Configuring Dhcp External Server To Control Preservation Of Dynamic Subscriber; Interfaces - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - BROADBAND ACCESS CONFIGURATION GUIDE 2010-10-12 Configuration Manual

Configuring DHCP External Server to Control Preservation of Dynamic Subscriber

Interfaces

Related
Documentation
Copyright © 2010, Juniper Networks, Inc.
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:
Issue the ip dhcp-external recreate-subscriber-interface command from Global
Configuration mode:
host1:vr1(config)#ip dhcp-external recreate-subscriber-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:
Issue the no ip dhcp-external recreate-subscriber-interface command from Global
Configuration mode:
host1:vr1(config)#no ip dhcp-external recreate-subscriber-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.
Preservation of Dynamic Subscriber Interfaces with DHCP External Server Overview
on page 521
Chapter 21: Configuring the DHCP External Server Application
527