Ping; Layer 2 Traceroute; Layer 2 Traceroute Guidelines - Cisco Catalyst 9500 Manual

Ping

Note
Note
Follow the steps described in the section
from a lost or forgotten password.
Ping
The device supports IP ping, which you can use to test connectivity to remote hosts. Ping sends an echo request
packet to an address and waits for a reply. Ping returns one of these responses:
• Normal response—The normal response (hostname is alive) occurs in 1 to 10 seconds, depending on
• Destination does not respond—If the host does not respond, a no-answer message is returned.
• Unknown host—If the host does not exist, an unknown host message is returned.
• Destination unreachable—If the default gateway cannot reach the specified network, a
• Network or host unreachable—If there is no entry in the route table for the host or network, a network
Refere the section

Layer 2 Traceroute

The Layer 2 traceroute feature allows the switch to identify the physical path that a packet takes from a source
device to a destination device. Layer 2 traceroute supports only unicast source and destination MAC addresses.
Traceroute finds the path by using the MAC address tables of the devices in the path. When the Device detects
a device in the path that does not support Layer 2 traceroute, the Device continues to send Layer 2 trace queries
and lets them time out.
The Device can only identify the path from the source device to the destination device. It cannot identify the
path that a packet takes from source host to the source device or from the destination device to the destination
host.

Layer 2 Traceroute Guidelines

• Cisco Discovery Protocol (CDP) must be enabled on all the devices in the network. For Layer 2 traceroute
System Management Configuration Guide, Cisco IOS XE Amsterdam 17.2.x (Catalyst 9500 Switches)
316
On these devices, a system administrator can disable some of the functionality of this feature by allowing an
end user to reset a password only by agreeing to return to the default configuration. If you are an end user
trying to reset a password when password recovery has been disabled, a status message reminds you to return
to the default configuration during the recovery process.
You cannot recover encryption password key, when Cisco WLC configuration is copied from one Cisco WLC
to another (in case of an RMA).
network traffic.
destination-unreachable message is returned.
or host unreachable message is returned.
Executing Ping, on page 332
to function properly, do not disable CDP.
Recovering from a Lost or Forgotten Password, on page 326
to understand how ping works.
Troubleshooting the Software Configuration
to recover