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2509 Router

The Cisco 2509 Router is a Terminal Access Router.  It has 1-8 port Async port (provides connection to other devices on the network), 1 Ethernet AUI port, 2 Serial ports, Console port and Aux port.


Support Documentation


Cisco 2500 Multiport Installation and Configuration Guide

Overview of the Router

Preparing to Install the Router

Installing the Router

Configuring the Router


Maintaining the Router



Cisco 2509, 2510, 2511, and 2512


Overview of the Cisco 2500 Series Access Server

Preparing for Installation

Installing the Cisco 2500 Series Access Server

Configuring the Cisco 2500 Series Access Server

Internetworking Primer

Cisco 2500 Series Access Server Maintenance

Cable Specifications


Cisco IOS Release 12.0 Security Configuration Guide

Using Cisco IOS Software

Part 1: Authentication, Authorization, and Accounting (AAA)

Part 2: Security Server Protocols

Part 3: Traffic Filtering and Firewalls

Part 4: IP Security and Encryption

Part 5: Other Security Features

Part 6: Appendixes



Cisco 2500 Router Hardware Troubleshooting

"%Error opening tftp:// config" Error Message Prevention

Troubleshooting Ethernet Collisions

Troubleshooting Memory Problems

Troubleshooting Router Crashes

Troubleshooting Router Hangs

Troubleshooting High CPU Utilization Due to Interrupts

Troubleshooting High CPU Utilization due to Processes

Troubleshooting High CPU Utilization in IP Input Process

Troubleshooting High CPU Utilization on Cisco Routers

Troubleshooting Input Queue Drops and Output Queue Drops

Troubleshooting Watchdog Timeouts


Access and Communication Servers Configuration Guide

Access and Comms Server Product Overview

Understanding the User Interface

Loading System Images and Config. Files

Configuring Terminal Sessions and Modem Support

Managing the System

Configuring Interfaces

Configuring Dial on Demand Routing

Configuring LAPB and X.25

Configuring Frame Relay

Configuring SMDS

Configuring Telnet

Configuring LAT

Configuring TN3270

Configuring AppleTalk Remote Access

Configuring SLIP and PPP

Configuring XRemote

Configuring AppleTalk Routing

Configuring IP

Configuring IP Routing

Configuring Novell IPX

Configuring Protocol Translation


Additional Information

Back up and Restore Configuration Files

Capturing Text Output from Hyperterminal

The show processes Command

How To Copy a System Image from One Device to Another

How to Verify Cisco Express Forwarding Switching

Problems Caused by Simultaneous Access to Router NVRAM

Prevent "Translating. domain server (" Messages after an Invalid Command is Entered on a Router

Standard Break Key Sequence Combinations During Password Recovery