Concept Guide

When the uplink switchover based on Internet availability is enabled, the W-IAP 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 W-IAP switches to a different connection.
You can set preferences for uplink switching by using the Instant UI and the CLI.
In the Instant 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:
l 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.
l Internet failover—To configure uplink switching based on Internet availability, perform the following
steps:
a. Select Enabled from the Internet failover drop-down list.
b. Specify the required values for the following parameters:
n Max allowed test packet loss—The maximum number of ICMP test packets that are
allowed to be lost to determine if the W-IAP must switch to a different uplink
connection. You can specify a value within the range of 1–1000.
n 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.
n 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.
l Internet failover IP—To configure an IP address to which the W-IAP must send W-IAP packets and
verify if the Internet is reachable when the uplink is down. By default, the master W-IAP 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.
When Internet failover is enabled, the W-IAP ignores the VPN status, although uplink switching based on VPN
status is enabled.
In the CLI
To enable uplink switching based on VPN status:
(Instant AP)(config)# uplink
(Instant AP)(uplink)# failover-vpn-timeout <seconds>
(Instant AP)(uplink)# end
(Instant AP)# commit apply
To enable uplink switching based on Internet availability:
(Instant AP)(config)# uplink
(Instant AP)(uplink)# failover-internet
(Instant AP)(uplink)# failover-internet-ip <ip>
(Instant AP)(uplink)# failover-internet-pkt-lost-cnt <count>
(Instant AP)(uplink)# failover-internet-pkt-send-freq <frequency>
(Instant AP)(uplink)# end
(Instant AP)# commit apply
Dell Networking W-Series Instant 6.5.1.0-4.3.1.0 | User Guide Uplink Configuration | 326