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JUNOSe 11.1.x Broadband Access Configuration Guide
server is integrated with SRC software. For more information, see SRC-PE Getting
Started Guide, Chapter 1, SRC Product Overview.
DHCP Relay Configuration
When you are configuring dynamic subscriber interface support, and you configure
DHCP relay in the same virtual router as the dynamic subscriber interfaces, you must
use the set dhcp relay inhibit-access-route-creation command to ensure that DHCP
replay does not install access internal routes. Otherwise, DHCP relay will overwrite
the access internal routes that are originally created for the subscriber interface.
Supported Configurations
E Series routers currently support dynamic creation of subscriber interfaces with
DHCP servers in the following configurations:
For example, Figure 21 on page 612 shows the interface stacking in an IP over Ethernet
dynamic subscriber interface configuration. The illustration indicates which layers
in the stack are static and dynamic, and identifies the CLI commands typically used
to create the configuration.
Figure 21: IP over Ethernet Dynamic Subscriber Interface Configuration
As shown in Figure 21 on page 612, issuing the ip auto-configure ip-subscriber
command configures the primary IP interface to enable dynamic creation of subscriber
interfaces. However, the router does not actually create the dynamic subscriber
interface until the DHCP server assigns an IP address to the associated subscriber.
To configure each supported configuration, see "Configuring Dynamic Subscriber
Interfaces" on page 622.
Packet Detection
For GRE tunnel interfaces, the event that triggers dynamic creation of subscriber
interfaces occurs when the router receives a packet with a source IP address that is
612
Dynamic Creation of Subscriber Interfaces
IP over Ethernet
IP over VLAN over Ethernet
IP over bridged Ethernet over ATM
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Troubleshooting
