Juniper JUNOSE SOFTWARE 11.0.X - BROADBAND ACCESS CONFIGURATION GUIDE 4-1-2010 Configuration Manual page 654

JUNOSe 11.0.x Broadband Access Configuration Guide
ip demux-type da-prefix
ip destination-prefix
ip share-interface
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Configuring Static Subscriber Interfaces
Use to create an IP interface to share a layer 2 interface.
Use the specified name to refer to the shared IP interface; you cannot use the
layer 2 interface to refer to the shared IP interface, because the shared interface
can be moved.
Example
host1(config)#interface ip si0
Use the no version to delete the IP interface.
See interface ip
Use to specify that the router use a destination address to demultiplex traffic for
the subscriber interface.
Example
host1(config-if)#ip demux-type da-prefix
Use the no version to restore the default situation in which the router uses a
source address to demultiplex traffic.
See ip demux-type da-prefix
Use to specify a destination address for a subscriber interface or for a primary
IP interface.
On the ERX1440 Broadband Services Router or the E320 router, you can configure
up to 1024 subnets for static subscriber interfaces per primary IP interface when
each subnet has a variable network mask that is less than /32. The number of
subnets identifying a single route (/32) is still limited by the global maximum of
16,000 hosts per line module.
Example
host1(config-if)#ip destination-prefix 196.168.2.2 255.0.0.0
Use the no version to remove the association between the interface and the
specified IP destination address and mask.
See ip destination-prefix
Use to specify the layer 2 interface for this IP interface to share. The command
fails if the layer 2 interface does not yet exist.
If you issue this command on a shared IP interface, you cannot issue the ip
share-nexthop command for the interface.
After creating the shared IP interface, you can configure it as you do any other
IP interface.