H3C Technologies H3C SecBlade LB Cards - Manual (Page 16)

7
Ping and tracert example
Network requirements
As shown in Figure 4 , LB failed to Telnet Device B. Determine whether LB and Device B can reach each
other. If they cannot reach each other, locate the failed nodes in the network.
Figure 4 Network diagram
Configuration procedure
1. Use the ping command to test connectivity between LB and Device B.
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
The output shows that LB and Device B cannot reach each other.
2. Use the tracert command to identify failed nodes:
# Enable sending of ICMP timeout packets on Device A.
system-view
[DeviceA] ip ttl-expires enable
# Enable sending of ICMP destination unreachable packets on Device B.
system-view
[DeviceB] ip unreachables enable
# Execute the tracert command on LB.
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 * * *
5
The output shows that LB and Device B cannot reach other, LB and Device A can reach each other,
and an error occurred on the connection between Device A and Device B.