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Applying Cisco Troubleshooting Tools

  • Sample Chapter is provided courtesy of Cisco Press.
  • Date: Nov 16, 2001.

Chapter Description

This sample chapter from CCNP Support Exam Certification Guide introduces some powerful troubleshooting tools that are built into the Cisco IOS. As with other tools, it is important that you identify when to use them and what information they reveal. Because some of these tools have an impact on the way routers operate and may impede the routers' utmost performance, it is essential to use them with care. To better understand the output of these commands, and to recognize what router internal operations they affect, this chapter discusses router internal components and operations. As each tool/command is introduced, its usefulness is described and tips are given on how to use it effectively.

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show controllers cxbus Command

The show controllers cxbus exec command is used on the Cisco 7x00 series routers to display information about the SP, the CxBus controller, and the contents and microcode of cards attached to the bus. This command's output for the most part is useful for diagnostic tasks performed by Cisco support engineers only. Example 4-11 is a sample output of the show controllers cxbus command executed on a Cisco 7000 router.

Example 4-11 A Sample Output of the show controllers cxbus Command

Router# show controllers cxbus

Switch Processor 5, hardware version 11.1, microcode version 172.6

Microcode loaded from system

512 Kbytes of main memory, 128 Kbytes cache memory

75 1520 byte buffers, 86 4484 byte buffers

Restarts: 0 line down, 0 hung output, 0 controller error

CIP 3, hardware version 1.1, microcode version 170.1

Microcode loaded from system

CPU utilization 7%, sram 145600/512K, dram 86688/2M

Interface 24 - Channel 3/0

43 buffer RX queue threshold, 61 buffer TX queue limit, buffer size 4484

ift 0007, rql 32, tq 0000 0468, tql 61

Transmitter delay is 0 microseconds

Interface 25 - Channel 3/1

43 buffer RX queue threshold, 61 buffer TX queue limit, buffer size 4484

ift 0007, rql 34, tq 0000 0000, tql 61

Transmitter delay is 0 microseconds

.

.

.


The top portion of the output displayed by Example 4-11 tells you the SP's hardware and microcode version, main memory and cache memory size, number of different buffer sizes, and the number of restarts due to line down (communication line), hung output, or controller error. The second part of the output displayed by Example 4-11 includes information about the Channel Interface Processor (CIP). In this section, you can see the CIP's hardware and microcode version, CPU utilization, free and total SRAM memory (Static RAM is a high speed memory used for operational code), free and total DRAM memory (Dynamic RAM is normal memory used for packets, data,and so on), and information about each of the CIP interfaces.

14. show stacks Command | Next Section Previous Section

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