4
6.
The source device thinks that:
{
The packet has reached the destination device after receiving the port-unreachable ICMP
message.
{
The path to the destination device is 1.1.1.2 to 1.1.2.2 to 1.1.3.2.
Prerequisites
Before you use a tracert command, perform the tasks in this section.
For an IPv4 network:
•
Enable sending of ICMP timeout packets on the intermediate devices (devices between the source
and destination devices). If the intermediate devices are H3C devices, execute the
ip ttl-expires
enable
command on the devices. For more information about this command, see
Layer 3—IP
Services Command Reference
.
•
Enable sending of ICMP destination unreachable packets on the destination device. If the
destination device is an H3C device, execute the
ip unreachables enable
command. For more
information about this command, see
Layer 3—IP Services Command Reference
.
For an IPv6 network:
•
Enable sending of ICMPv6 timeout packets on the intermediate devices (devices between the
source and destination devices). If the intermediate devices are H3C devices, execute the
ipv6
hoplimit-expires enable
command on the devices. For more information about this command, see
Layer 3—IP Services Command Reference
.
•
Enable sending of ICMPv6 destination unreachable packets on the destination device. If the
destination device is an H3C device, execute the
ipv6 unreachables enable
command. For more
information about this command, see
Layer 3—IP Services Command Reference
.
Using a tracert command to identify failed or all nodes in a
path
Execute
tracert
commands in any view.
Task Command
Display the routes from source to
destination.
•
For IPv4 networks:
tracert
[
-a
source-ip
|
-f
first-ttl
|
-m
max-ttl
|
-p
port
|
-q
packet-number
|
-t
tos
{
-topology
topo-name
|
-vpn-instance
vpn-instance-name
[
-resolve-as
{
global
|
none
|
vpn
} ] }
|
-w
timeout
] *
host
•
For IPv6 networks:
tracert ipv6
[
-f
first-hop
|
-m
max-hops
|
-p
port
|
-q
packet-number
|
-t
traffic-class
|
-vpn-instance
vpn-instance-name
[
-resolve-as
{
global
|
none
|
vpn
} ] |
-w
timeout
] *
host
For more information about the
tracert mpls
ipv4
command, see
MPLS Command Reference
.
