Cisco 1600 Series Routers Troubleshooting TechNotes - Cisco Systems

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Basic Concepts and Maintenance
- "%Error opening tftp://255.255.255.255/network config" Error Message Prevention
  03/Aug/2006
- Back up and Restore Configuration Files
  03/Aug/2006
- Buffer Tuning for all Cisco Routers
  28/Nov/2008
- Capturing Text Output from Hyperterminal
  25/Jun/2008
- Characterizing and Tracing Packet Floods Using Cisco Routers
  27/May/2005
- Cisco Cable Product Numbers, Part Numbers, and Descriptions
  01/Aug/2006
- Dealing with mallocfail and High CPU Utilization Resulting From the "Code Red" Worm
  20/Jun/2008
- Defining Strategies to Protect Against TCP SYN Denial of Service Attacks
  06/Jan/2006
- How to Protect Your Network Against the Nimda Virus
  06/Mar/2008
- How to Upgrade from ROMmon Using the Boot Image
  27/Jan/2006
- Maximum Number of Interfaces and Subinterfaces for Cisco IOS Routers: IDB Limits
  24/May/2012
- PCMCIA Filesystem Compatibility Matrix and Filesystem Information
  17/Feb/2009
- Performance Tuning Basics
  11/Jul/2007
- Prevent "Translating. domain server (255.255.255.255)" Messages after an Invalid Command is Entered on a Router
  02/Aug/2006
- Reset a Cisco Router to Factory Default Settings
  02/Aug/2006
- TCP and UDP Small Servers
  01/Aug/2006
- Understanding the Definition of bits per second (bits/sec) from the show interfaces Command Output
  01/Aug/2006
- Understanding the Ping and Traceroute Commands
  29/Nov/2006
- Use of the Configuration Register on All Cisco Routers
  03/Apr/2006
Boot Failure Recovery and IOS Upgrade
- How to Choose a Cisco IOS Software Release
  26/Mar/2010
- How To Copy a System Image from One Device to Another
  02/Aug/2006
- ROMmon Recovery for the Cisco 1600 Series Router
  23/Jan/2008
- Standard Break Key Sequence Combinations During Password Recovery
  02/Aug/2006
- TFTP Server Selection and Use
  02/Feb/2006
- Why Does My Router Lose Its Configuration During Reboot?
  25/Jun/2008
- Xmodem Console Download Procedure Using ROMmon
  01/Feb/2006
Cables and Specifications
- Auxiliary Port, Console Port, And Adapter Pinouts For Cisco 1000, 1600, 2500, 2600, And 3600 Series Routers
  27/Jan/2006
- CAB-X21 MT and CAB-X21 FC Serial Cable Specifications
  21/Nov/2006
- CAB-530 MT Serial Cable Specifications
  27/Jan/2006
- CAB-449 MT and CAB-449 FC EIA/TIA-449 Serial Cable Specifications
  30/Jan/2006
- CAB-232 MT and CAB-232 FC EIA/TIA-232 Serial Cable Specifications
  30/Jan/2006
- CAB-25AS-FDTE Adapter Technical Specifications
  30/Jan/2006
- CAB-25AS-MMOD Adapter Technical Specifications
  27/Jan/2006
- Cabling Guide for Console and AUX Ports
  03/Sep/2006
- Cisco 1605-R Dual Ethernet/WAN Interface Card Slot Router Cable Specifications
  07/Jul/2005
- Cisco 1604-R Ethernet/ISDN-BRI Modular Router Cable Specifications
  07/Jul/2005
- Cisco 1603-R Ethernet/ISDN-BRI Modular Router Cable Specifications
  07/Jul/2005
- Cisco 1602-R Ethernet/Serial Modular Router Cable Specifications
  07/Jul/2005
- Cisco 1601-R Router Cable Specifications
  07/Jul/2005
- Ethernet AUI Port, Pinouts, and Cable Specifications
  30/Jan/2006
- Ethernet 100BaseTX and 10BaseT Cables: Guidelines and Specifications
  01/Aug/2006
- How to Connect a KG-84A to a Cisco Serial Interface
  01/Aug/2006
- Serial Cable Connection Guide
  01/Aug/2006
- WIC-1B-S/T and WIC-1B-U Cable Specifications
  07/Jul/2005
- WIC-1DSU-T1 Cable Specifications
  07/Jul/2005
- WIC-1DSU-56K4 Cable Specifications
  07/Jul/2005
- WIC-1T One-Port Serial WAN Interface Card Cable Specifications
  07/Jul/2005
- 5-in-1 EIA/TIA-449 Assembly and Pinouts
  01/Aug/2006
- 5-in-1 EIA/TIA-232 Assembly and Pinouts
  04/Mar/2008
- 5-in-1 V.35 Assembly and Pinouts
  18/Dec/2007
- 5-in-1 X.21 Assembly and Pinouts
  04/Mar/2008
High CPU Utilization
- High CPU Utilization in Exec and Virtual Exec Processes
  12/Dec/2008
- The show processes Command
  06/Mar/2009
- Troubleshooting High CPU Utilization Due to Interrupts
  29/May/2008
- Troubleshooting High CPU Utilization due to Processes
  29/Sep/2008
- Troubleshooting High CPU Utilization in IP Input Process
  02/Aug/2006
- Troubleshooting High CPU Utilization on Cisco Routers
  24/Jul/2008
- What Causes %SYS-3-CPUHOG Messages?
  24/Jun/2008
Network Cards and Modules
- Understanding Analog Modem Network Modules (NM-8AM / NM-16AM)
  04/Feb/2010
- Understanding Digital Modem Network Modules on Cisco 3600 and 3700 Series Routers
  21/Jun/2005
- Understanding the 4-Port Sync Serial Network Module (NM-4T)
  04/Feb/2010
- Understanding the 1-Port ISDN BRI (S/T) WAN Interface Card (WIC-1B-S/T or WIC36-1B-S/T)
  11/Jul/2007
- Understanding the 1-Port ISDN BRI (U) WAN Interface Card (WIC-1B-U-V2, WIC-1B-U or WIC36-1B-U)
  29/Jan/2008
- Understanding the 1-Port ISDN BRI S/T Leased Line WIC (WIC-1B-S/T-LL)
  29/Jan/2008
- Understanding the 1-Port T1 CSU/DSU WAN Interface Card (WIC-1DSU-T1)
  17/Jan/2007
- Understanding the 1-Port 4-Wire 56/64 Kpbs CSU/DSU WAN Interface Card (WIC-1DSU-56K4)
  19/Nov/2007
- Understanding 16- and 32-Port Async Network Modules
  25/Jan/2008
- Understanding 4- and 8-Port ISDN BRI Network Modules
  06/Mar/2008
- Understanding 4-Port and 8-Port Async/Sync Network Modules
  29/Jan/2008
- Understanding 2-Port Serial WAN Interface Card (WIC-2T)
  05/May/2006
- Use WIC-1DSU-T1 Interface Cards on Cisco 1600, 1700, 2600, 3600 and 3700 Series Routers
  05/Oct/2006
- Using WIC-1DSU-56K4 Interface Cards on Cisco 1600, 1700, 2600 and 3600 Routers
  05/Jul/2006
- 2-Port Async/Sync WAN Interface Card (WIC-2A/S)
  04/Feb/2010
Troubleshooting Hardware
- Hardware Troubleshooting Index Page
  20/Oct/2006
- Processor Memory Parity Errors (PMPEs)
  31/Jan/2006
- SegV Exceptions
  31/Jul/2006
- Troubleshooting Buffer Leaks
  29/Nov/2006
- Troubleshooting Ethernet Collisions
  01/Aug/2006
- Troubleshooting Input Queue Drops and Output Queue Drops
  29/Jul/2008
- Troubleshooting Memory Problems
  28/Nov/2006
- Troubleshooting Spurious Accesses, Alignment Errors, and Spurious Interrupts
  02/Aug/2006
- Troubleshooting Watchdog Timeouts
  29/Nov/2006
- Understanding Software-forced Crashes
  31/Jul/2006
- 1600 Series Router Hardware Troubleshooting
  20/Jun/2008
Troubleshooting Router Hang and Router Crash
- Creating Core Dumps
  24/Jun/2008
- Less Common Types of System Crashes
  29/Nov/2006
- Retrieving Information from the Crashinfo File
  01/Feb/2006
- Troubleshooting Bus Error Crashes
  29/Nov/2006
- Troubleshooting Router Crashes
  28/Nov/2006
- Troubleshooting Router Hangs
  02/Aug/2006
- What Causes a Router To Be Restarted By the Abort or Trace Trap Commands
  29/Nov/2006
Miscellaneous
- Cisco 1600 Series Router Architecture
  22/Jan/2008
- Comparison of Cisco 1601-Cisco 1604 and Cisco 1605-R Memory Architectures
  07/Jul/2005
- High-Speed Serial Interface (HSSI) Design Specification
  18/Aug/2005
- How to Verify Cisco Express Forwarding Switching
  28/May/2007
- Problems Caused by Simultaneous Access to Router NVRAM
  03/Aug/2006
- Security Reference Information
  29/Jul/2003
- Software Installation and Upgrade Procedure for the 1600, 2000, 2500, 3000, AS5100, and AS5200
  24/Jun/2008
- Understanding and Configuring VLAN Routing and Bridging on a Router Using the IRB Feature
  31/Aug/2009
- WAN Interface Card (WIC) / Platform Hardware Compatibility Matrix for 1600, 1700, 2600, 3600 and 3700 Series Routers
  03/Mar/2008
- Software Upgrade Procedure
  08/Feb/2007

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