Does an AR support primary and secondary LNSs

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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.

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.

Method used to determine primary/secondary controllers
1. Method used to determine primary/secondary controllers: In the storage background: Determine primary/secondary controllers: Log in to the storage's MML mode and enter sys status. master indicates a primary controller. slave indicates a secondary controller. Determine primary/secondary controllers: Log in to the storage's CLI mode and enter showmaster. primary indicates a primary controller and secondary indicates a secondary controller. 2. Primary/Secondary switchover Note: Primary/Secondary switchover must be performed during off-peak hours. a. On the OSM GUI, choose System > System Information > Primary/Secondary Switchover. b. Log in to the storage's CLI mode, enter swapsys, and enter y when y or n is prompted.

Configure the primary and secondary IP addresses for a CE series switch
Configure the primary and secondary IP addresses for a CE series switch as follows: 1. Run the ip address ip-address { mask | mask-length } command in the interface view to configure the primary IP address for an interface. 2. Run the ip address ip-address { mask | mask-length } sub command in the interface view to configure the secondary IP address for an interface.

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