Siemens SCALANCE W1750D CLI - Page 643

CLI Commands
4.18 U
SCALANCE W1750D CLI
Function Manual, 03/2019, C79000-G8976-C452-04
643
Usage Guidelines
Enforcing uplinks
The following configuration conditions apply to the uplink enforcement:
● When an uplink is enforced, the AP uses the specified uplink as the primary uplink
regardless of uplink preemption configuration and the current uplink status.
● When an uplink is enforced and multiple Ethernet ports are configured and uplink is
enabled on the wired profiles, the AP tries to find an alternate Ethernet link based on the
priority configured.
● When no uplink is enforced and preemption is not enabled, and if the current uplink fails,
the AP tries to find an available uplink based on the priority configured. The uplink with
the highest priority is used as the primary uplink. For example, if WiFi-sta has the highest
priority, it is used as the primary uplink.
● When no uplink is enforced and preemption is enabled, and if the current uplink fails, the
AP tries to find an available uplink based on the priority configured. If current uplink is
active, the AP periodically tries to use a higher priority uplink and switches to the higher
priority uplink even if the current uplink is active
Uplink Preemption
When no uplink is enforced and preemption is enabled, and if the current uplink fails, the AP
tries to find an available uplink based on in the priority configured. If current uplink is active,
the AP periodically tries to use a higher priority uplink and switches to the higher priority
uplink even if the current uplink is active.
Uplink Priority
When uplink priority is configured, the AP tries to get a higher priority link every ten minutes
even if the current uplink is up. This does not affect the current uplink connection. If the
higher uplink is usable, the AP switches over to that uplink. Preemption is enabled by
default.
Uplink Switchover
The default priority for uplink switchover is Ethernet and then 3G or 4G. The AP has the
ability to switch to the lower priority uplink if the current uplink is down.
Uplink Switching based on VPN Status
Scalance W supports switching uplinks based on the VPN status when deploying mixed
uplinks (Ethernet 0, 3G or 4G,Wi-Fi). When VPN is used with multiple backhaul options, the
AP switches to an uplink connection based on the VPN connection status instead of only
using Ethernet 0, the physical backhaul link.
The following configuration conditions apply to uplink switching:
● If the current uplink is Ethernet 0 and the VPN connection is down, the AP will retry to
connect to VPN. This retry time depends on the configuration of primary/backup and fast-
failover for VPN. If all the possibilities fail, then the AP waits for a vpn-failover-timeout and
then a different u plink (3G,Wi-Fi) is selected.
● If the current uplink is 3G or Wi-Fi, and Ethernet 0 has a physical link, the AP periodically
suspends user traffic to try and connect to the VPN on the Ethernet 0. If the AP
succeeds, then the AP switches to Ethernet 0. If the AP does not succeed, then the AP
restores the VPN connection to the current uplink.