8 IP Routing
8-10 VPN 3000 Concentrator Series User Guide

External LSA Import

Click the drop-down menu button and select whether to bring in LSAs from neighboring Autonomous
Systems. LSAs describe the state of the AS router’s interfaces and routing paths. Importing those LSAs
builds a more complete link-state database, but it requires more processing. The choices are:
External = Yes, import LSAs from neighboring ASs (the default).
No External = No, do not import external LSAs.
Add or Apply / Cancel
To add this OSPF area to the list of configured areas, click Add. Or to apply your changes to this OSPF
area, click Apply. Both actions include your entry in the active configuration. The Manager returns to the
Configuration | System | IP Routing | OSPF Areas screen. Any new entry appears at the bottom of the OSPF
Area list.
Reminder: To save the active configuration and make it the boot configuration, click the Save Needed icon at the
top of the Manager window.
To discard your entries, click Cancel. The Manager returns to the Configuration | System | IP Routing | OSPF
Areas screen, and the OSPF Area list is unchanged.
Configuration | System | IP Routing | DHCP
This screen lets you configure DHCP (Dynamic Host Configuration Protocol) parame ters that apply to
DHCP functions within the VPN Concentrator. You can use external DHCP servers to assign IP
addresses to clients as a VPN tunnel is established.
If you check Use DHCP on the Configuration | System | Address Management | Assignment screen, you must
configure at least one DHCP server on the Configuration | System | Servers | DHCP screens. You configure
global DHCP parameters here.
Figure 8-8: Configuration | System | IP Routing | DHCP screen
Enabled
Check the box to enable DHCP functions within the VPN Concentrator. The box is checked by default.
To use DHCP address assignment, you must enable DHCP functions here.