# ip source-prefix

#### Syntax

[ no ] ip source-prefix ipAddress ipAddressMask deny

#### Release Information

Command introduced before JunosE Release 7.1.0.

#### Description

Configures a subscriber interface or a primary IP interface that is enabled for dynamic creation of subscriber interfaces to demultiplex traffic with the specified IP address and mask. The no version removes the association between the interface and the specified IP address and mask.

#### Options

- ipAddress—IP address of the physical interface that receives messages for this subscriber
- ipAddressMask—Network mask for associated IP subnet
- deny—Filters packets matching this command

#### Mode

Interface Configuration, Subinterface Configuration