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

JunosE 11.3.x Broadband Access Configuration Guide
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Configuring the DHCP External Server to Support the Creation of Dynamic Subscriber
Interfaces
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to ignore the giaddr when determining the next hop for the subscriber access routes. The
E Series router then uses Address Resolution Protocol (ARP) to discover the subscriber's
IP address and sends the traffic to the learned IP address.
To configure the DHCP external server application to ignore the giaddr when determining
the next hop for the subscriber access routes:
Issue the ip dhcp-external disregard-giaddr-next-hop command from Global
Configuration mode:
host1(config)#ip dhcp-external disregard-giaddr-next-hop
ip dhcp-external disregard-giaddr-next-hop
You can configure the DHCP external server to support the creation of dynamic subscriber
interfaces. This configuration requires that the user's DHCP control traffic and data traffic
traverse the same client-facing ingress port on the E Series router.
You must use the ip dhcp-external auto-configure command within a specific virtual
router context.
To configure the DHCP external server to support the creation of dynamic subscriber
interfaces:
Issue the ip dhcp-external auto-configure command from Global Configuration mode:
host1(config)#ip dhcp-external auto-configure
To configure the DHCP external server to support the creation of dynamic subscriber
interfaces built over dynamic VLANs that are based on the agent-circuit-id option
(suboption 1) of the option 82 field in DHCP messages, include the agent-circuit-identifier
keyword.
Issue the ip dhcp-external auto-configure command with the agent-circuit-identifier
keyword from Global Configuration mode:
host1(config)#ip dhcp-external auto-configure agent-circuit-identifier
The use of the option 82 field enables you to stack an IP interface that is associated
with a particular subscriber over a dynamically created VLAN; the VLAN is dynamically
created based on the agent-circuit-id option (suboption 1) that is contained in the
DHCP option 82 field.
For information about configuring agent-circuit-id–based dynamic VLAN subinterfaces,
see the Configuring Dynamic Interfaces Using Bulk Configuration chapter in JunosE Link
Layer Configuration Guide.
ip dhcp-external auto-configure
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