Using Layer 2 Traceroute; Understanding Layer 2 Traceroute; Usage Guidelines - Cisco WS-CBS3032-DEL Software Configuration Manual

Using Layer 2 Traceroute

Table 48-1
Table 48-1
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
These sections contain this information:
•
•
•

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.

Usage Guidelines

These are the Layer 2 traceroute usage guidelines:
•
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
48-12
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 48-12
Usage Guidelines, page 48-12
Displaying the Physical Path, page 48-13
Cisco Discovery Protocol (CDP) must be enabled on all the devices in the network. For Layer 2
traceroute to function properly, do not disable CDP.
For a list of switches that support Layer 2 traceroute, see the
page 48-12. If any devices in the physical path are transparent to CDP, the switch cannot identify
the path through these devices. For more information about enabling CDP, see
"Configuring CDP."
Chapter 48 Troubleshooting
"Usage Guidelines" section on
Chapter 27,
OL-13270-06