Uplink Configuration
26.5 Uplink Preferences and Switching
SCALANCE W1750D UI
Configuration Manual, 02/2018, C79000-G8976-C451-02
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Switching Uplinks Based on Internet Availability
You can configure SCALANCE W to switch uplinks based on Internet availability.
When the uplink switchover based on Internet availability is enabled, the AP continuously
sends Internet Control Management Protocol (ICMP) packets to some well-known Internet
servers. If the request is timed out due to a bad uplink connection or uplink interface failure,
and the public Internet is not reachable from the current uplink, the AP switches to a different
connection.
You can set preferences for uplink switching by using the SCALANCE W UI and the CLI.
In the SCALANCE W UI
To configure uplink switching:
1. Click System > show advanced settings > Uplink. The Uplink tab contents are displayed.
2. Under Management, configure the following parameters:
●
VPN failover timeout — To configure uplink switching based on VPN status, specify the
duration to wait for an uplink switch. The default duration is set to 180 seconds.
●
Internet failover — To configure uplink switching based on Internet availability, perform
the following steps:
–
Select Enabled from the Internet failover drop-down list.
–
Specify the required values for the following parameters:
Max allowed test packet loss
The maximum number of ICMP test packets that are allowed to be lost to determine if
the AP must switch to a different uplink connection. You can specify a value within the
range of 1 – 1000.
Secs between test packets
The frequency at which ICMP test packets are sent. You can specify a value within the
range of 1 – 3600 seconds.
Internet check timeout
Internet check timeout is the duration for the test packet timeout. You can specify a
value within the range of 0–3600 seconds and the default value is 10 seconds.
●
Internet failover IP — To configure an IP address to which the AP must send AP packets
and verify if the Internet is reachable when the uplink is down. By default, the master AP
sends the ICMP packets to 8.8.8.8 IP address only if the out-of-service operation based
on Internet availability (internet-down state) is configured on the SSID.
3. Click OK.
Note
When is enabled, the AP ignores the VPN status, although uplink switching based on VPN
status is enabled.
In the CLI
To enable uplink switching based on VPN status:
(scalance)(config)# uplink
(scalance)(uplink)# failover-vpn-timeout <seconds>