VPN Configuration
19.2 Configuring a Tunnel from an AP to a Mobility Controller
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5.
Specify the following parameters. A sample configuration is shown in Figure
ArubaGRE
Configuration
.
–
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.
–
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.
–
To allow the AP 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 AP can switch the data stream to the backup tunnel. This reduces the total
failover time to less than one minute.
–
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.
–
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.
–
Specify a value in seconds for Secs between test packets. Based on the configured
frequency, the AP can verify if an active VPN connection is available. The default
value is 5 seconds, which means that the AP sends one packet to the controller every
5 seconds.
–
Enter a value for Max allowed test packet loss to define a number for lost packets,
exceeding which the AP can determine that the VPN connection is unavailable. The
default value is 2.
–
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 AP to the VPN/GRE endpoint
rather than the tunnels created just from the master AP. When enabled, the traffic to
the corporate network is sent through a Layer-2 GRE tunnel from the AP itself and
need not be forwarded through the master AP.
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