H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 242)

29-2
Trace Route
By using the trace route command, you can display the Layer 3 devices involved in delivering a packet
from source to destination. This function is useful for identification of failed node(s) in the event of
network failure.
The trace route command involves the following steps in its execution:
1) The source device sends a packet with a TTL value of 1 to the destination device.
2) The first hop (the Layer 3 device that first receives the packet) responds by sending a TTL-expired
ICMP message to the source, with its IP address encapsulated. In this way, the source device can
get the address of the first Layer 3 device.
3) The source device sends a packet with a TTL value of 2 to the destination device.
4) The second hop responds with a TTL-expired ICMP message, which gives the source device the
address of the second Layer 3 device.
5) The above process continues until the ultimate destination device is reached. In this way, the
source device can trace the addresses of all the Layer 3 devices involved to get to the destination
device.
The traceroute command can be applied to the destination’s host name or IP address. If the
destination’s host name is unknown, the prompt information is displayed.
Diagnostic Tool Operations
Ping Operation
Support for the IPv6 ping operations depends on the device model. Refer to Compatibility Matrixes for
details.
IPv4 ping operation
Select Diagnostic Tools > Ping from the navigation tree to enter the IPv4 Ping configuration page.
Then click Display Advanced Config to display the configurations of the advanced parameters of IPv4
ping operation, as shown in Figure 29-1 .