324
| Uplink Configuration
Aruba Instant 6.5.0.0-4.3.0.0 | User Guide
l
When preemption is disabled and the current uplink goes down, the IAP tries to find an available uplink
based on the uplink priority configuration.
l
When preemption is enabled and if the current uplink is active, the IAP periodically tries to use a higher-
priority uplink, and switches to a higher-priority uplink even if the current uplink is active.
You can enable uplink preemption by using Instant UI or the CLI.
In the Instant UI
To enable uplink preemption:
1. Click
System > show advanced settings > Uplink
. The
Uplink
tab contents are displayed.
2. Under
Management
, ensure that the
Enforce Uplink
is set to none.
3. Select
Enabled
from the
Pre-emption
drop-down list.
4. Click
OK
.
In the CLI
To configure uplink preemption:
(Instant AP)(config)# uplink
(Instant AP)(uplink)# preemption
(Instant AP)(uplink)# end
(Instant AP)# commit apply
Switching Uplinks Based on VPN and Internet Availability
The default priority for uplink switchover is Ethernet and then 3G/4G. The IAP can switch to the lower-priority
uplink if the current uplink is down.
Switching Uplinks Based on VPN Status
Instant supports switching uplinks based on the VPN status when deploying multiple uplinks (Ethernet, 3G/4G,
and Wi-Fi). When VPN is used with multiple backhaul options, the IAP switches to an uplink connection based
on the VPN connection status, instead of only using the Ethernet or the physical backhaul link.
The following configuration conditions apply to uplink switching:
l
If the current uplink is Ethernet and the VPN connection is down, the IAP tries to reconnect to VPN. The
retry time depends on the fast failover configuration and the primary or backup VPN tunnel. If this fails, the
IAP waits for the VPN failover timeout and selects a different uplink such as 3G/4G or Wi-Fi.
l
If the current uplink is 3G or Wi-Fi, and Ethernet has a physical link, the IAP periodically suspends user traffic
to try and connect to the VPN on the Ethernet. If the IAP succeeds, the IAP switches to Ethernet. If the IAP
does not succeed, it restores the VPN connection to the current uplink.
Uplink switching based on VPN status is automatically enabled if VPN is configured on the IAP. However, you
can specify the duration in the
VPN failover timeout
text box to wait for an uplink switch. By default, this
duration is set to 180 seconds. The IAP monitors the VPN status and when the VPN connection is not available
for 3 minutes, the uplink switches to another available connection (if a low-priority uplink is detected and the
uplink preference is set to none). When
VPN failover timeout
is set to 0, uplink does not switch over.
When uplink switching based on the Internet availability is enabled, the uplink switching based on VPN failover
is automatically disabled.
Switching Uplinks Based on Internet Availability
You can configure Instant to switch uplinks based on Internet availability.