• Supported Platforms
• MX Series

• Related Topics
• Configuring Dynamic Subscriber Interfaces Using IP Demux Interfaces in Dynamic Profiles
• Attaching Dynamic Profiles to DHCP Subscriber Interfaces

Example: Configuring Subscribers on Dynamically Created VLAN Demux Interfaces

This example shows how to configure DHCP subscribers which reside on dynamically created (auto-sense) VLAN Demux Interfaces. DHCP triggers the dynamic creation of the demux interface when a subscriber logs in.

To configure subscribers on dynamic VLAN demux interfaces:

1. Enable VLAN tagging on the underlying interface that you plan to use for dynamically created VLAN demux interfaces.
   interfaces {ge-0/3/0 {vlan-tagging;}
2. Define the loopback interface.
   lo0 {unit 0 {family inet {address 90.1.1.1/24;}}}
3. Configure the creation of demux interfaces in the dynamic profile.
   dynamic-profiles {subscriber-profile {interfaces {demux0 {unit "$junos-interface-unit" {demux-options {underlying-interface "$junos-interface-ifd-name";}family inet; filter {input ingressFilter;output egressFilter;}mac-validate loose;}vlan-id $junos-vlan-id;}}}}}
4. Configure the access method used to dynamically create the demux interface.

   Note: DHCP relay is the access method used in this example.

   forwarding-options {dhcp-relay {server-group {router {100.20.42.1;}active-server-group erx;group one {interface demux0;interface-client-limit 200}}}