A Wide Area Network (WAN) port can connect a private network to Alibaba Cloud. This topic describes how to configure a WAN port for a Smart Access Gateway (SAG) device in the SAG console.
Background information
The WAN ports of an SAG device support static IP addresses, dynamic IP addresses, and Point-to-Point Protocol over Ethernet (PPPoE). You can configure WAN ports to connect private networks to Alibaba Cloud. The WAN ports of SAG devices also support bandwidth throttling and quality of service (QoS) policies, which improve bandwidth usage. For more information about QoS policies, see What is a QoS policy?.
- An SAG-1000 device uses port 5 as the WAN port by default. You can manually specify other ports as WAN ports on an SAG-1000 device. For more information, see Assign a role to a port.
- The number of WAN ports supported by an SAG-100WM device is based on the device type. Type 2 devices support multiple WAN ports. Type 1 devices support only one WAN port. The exterior of Type 1 and Type 2 devices is different. For more information about Type 1 and Type 2 devices, see Descriptions of SAG-100WM.
The following table describes the features and control conditions of WAN ports.
Feature | Control condition | Description |
---|---|---|
WAN failover for high network availability | Priority | If you have configured multiple WAN ports for an SAG device, you can set the priority
of each WAN port.
The port that has the highest priority is used as the active port. Ports that have lower priorities are used as standby ports. Network traffic that goes through the SAG device is forwarded through the active port. If the active port is down, network traffic is automatically switched to a standby port. Valid values of the priority: -1 and 1 to 50. A smaller value represents a higher priority. A value of -1 indicates that the port is not used to forward network traffic. |
Load balancing |
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If the WAN ports are assigned the same priority, you can specify an ISP and a weight
for each WAN port. This way, network traffic is forwarded by the ports based on their
ISPs and weights.
SAG devices redirect network traffic to ISP lines based on the destination IP addresses of data packets. If the WAN ports are assigned the same ISP or the SAG device cannot match the network traffic with an ISP, the system redirects the network traffic to different ISPs based on the weight of each WAN port. Note
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