Chapter 1: Overview; System Description - Enterasys X-Pedition XSR-1805 Getting Started Manual

1
Overview
This chapter introduces key features of the XSR-1805 and briefly describes hardware installation.

System Description

The XSR is a networking device designed for enterprise branch offices that provides IP routing
over FastEthernet LAN and T1/E1, Serial (RS232, X.21, V.35, RS422/530, RS449), Dial Services via
POTS, ISDN (BRI, PRI), or Frame Relay WAN connections. Virtual Private Network (VPN) and
Firewall support is also provided in Site-to-Site or Remote Access applications.
The router can be managed using the Command Line Interface (CLI) and monitored using SNMP
v1, v2c/v3 (with standard MIB-II and proprietary MIB support). The XSR also provides Web
access to display device data. A typical XSR deployment might be in two branch offices linked to a
regional office, as illustrated in Figure 1-1. In this example, one XSR with its associated sub-
network has an T1/E1 or high-speed serial WAN link as its primary link to the Public Service
Telephone Network (PSTN) with an asynchronous modem link as backup.
Typical XSR-1805 Topology
Figure 1-1
Regional site backup:
XSR-1805
modem pool
(3rd party RAS)
PSTN (for PPP)
Network
Authenticate incoming
PSTN
PPP connection with
local authentication database
Primary link:
T1/E1 or serial interface
running PPP
Link backup
with PPP
via external
async modem
XSR-1805 XSR-1805
IP subnet IP subnet
XSR Getting Started Guide 1-1