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WAN Overview

354 Enterasys Xpedition User Reference Manual

Configuring WAN Interfaces

Configuring IP & IPX interfaces for the WAN is generally the same as for the LAN. You

can configure IP/IPX interfaces on the physical port or you can configure the interface as

part of a VLAN for WAN interfaces. However, in the case of IP interfaces, you can

configure multiple IP addresses for each interface. Please refer to Configuring IP Interfaces

and Parameters on page 96 and Configuring IPX Interfaces and Parameters on page 272 for more

specific information.

There are some special considerations that apply only to WAN interfaces; these are

detailed in this section.

Primary and Secondary Addresses

Like LAN interfaces, WAN interfaces can have primary and secondary IP addresses. For

Frame Relay, you can configure primary and secondary addresses which are static or

dynamic. For PPP, however, the primary addresses may be dynamic or static, but the

secondary addresses must be static. This is because the primary addresses of both the

local and peer routers are exchanged during IPCP/IPXCP negotiation.

Note: There is no mechanism in PPP for obtaining any secondary addresses from the

peer.

Static, Mapped, and Dynamic Peer IP/IPX Addresses

The following sections describe the difference between static, mapped, and dynamic peer

IP and IPX addresses and provide simple command line examples for configuration.

Static Addresses

If the peer IP/IPX address is known before system setup, you can specify the peer address

when the interface is created. This disables Inverse ARP (InArp) for Frame Relay on that

source/peer address pair; however, InArp will still be enabled for any other addresses on

that interface or other interfaces. A static peer address for PPP means that the address the

peer supplies during IP Control Protocol (IPCP) or IPX Control Protocol (IPXCP)

negotiations will be ignored.

The following command line displays an example for a port:

The following command line displays an example for a VLAN:

interface create ip IPWAN address-netmask 10.50.1.1/16 peer-address 10.50.1.2 port hs.3.1

interface create ip IPWAN address-netmask 10.50.1.1/16 peer-address 10.50.1.2 vlan BLUE

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Cabletron Systems SSIM-R8-02 Spécifications Page 374