Cisco Gigabit Ethernet Switch Module for HP p-Class BladeSystem Software Configuration Guide

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Chapter 29 Troubleshooting

Using Layer 2 Traceroute

Table 29-1 describes the possible ping character output.

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, page 29-14

• Usage Guidelines, page 29-15

• Displaying the Physical Path, page 29-16

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.

Table 29-1 Ping Output Display Characters

Character Description

! Each exclamation point means receipt of a reply.

. Each period means the network server timed out while waiting for a reply.

U A destination unreachable error PDU was received.

C A congestion experienced packet was received.

I User interrupted test.

? Unknown packet type.

& Packet lifetime exceeded.