3Com 4210G Series Configuration Manual page 979

Figure 21-4 Ping and tracert network diagram
Configuration procedure
# Use the ping command to display whether an available route exists between Device A and Device C.
<DeviceA> ping 1.1.2.2
PING 1.1.2.2: 56 data bytes, press CTRL_C to break
Request time out
Request time out
Request time out
Request time out
Request time out
--- 1.1.2.2 ping statistics ---
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
# No such a route exists. Use the tracert command to determine failed nodes.
<DeviceA> system-view
[DeviceA] ip ttl-expires enable
[DeviceA] ip unreachables enable
[DeviceA] tracert 1.1.2.2
traceroute to 1.1.2.2(1.1.2.2) 30 hops max,40 bytes packet, press CTRL_C to bre
ak
1 1.1.1.2 14 ms 10 ms 20 ms
2 * * *
3 * * *
4 * * *
5
<DeviceA>
The above output shows that no available route exists between Device A and Device C; an available
router exists between Device A and Device B; an error occurred on the connection between Device B
and Device C. In this case, you can use the debugging ip icmp command to enable ICMP debugging
on Device A and Device C to check whether the devices send or receive the specified ICMP packets,
or you can use the display ip routing-table command to display whether a route exists between the
two devices.
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