Does an AR support dual uplinks in active and standby mode

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An AR with dual WAN interfaces configured can support two uplink interfaces in active and standby mode.
1. Configure two static routes with different priorities. Generally, the data flow is sent out through the active link with a high priority. It is sent out through the backup link with a low priority only after a fault occurs on the active link.
2. Configure policy-based routing. Generally, the data flow is sent out through the active link through on policy-based routing. It is sent out through the standby link based on the default route in the routing table after a fault occurs on the active link.

Other related questions:
Does the AR support active and standby LNSs
The AR supports active and standby LNSs. When the active LNS fails, services are switched to the standby LNS and L2TP connection requests initiated by the LAC cannot reach the active LNS. The IP address of the standby LNS can be configured on the LAC. When the first address is unreachable, L2TP connection requests are sent to the second address based on the configuration sequence. A maximum of four LNS addresses can be configured on the AR.

Dual-controller active-active mode
Dual-controller active-active mode (also called as the active-active working mode): Both controllers are simultaneously active and concurrently process I/O requests initiated by application. If one controller fails or becomes offline, the other takes over services without affecting its own services. The active-active mode ensures robust system reliability using controller redundancy. In addition, this mode provides advantages, such as balancing service load, boosting system performance, and improving resource utilization.

Does an AR support two uplink interfaces in load balancing mode
If an AR has two WAN interfaces configured, the two uplink interfaces work in load balancing mode. 1. Configure two equal-cost static routes. 2. Configure policy-based routing to change the forwarding path of packets.

Configuring hot standby in load balancing mode on the USG2000
Search for "Connecting to the Internet through multi-ISPs (hot standby)" in the USG2000/5000 product documentation.

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