Configuring Dynamic Subscriber Interfaces For Interoperation With Dhcp Relay And Dhcp Relay Proxy - Juniper JUNOSE 11.1.X - BROADBAND ACCESS CONFIGURATION GUIDE 6-4-2010 Configuration Manual

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Configuring Dynamic Subscriber Interfaces for Interoperation with DHCP Relay
and DHCP Relay Proxy
When you configure the DHCP relay application or the DHCP relay proxy application
in the same virtual router (VR) as the DHCP external server application, we
recommend that you define interface profiles to create the dynamic subscriber
interfaces when the primary IP interface is static. Otherwise, the gateway IP address
(giaddr) used for DHCP rebind or renewal requests might be inconsistent. Renewal
requests apply only when DHCP relay proxy is configured in the same VR as DHCP
external server.
The use of inconsistent giaddrs results in the transmission of negative
acknowledgment (NAK) messages from the DHCP server and the removal of existing
DHCP client bindings.
To apply an interface profile to a dynamic subscriber interface:
1.
2.
3.
4.

Configuring Dynamic Subscriber Interfaces for Interoperation with DHCP Relay and DHCP Relay Proxy

Preservation of Dynamic Subscriber Interfaces with DHCP External Server
Overview on page 525
ip dhcp-external recreate-subscriber-interface
Define the interface profile.
host1(config)#profile dsiTest
host1(config-profile)#ip unnumbered loopback 5500
host1(config-profile)#exit
Define a route map in the VR in which the static primary IP interface resides.
host1(config)#virtual-router relay
Proceed with new virtual-router creation? [confirm]
host1:relay(config)#route-map dsiTest
host1:relay(config-route-map)#set ip interface-profile dsiTest
host1:relay(config-route-map)#exit
Define a loopback interface with a host mask in the VR in which the static primary
IP interface resides.
host1:relay(config)#interface loopback 5500
host1:relay(config-if)#ip address 71.23.1.2/32
Enable the static primary IP interface to support creation of dynamic subscriber
interfaces, and apply the route map to the IP interface subscriber in the static
primary IP interface configuration.
host1:relay(config)#interface fastEthernet 5/5.100
host1:relay(config-if)#ip unnumbered loopback 5500
host1:relay(config-if)#ip auto-configure ip-subscriber exclude-primary
host1:relay(config-if)#ip route-map ip-subscriber dsiTest
Chapter 21: Configuring the DHCP External Server Application
533