Cabletron Systems SmartSwitch manual Configuring WAN Interfaces, Primary and Secondary Addresses

Chapter 22: WAN Configuration Guide

Using the same approach, a PPP high-speed serial interface (HSSI) WAN port located at router slot 3, port 2 would be identified as “hs.3.2”.

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 87 and “Configuring IPX Interfaces and Parameters” on page 248 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:

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

316 SmartSwitch Router User Reference Manual