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Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
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Chapter 1 General Troubleshooting
Verifying and Troubleshooting CLI Access
• Have the output of the relevant show tech-support command captured and saved. The output from
the show tech-support command provides a traditional dump of the configuration and show
command outputs. For more commands used to collect system information, see Chapter 7,
“Collecting System Information.”
Documenting the Network
To be prepared to troubleshoot the network, maintain current documentation about the network,
including the following:
• An up-to-date internetwork map that outlines the physical location of all the devices on the network
and how they are connected, as well as a logical map of network addresses, network numbers,
subnetworks, and so on
• A list of all network protocols implemented in your network; and for each of the protocols
implemented, a list of the network numbers, subnetworks, zones, areas, and so on that are associated
with them
• For multishelf systems, note the Layer 2 connections used to provide router control plane Ethernet
network connectivity between racks (including the fabric card chassis [FCC])
• All points of contact to external networks
• The routing protocol for each external network connection
• The established baseline for your network, that is, the normal network behavior and performance at
different times of the day so that you can compare any problems with a baseline
• Which device is the spanningtree root bridge for the system control plane Ethernet network
Verifying and Troubleshooting CLI Access
Ensure that the system has been booted. If the system has not booted, see Cisco IOS XR Getting Started
Guide for the Cisco CRS-1 Router for information on booting a router running Cisco IOS XR software.
The following CLI access troubleshooting information is provided:
• General CLI Access Information, page 1-2
• User Access Privileges, page 1-3
• CLI Access Through a Console Port, page 1-3
• CLI Access Through a Terminal Server, page 1-3
• CLI Access Through the Management Ethernet Interface, page 1-4
General CLI Access Information
The following CLI access information applies to a console port, terminal server, and management
Ethernet interface connections.
Once the terminal emulation software is started and you press Enter, a router prompt should appear. If
no prompt appears, verify the physical connection to the console port and press Enter again. If the
prompt still does not appear, contact Cisco Technical Support. See the “Obtaining Documentation and
Submitting a Service Request” section on page viii in the Preface for Cisco Technical Support contact
information.
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