Chapter 1 General Troubleshooting; User Access Privileges; Cli Access Through A Console Port; Cli Access Through A Terminal Server - Cisco CRS-1 - Carrier Routing System Router Troubleshooting Manual

Chapter 1 General Troubleshooting
If a prompt appears, indicating that the command-line interface (CLI) is accessible, but your login
username and password are invalid, you are prevented from accessing the router. Verify that you have
the correct username and password. If you have the correct username and password, but are locked out
of the router, you may need to perform password recovery to access the system again. See Cisco IOS XR
Getting Started Guide for the Cisco CRS-1 Router for password recovery procedures.

User Access Privileges

When logging on to the router, use a username that is associated with a valid user group that has the
authorization to execute the required commands.
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See Cisco IOS XR System Security Command Reference for the Cisco CRS-1 Router and Cisco IOS XR
System Security Configuration Guide for the Cisco CRS-1 Router for information on users, usernames,
and user groups.

CLI Access Through a Console Port

The first time a router is started, you must use a direct connection to the Console port to connect to the
router and enter the initial configuration. See Cisco IOS XR Getting Started Guide for the Cisco CRS-1
Router for information on connecting to the router through a console port. When you use a direct
connection to the Console port, CLI commands are entered at a terminal or at a computer running
terminal emulation software. A direct Console port connection is useful for entering initial
configurations and performing some debugging tasks.

CLI Access Through a Terminal Server

A terminal server connection provides a way to access the Console port from a remote location. A
terminal server connection is used when you need to perform tasks that require Console port access from
a remote location.
Connecting to a router through a terminal server is similar to directly connecting through the Console
port. For both connection types, the physical connection takes place through the Console port. The
difference is that the terminal server connects directly to the Console port, and you must use a Telnet
session to establish communications through the terminal server to the router.
If you are unable to access the CLI through a terminal server, perform the following procedure.
SUMMARY STEPS
1.
2.
3.
4.
OL-21483-02
If you are troubleshooting all Secure Domain Routers (SDRs), the username must be associated with
the root-system user group.
If you are troubleshooting a single SDR, the username must be associated with the root-lr user
group.
Disable flow control (XON/XOFF) on the Terminal Server.
Disable local echo mode on the Terminal Server.
Verify the router name configured using the hostname command.
Check whether the port address is configured correctly.
Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
Verifying and Troubleshooting CLI Access
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