Table of Contents
Advertisement
DSL LAN Extender 400 User's Guide
Appendix C: DSL LAN Extender Routing Models
Before configuring the DSL LAN Extender device, you should take time to understand the DSL LAN
Extender's routing model. This will make planning your network and configuring the DSL LAN
Extenders much easier.
This chapter provides information on the DSL LAN Extender's routing and bridging capabilities, and
shows some typical application environments. It will also cover the routing related features unique to the
CP side. All example applications will have key parameters shown to make overall picture clear.
Summary of DSL LAN Extender Routing and Bridging Capabilities
A minimum system consists of an DSL LAN Extender pair; one side is configured as a CO (Central
Office) device and the other as a CP (Customer Premises) device. Each side is then connected to an
Ethernet network, and traffic can be bridged/routed between the two devices.
The CO and CP devices are connected by a regular telephone line running xDSL signals, which carries
packets between these two devices with bit rates up to 4.6 Mbps (DSL LAN Extender 400) or 7.1 Mbps
(DSL LAN Extender 800/700). Even though the distance can be as long as 4 or 5 miles, this link is a
dedicated link between the two devices (DSL LAN Extender CO and DSL LAN Extender CP in this
case). To simplify the settings, there are not many parameters users need to configure and they don't
influence the system level functionality of routing or bridging. So, a way of looking at the pair of DSL
LAN Extenders is to treat it as a single bridge/router having two Ethernet ports. Each of the ports is
capable of doing link level bridging as well as routing for IP protocol.
Routing and Bridging Features
- Both CO and CP support bridging on Ethernet port
- Both CO and CP support RIP-1/RIP-2 protocol for IP packet routing
- Bridging and RIP routing can be enabled at the same time
Distinguished Features of each device:
- CP device supports Network Address Translation (NAT)
- CP device can serve as a Dynamic Host Configuration Protocol (DHCP) server
- CP device can serve as a router to the customer premises' LAN
- CO device supports Bandwidth Management of the link
Bridging, Router, RIP, and NAT
The following are the parameters in the device that users will need to configure to have the device
properly handle packets:
- Bridging Enabled
- Router Enabled
- RIP Enabled
- NAT Enabled
Another factor users might need to consider is the relationship between CO and CP. It may seem
complicated by just looking at these many combinations. But actually, it's not. Understanding the basic
description of those parameters will make the selection easy.
© 2002 Black Box Corporation
Page 33
Advertisement
Table of Contents
