For an AR with two outbound interfaces, NQA for static routes can be used to implement quick switchover from the active link to standby link

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For an AR with two outbound interfaces, Network Quality Analysis (NQA) for static routes can be used to detect faults of active and standby links in order to implement active/standby link switchover when the active link fails.
For the configuration example, see Example for Configuring NQA for IPv4 Static Routes.

Other related questions:
If an AR supports two outbound interfaces in active and standby mode, the external network cannot access the IP address of the interface on the standby link
An AR supports two outbound interfaces in active and standby mode. When the AR pings the IP address of the interface, it sends packets to the external network through the active link. However, it cannot be pinged because the source and destination IP addresses are different.

Does an AR support dual uplinks in active and standby mode
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.

What SMC2.0 version can implement the active-standby switchover and resource pool?
The SMC2.0 V100R003C10 version is recommended. The preceding functions can be implemented.

Problem and solution when the active/standby switchover is not performed sometimes when the interface is faulty
Check the HRP priorities on both firewalls. When the interface of the active firewall is faulty, the priority is decreased by 2. If the decreased priority is still higher than or equal to the priority of the standby firewall, active/standby switchover does not occur.

What is NQA association mechanism of the AR router
NQA association mechanism: Association indicates that NQA provides detection and notifies the associated module of the detection result. Then the associated module processes services based on the detection result. NQA can be associated with VRRP, static route, backup interface, IGMP proxy, IP address pool, DNS server, and PBR. Static route is used as an example: A static route with the next hop address of 192.168.0.88 is configured. If the next hop address of 192.168.0.88 is reachable, the static route is valid. If the next hop address of 192.168.0.88 is unreachable, the static route is invalid. After association is configured, the static route can be determined in real time. If NQA detects that the next hop address of 192.168.0.88 is unreachable, NQA notifies the static route module. The static route module determines that the static route is invalid.

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