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Hierarchy Level


The ARP cache limit for resolved next hops can be configured at an interface level. The benefit of configuring the ARP cache limit is to protect the device from DoS attacks.


After modifying the default ARP next-hop cache limit on an interface, you must deactivate and then reactivate the interface for the newly configured values to take effect.



Indicates the maximum number of routes to be held in the ARP cache.

  • Default:

    • 20,000 (ACX Series routers, EX2200, EX2200-C, EX3200, and EX3300 switches, SRX Series Firewalls)

    • 75,000 (EX4200, EX4300, EX4500, EX4550, and EX6210 switches, MX Series routers)

    • 100,000 (Other platforms)

  • Range: 1 through 2,000,000

Required Privilege Level

admin—To view this statement in the configuration.

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

Release Information

Statement introduced in Junos OS Release 16.1.