Check the following:
The configuration for the admin and public LANs has been designed
The network environment for the admin LAN is configured
The VLAN ID to allocate to the network resource has been configured
The virtual bridge has been configured beforehand
The MAC address range for the virtual network interface (VNIF) has been decided
When Using IBP
When using virtual L-Servers, after creating the IBP uplink sets to use for the public LAN and admin LAN, connect the IBP uplink sets to the VM host.
It is not necessary to use the same name for the uplink set and the name of the network resource.
Creating a virtual bridge
The virtual bridge is required on the admin OS, in order to connect the L-Server to the network.
For details on how to configure virtual bridges, refer to the manual for RHEL5-Xen and "8.4.4 Manual Network Configuration" in the "Setup Guide CE".