You can connect Smart Access Gateway (SAG) devices to the Internet through both wired
and wireless connection. This implements high availability (HA). The wired connection
(active) is established over the WAN port whereas the wireless connection (standby)
is established over 4G. When an error occurs in the active connection, the SAG device
automatically switches to the standby connection. You can check the connectivity status
between your SAG devices and the Internet in the SAG console.
Prerequisites
A functional 4G subscriber identity module (SIM) card is purchased from your Internet
service provider (ISP) and inserted into the SAG device.
Background information
A 4G SIM card is included in the accessories of each SAG device. This card is used
to only receive configuration information from Alibaba Cloud, but cannot be used to
transmit data. To enable an SAG device to transmit data, we recommend that you purchase
a 4G SIM card from an Internet service provider (ISP). After you insert the card into
an SAG device, the card can provide standby network connections to the Internet over
4G. When an error occurs in the wired (active) network, the SAG device automatically
switches to the standby connection.
Procedure
- Log on to the Smart Access Gateway console.
- In the left-side navigation pane, click Smart Access Gateway.
- Find the target SAG instance and click the instance ID.
- On the instance details page, click the Configure High Availability tab.
- In the HA Configuration section, you can check the HA status of wired and wireless connections.
- Green: The network connection is available.
- Red: The network connection is unavailable.