H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 68)

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The above output shows that no available route exists between AC and Device B; an available router
exists between AC and Device A; an error occurred on the connection between Device A and Device B.
In this case, you can use the debugging ip icmp command to enable ICMP debugging on AC and
Device B 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.