Cisco CRS-1 - Carrier Routing System Router Getting Started Guide

9-3
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
Chapter 9 Troubleshooting the Cisco IOS XR Software
Basic Troubleshooting Commands
Using the ping Command
Use the ping command to diagnose network connectivity. Enter a hostname or an IP address as an
argument to this command.
The ping command sends an echo request packet to an address, then awaits a reply. Ping output can help
you evaluate path-to-host reliability, delays over the path, and whether the host can be reached or is
functioning.
Each exclamation point (!) indicates receipt of a reply. A period (.) indicates the network server timed
out while waiting for a reply. Other characters may appear in the ping output display, depending on the
protocol type.
Examples
In the following example, a successful ping attempt is shown:
RP/0/RP0/CPU0:router# ping 10.233.233.233
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.233.233.233, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/7 ms
In the following example, an unsuccessful ping attempt is shown:
RP/0/RP0/CPU0:router# ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Using the traceroute Command
Use the traceroute command to discover the routes that packets take when traveling to their destination.
Enter a hostname or an IP address as an argument to this command.
show tech-support Collects a large amount of system information for troubleshooting purposes. The
output should be provided to technical support representatives when a problem is
reported. Because of the impact it can have on a running system, it is reserved for
users assigned to the cisco-support task ID.
show tracebacks Allows you to get a dump of all the unsolicited debug messages that contained
traceback information (that is, a list of program counters back from the line of code
generating the message) along with the dynamic link library (DLL) information
necessary to decode the traceback.
show user [group | tasks | all] Displays the username for the current logged-in user. Use this command to also
display the groups and associated task IDs assigned to the account.
show version Displays basic system information.
Table 9-1 Common show Commands in Cisco IOS XR Software (continued)
Command Description

Cisco CRS-1 - Carrier Routing System Router Specifications

General

Brand	Cisco
Model	CRS-1 - Carrier Routing System Router
Category	Network Router
Language	English