Debug Filters; Ping And Traceroute; Using Ping - Cisco Nexus 9000 Series Troubleshooting Manual

Debug Filters

access to the device by generating too many messages to the console or creating CPU-intensive events that
could seriously affect network performance.
We recommend that you open a second Telnet or SSH session before you enter any debug commands. If
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the debug session overwhelms the current output window, you can use the second session to enter the
undebug all command to stop the debug message output.
Debug Filters
You can filter out unwanted debug information by using the debug-filter command. The debug-filter command
allows you to limit the debug information produced by related debug commands.
The following example limits EIGRP hello packet debug information to Ethernet interface 2/1:
switch# debug-filter ip eigrp interface ethernet 2/1
switch# debug eigrp packets hello

Ping and Traceroute

Use the ping and traceroute features to troubleshoot problems with connectivity and path choices. Do not
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use these features to identify or resolve network performance issues.
The ping and traceroute commands are two of the most useful tools for troubleshooting TCP/IP networking
problems. The ping utility generates a series of echo packets to a destination across a TCP/IP internetwork.
When the echo packets arrive at the destination, they are rerouted and sent back to the source.
The traceroute utility operates in a similar fashion but can also determine the specific path that a frame takes
to its destination on a hop-by-hop basis.

Using Ping

Use the ping command to verify connectivity and latency to a particular destination across an IPv4 routed
network.
Use the ping6 command to verify connectivity and latency to a particular destination across an IPv6 routed
network.
The ping utility allows you to send a short message to a port or end device. By specifying the IPv4 or IPv6
address, you can send a series of frames to a target destination. Once these frames reach the target, they are
looped back to the source and a time stamp is taken.
We do not recommend using the Ping utility to test network performance with the IP address configured
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on the system.
Cisco Nexus 9000 Series NX-OS Troubleshooting Guide, Release 7.x
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Troubleshooting Tools and Methodology