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high-availability-options (Aggregated Multiservices)


Hierarchy Level


Configure the high availability options for the aggregated multiservices (AMS) interface. For service applications, if only the load-balancing feature is being used, then this configuration is optional.

For many-to-one (N:1) high availability support for service applications like Network Address Translation (NAT), the preferred backup services PIC, in hot standby mode, backs up one or more (N) active services PICs.


In both cases, if one of the active services PICs goes down, then the backup replaces it as the active PIC. When the failed PIC comes back up, it becomes the new backup. This is called floating backup.

One-to-one (1:1) high availability support associates a single backup interface with a single active interface. 1:1 configuration is supported only on the MS-MPC and MX-SPC3. In 1:1 (stateful) configurations, synchronization causes the active and back up PICs to synchronize traffic states and data structures, preventing data loss during a failover event. Stateful synchronization is required for IPsec high availability support. For IPsec connections, AMS supports 1:1 configuration only.

The remaining statements are explained separately. See CLI Explorer.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 11.4.

Support added in Junos OS Release 19.3R2 for Next Gen Services on MX Series routers MX240, MX480 and MX960 with the MX-SPC3 services card.