Cisco 1721 Troubleshooting Guide

Cisco 1721 - VPN Security Router Bundle Manual

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  • Cisco 1721 | Troubleshooting Guide - Page 1
    Modules and Cards DSP Optimization on the Cisco 1751 and Cisco 1760 Routers WIC-1ENET Module Identifying the Issue Troubleshooting ISDN Interfaces Troubleshooting Router Hangs Troubleshooting Bus Error Crashes Router Does Not Boot Router Crashes Watchdog Timeouts Router Is Dropping Packets Memory
  • Cisco 1721 | Troubleshooting Guide - Page 2
    with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it. Hardware-Software Compatibility and Memory Requirements Whenever you install a new card, module, or Cisco IOS® software image, it is important
  • Cisco 1721 | Troubleshooting Guide - Page 3
    interface card. The Cisco 1760 router includes two VIC-only slots. However, not all Cisco WAN Interface Cards (WICs), Voice Interface Cards (VICs), and Voice WAN Interface Cards (VWIC)s are supported by the 1700 Series Router. The documents below can help you verify that the module/card is supported
  • Cisco 1721 | Troubleshooting Guide - Page 4
    and the Cisco 1760 routers, based on the interface modules selected and their codec configurations. This tool supports Cisco IOS Software Releases 12.2(8) YN and later. WIC-1ENET Module The Cisco WIC-1ENET is a single-port Ethernet interface card supporting 10BASE-T Ethernet. The card provides the
  • Cisco 1721 | Troubleshooting Guide - Page 5
    processor tries to access a memory location that either does not exist (a software error) or does not respond properly (a hardware problem). A bus error can be identified by looking at the output of the show version command provided by the router (if not powercycled or manually reloaded). Here are
  • Cisco 1721 | Troubleshooting Guide - Page 6
    to communicate with the switch using hardware flow control. 2. Configure the baud rate and character format of the PC or terminal to match these console port default characteristics: 9600 baud, 8 data bits, 1 stop bit, No parity. LEDs are on after powering on the router, but there is nothing
  • Cisco 1721 | Troubleshooting Guide - Page 7
    Cisco - Hardware Troubleshooting for Cisco 1700 Series Routers Page 7 of 12 Router boots in ROMmon; no error messages on the console rommon 2 > reset If the router remains in ROMmon, follow the procedure described in ROMmon Recovery for the Cisco 1700 Series Router. Set the configuration register
  • Cisco 1721 | Troubleshooting Guide - Page 8
    SIMMs for upgrading the 1720, 1750, 1751, and 1760. Router boots in boot mode, with the following messages on the console: The Cisco IOS software image is not appropriate for the 1700 router, or it is corrupted. Erase the Flash and download a new valid Cisco IOS software image. loadprog: error
  • Cisco 1721 | Troubleshooting Guide - Page 9
    Dog Timeout *** Refer to Troubleshooting Watchdog Timeouts to further troubleshoot this issue. Router Is Dropping Packets Packet losses caused by hardware problems are fairly easy to identify. The following section uses the output of the show interfaces command to identify packet losses. Cyclic
  • Cisco 1721 | Troubleshooting Guide - Page 10
    Cisco - Hardware Troubleshooting for Cisco 1700 Series Routers Page 10 of 12 Consequently, the troubleshooting steps are simple. For example, if a router is connected to a switch, the troubleshooting steps would be: 1. Replace the cable. 2. If this does not solve the problem, try another port on
  • Cisco 1721 | Troubleshooting Guide - Page 11
    no output from some show commands You see "Low on memory" messages You see the console message "Unable to create EXEC - no memory or too many processes" The router hangs; there is no console response For more information regarding this issue, refer to Troubleshooting Memory Problems. Summary If you
  • Cisco 1721 | Troubleshooting Guide - Page 12
    -support command Related Information Cisco 1700 Series Routers Documentation ROMmon Recovery for the Cisco 1700 Series Router Image Naming Conventions Software Installation and Upgrade Procedures Capacity and Performance Management: Best Practices How to Choose a Cisco IOS Software Release - Memory
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Hardware Troubleshooting for Cisco
1700 Series Routers
Interactive
: This document offers customized analysis of your
Cisco device.
Contents
Introduction
Prerequisites
Requirements
Components Used
Hardware
-
Software Compatibility and Memory
Requirements
Error Messages
Conventions
Modules and
Cards
DSP
Optimization on the Cisco 1751 and Cisco 1760 Routers
WIC
-
1ENET
Module
Identifying the Issue
Troubleshooting
ISDN Interfaces
Troubleshooting Router Hangs
Troubleshooting Bus Error Crashes
Router Does
Not Boot
Router Crashes
Watchdog Timeouts
Router
Is Dropping Packets
Memory Leaks
Summary
Related Information
Introduction
Valuable time and resources are often wasted replacing hardware that actually functions properly. This
document helps troubleshoot potential hardware issues with Cisco 1700 Series Routers, and can help
you identify which component may be causing a hardware failure, depending on the type of error that
the router is experiencing.
Note:
This document does not cover any software-related failures except for those that are often
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Cisco - Hardware Troubleshooting for Cisco 1700 Series Routers
01/10/2004
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