System Debugging - HP 6125XLG Configuration Manual

Figure 3 Network diagram
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Device A
Configuration procedure
1. Use the ping command to test connectivity between Device A and Device C.
<DeviceA> ping 1.1.2.2
PING 1.1.2.2(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,100.0% packet loss
The output shows that Device A and Device C cannot reach each other.
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 at most,40 bytes each packet, press CTRL_C to
break
1 1.1.1.2 14 ms 10 ms 20 ms
2 * * *
3 * * *
4 * * *
5
<DeviceA>
The output shows that Device A and Device C cannot reach each 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
connectivity between Device A and Device C.

System debugging

The device supports debugging for the majority of protocols and features and provides debugging
information to help users diagnose errors.
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Device B
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Device C
5