3troubleshootingjunos

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Course Introduction

This chapter does not contain any review questions.

TroubleshootingReproductionTool Kit for JUNOS Platforms

Overview of JUNOS Platforms

1.

To safely power off an M Series router, you must perform a graceful shu d wn f JUNOS Software before removing power. Use the request system reboot ommand, which causes the device to reboot.

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The RE is the brains of the platform; it is responsible for performing routing updates and system management. The RE runs various protocol and management software processes inside a protected memory environment. The PFE is responsible for forwarding transit packets through the router using an ASIC-based switching path.

3.

The Craft Interface is the collection of mechanisms n some JUNOS platforms that allow you to

4.

Interface name at-0/1/1.100 references a logical unit 100 of the ATM interface in FPC 0, PIC 1, and port 1.

forBecause m dern communications networks are complex, troubleshooting them can be challenging. To alleviate this challenge, we recommend a layered troubleshooting approach. Such an approach utilizes the OSI model to identify prospective problems, isolate the likely causes of those problems, and then systematically eliminate each potential cause. By conducting tests that accurately isolate a symptom to the root-cause layer, you avoid wasting time testing layers that are not at fault.

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The three ways in which the CLI can help to perform fault analysis are: (1) deployment of key commands; (2) process restart and bringing hardware online and offline; and (3) deployment of network and diagnostic utilities.

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4.

You use the monitor interface interface-name command to display real-time statistics about a physical interface. The output updates every second. The output of this command also shows the amount that each field changes from the time you start the command or from the time you clear the counters by using the c key.

JTAC Processes, Guidelines, and Support Resources

1.

You need a chassis serial number when opening a case. The serial number w ll help JTAC staff to determine the support status.

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When you access the CSC, you have a wealth of technical s pport information in the form of the JTAC Knowledge Base, the PR database, technical b lletins, and white papers that provide configuration examples and technology primers.