Configuring Dhcp External Server To Control Preservation Of Dynamic Subscriber Interfaces - Juniper JUNOSE 11.1.X - BROADBAND ACCESS CONFIGURATION GUIDE 6-4-2010 Configuration Manual

JUNOSe 11.1.x Broadband Access Configuration Guide
Related Topics
Configuring DHCP External Server to Control Preservation of Dynamic Subscriber
Interfaces
You can configure the DHCP external server application to delete and re-create the
dynamic subscriber interface after a bound client restarts the discovery process on
the its primary IP interface. By default, the DHCP external server preserves the
existing dynamic subscriber interface in this situation.
Deleting and re-creating the dynamic subscriber interface for a DHCP client may
trigger additional authentication, authorization, and accounting (AAA) services if AAA
is configured on the router. Therefore, issuing the ip dhcp-external
recreate-subscriber-interface command to delete and re-create the dynamic
subscriber interface is useful if you want to use AAA services to validate and collect
subscriber information during a restart of the DHCP discovery process.
Preserving the client's dynamic subscriber interface is useful if deleting and re-creating
the dynamic subscriber interface might result in a service interruption.
To enable the DHCP external server application to delete and re-create the dynamic
subscriber interface after a bound client restarts the discovery process on its primary
IP interface:
To restore the DHCP external server default behavior to preserve the dynamic
subscriber interface after a bound client restarts the discovery process on its primary
IP interface:
NOTE: If you are upgrading the JUNOSe software on the router from a release in
which the DHCP external server deleted and re-created the dynamic subscriber
interface by default, you must explicitly issue the ip dhcp-external
recreate-subscriber-interface command in the current release to delete and re-create
the dynamic subscriber interface. The router no longer deletes and re-creates the
dynamic subscriber interface by default in this situation.
For a list of the JUNOSe releases in which deleting and re-creating the dynamic
subscriber interface was the default behavior for the DHCP external server, see DHCP
External Server in the Known Behavior section of the JUNOSe Release Notes.
532

Configuring DHCP External Server to Control Preservation of Dynamic Subscriber Interfaces

ip dhcp-external auto-configure
Issue the ip dhcp-external recreate-subscriber-interface command from Global
Configuration mode:
host1:vr1(config)#ip dhcp-external recreate-subscriber-interface
Issue the no ip dhcp-external recreate-subscriber-interface command from
Global Configuration mode:
host1:vr1(config)#no ip dhcp-external recreate-subscriber-interface