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mode (Interfaces)



Hierarchy Level

Release Information

Statement introduced before Junos OS Release 7.4.

Statement introduced in Junos OS Release 15.1F6 for PTX Series routers with third-generations FPCs installed.


Check whether the packet has a source address with a corresponding prefix in the routing table. If a corresponding prefix is not found, unicast reverse path forwarding (RPF) loose mode does not accept the packet. Unlike strict mode, loose mode does not check whether the interface expects to receive a packet with a specific source address prefix.

In strict mode, unicast RPF checks whether the incoming packet has a source address that matches a prefix in the routing table, and whether the interface expects to receive a packet with this source address prefix. If the incoming packet fails the unicast RPF check, the packet is not accepted on the interface.


If you do not include this statement, unicast RPF is in strict mode.

Required Privilege Level

interface—To view this statement in the configuration.

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