H3C S3100-52P Command Manual page 18

Command Manual – System Maintenance and Debugging
H3C S3100-52P Ethernet Switch
The executing procedure of the tracert command is as follows: First, the source sends
a packet with the TTL of 1, and the first hop device returns an ICMP error message
indicating that it cannot forward this packet because of TTL timeout. Then, the source
resends a packet with the TTL of 2, and the second hop device also returns an ICMP
TTL timeout message. This procedure goes on and on until a packet gets to the
destination or the maximum TTL is reached. During the procedure, the system records
the source address of each ICMP TTL timeout message in order to offer the path that
the packets pass through to the destination.
If you find that the network is in trouble by using the ping command, you can use the
tracert command to find where the trouble is in the network.
The tracert command can output the IP addresses of all the gateways the packets pass
through to the destination. It output the string "***" if a gateway times out.
Example
# Trace the gateways the packets pass through during its journey to the destination with
IP address 18.26.0.115.
<H3C> tracert 18.26.0.115
tracert to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
12 * * *
13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
14 * * *
15 * * *
16 * * *
17 * * *
18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
Chapter 2 Network Connectivity Test
2-4
Commands