Using Layer 2 Traceroute; Understanding Layer 2 Traceroute - Cisco Catalyst 2960 Software Configuration Manual

Chapter 39 Troubleshooting
Though other protocol keywords are available with the ping command, they are not supported in this
Note
release.
This example shows how to ping an IP host:
Switch# ping 172.20.52.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echoes to 172.20.52.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
Switch#
Table 39-1
Table 39-1
Character
!
.
U
C
I
?
&
To end a ping session, enter the escape sequence (Ctrl-^ X by default). Simultaneously press and release
the Ctrl, Shift, and 6 keys and then press the X key.

Using Layer 2 Traceroute

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•
•

Understanding 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. It finds the path by using the MAC address tables of the switches in the path. When the
switch detects a device in the path that does not support Layer 2 traceroute, the switch continues to send
Layer 2 trace queries and lets them time out.
The switch 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.
OL-26520-01
describes the possible ping character output.
Ping Output Display Characters
Description
Each exclamation point means receipt of a reply.
Each period means the network server timed out while waiting for a reply.
A destination unreachable error PDU was received.
A congestion experienced packet was received.
User interrupted test.
Unknown packet type.
Packet lifetime exceeded.
Understanding Layer 2 Traceroute, page 39-15
Usage Guidelines, page 39-16
Displaying the Physical Path, page 39-17
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
Using Layer 2 Traceroute
39-15