3Com 5500 SI - Switch - Stackable, Configuration Manual

Page: 307 / 686

IP Performance Configuration 307
Troubleshooting IP
Performance
Fault: IP layer protocol works normally but TCP and UDP cannot work normally.
In the event of such a fault, you can enable the corresponding debugging information
output to view the debugging information.
■
Use the
terminal debugging
command to output the debugging information to
the console.
■
Use the command
debugging udp packet
to enable the UDP debugging to trace
the UDP packet.
The following are the UDP packet formats:
UDP output packet:
Source IP address:202.38.160.1
Source port:1024
Destination IP Address 202.38.160.1
Destination port: 4296
■
Use the
debugging tcp packet
command to enable the TCP debugging to trace
the TCP packets.
Operations include:
[SW5500] terminal debugging
<SW5500> debugging tcp packet
Then the TCP packets received or sent can be checked in real time. Specific packet
formats include:
TCP output packet:
Source IP address:202.38.160.1
Source port:1024
Destination IP Address 202.38.160.1
Destination port: 4296
Sequence number :4185089
Ack number: 0
Flag :SYN
Packet length :60
Data offset: 10
Display the total number of FIB entries
display fib statistics [{ begin | include
| exclude } text ]
Reset IP statistics information
reset ip statistics
Reset TCP statistics information
reset tcp statistics
Reset UDP statistics information
reset udp statistics
Table 305 Displaying and Debugging IP Performance
Operation Command