
Chapter 60 Configuring the WAN resources 521
BCM 4.0 Networking Configuration Guide
Configuring multiple IP addresses for a WAN interface
You can assign up to five IP addresses to a single WAN interface that is configured to use frame
relay. Using this functionality, you can configure the BCM as the hub in a hub and spoke
configuration. When BCM is the hub or central site, BCM can provide at least two IP address
classes on the primary WAN interface. This allows the system to provide Direct Mode capability.
Examples of uses of multiple IP addresses
• You can use a single WAN physical link to connect to both an intranet and the internet using
separate addressing schemes.
• A network service provider can create a separate IP address for management functions over
the WAN interface.
In both of these examples, broadcast traffic destined for one IP address would not be transmitted
on the links associated with the other IP address.
Restrictions when using multiple IP addresses
• Nortel does not recommend using more than two IP address classes.
• Multiple IP addresses supports RIP and OSPF.
• IPSec does not support the use of these multiple IP addresses for Branch Office Local
Endpoint Addresses, Remote Endpoint Addresses or the Destination IP Address for IPSec
VPN Clients.
Note: Refer to “Additional IP addresses are not blocked” on page 694 for
important information regarding additional IP addresses for the WAN
interface.
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