Does the AR support active and standby LNSs

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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.

Other related questions:
Does an AR support primary and secondary LNSs
L2TP supports primary and secondary LNSs. When the primary LNS fails, services are switched to the secondary LNS. However, L2TP connection requests initiated by the LAC cannot reach the primary LNS. To ensure that L2TP connection requests are sent to the secondary LNS, you must configure the IP address of the secondary LNS on the LAC, so that the LAC sendsthe request packets to the address of the secondary LNS when the first IP address is unreachable. A maximum of four LNS addresses can be configured.

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.

Can L2TP be used in scenarios where active and standby LNSs are deployed
L2TP can be used in scenarios where active and standby LNSs are deployed. When the active LNS fails, services are switched to the standby LNS. However, L2TP connection requests initiated by the LAC cannot reach the active LNS. To ensure that L2TP connection requests are sent to the standby LNS, you must configure the IP address of the standby LNS on the LAC, so that when the first IP address is unreachable, the LAC sends the request packets to the address of the standby LNS. You can configure IP addresses of a maximum of four LNSs on the LAC.

Do AR routers support dual SIM cards in being configured as active and backup links
AR routers support the dual SIM cards in being configured as the active and backup links that are connected to different LTE networks. The active SIM card is used for communications in general. If the RSSI of the main SIM card is lower than the threshold, the traffic switches over to the backup SIM card. When the RSSI of the active SIM card is higher than the threshold, the traffic switches over from the backup SIM card to the active SIM card.

Does the SCU board on the U1960 support the active/standby deployment mode?
The SCU boards on the U1981 and U1980 support the active/standby mode. For other U1900 models, each model supports only one SCU board and has only one slot for housing the board.

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