HP 5500 EI Series Configuration Manual page 18

2. Use the tracert command to identify failed nodes:
# Enable sending of ICMP timeout packets on Device B.
<DeviceB> system-view
[DeviceB] ip ttl-expires enable
# Enable sending of ICMP destination unreachable packets on Device C.
<DeviceC> system-view
[DeviceC] ip unreachables enable
# Execute the tracert command on Device A.
<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 break
1 1.1.1.2 14 ms 10 ms 20 ms
2 * * *
3 * * *
4 * * *
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<DeviceA>
The output shows that Device A and Device C cannot reach other, Device A and Device B can
reach each other, and an error has occurred on the connection between Device B and Device C.
3. Use the debugging ip icmp command on Device A and Device C to verify that they can send and
receive the specific ICMP packets, or use the display ip routing-table command to verify the
availability of active routes between Device A and Device C.
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