Riverstone Networks WICT1-12 - Manual (Page 606)

30-2 Riverstone Networks RS Switch Router User Guide Release 8.0
Configuring WAN Interfaces WAN Configuration
For example, you would specify a frame relay serial WAN port located at router slot 4, port 1, on VC 100 as
“se.4.1.100.”
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.”
30.2 CONFIGURING WAN INTERFACES
Configuring IP and 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. Refer to
Section 11.2,
"Configuring IP Interfaces and Parameters" and Section 23.4, "Configuring IPX Interfaces and Parameters" for
more specific information.
There are some special considerations that apply only to WAN interfaces. These are detailed in this section.
30.2.1 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.
30.2.2 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:
rs(config)# interface create ip IPWAN address-netmask 10.50.1.1/16 peer-address
10.50.1.2 port hs.3.1