sample configuration is shown in Figure 53.
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 VPNtunnel 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 or Disabled from the Fast
failover drop-down list. If 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 VPNtunnel 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, after which the
W-IAP can determine that the VPNconnection 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.