3Com 4210 PWR - Configuring the Interval to Perform Statistical Analysis on Port Traffic

102 CHAPTER 9: PORT BASIC CONFIGURATION
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■ external: Performs external loop test. In the external loop test, self-loop
headers must be used on the port of the switch ( for 100M port, the self-loop
headers are made from four cores of the 8-core cables, for 1000M port, the
self-loop header are made from eight cores of the 8-core cables, then the
packets forwarded by the port will be received by itself.). The external loop test
can locate the hardware failures on the port.
■ internal: Performs internal loop test. In the internal loop test, self loop is
established in the switching chip to locate the chip failure which is related to
the port.
Note that:
■ After you use the shutdown command on a port, the port cannot run
loopback test.
■ You cannot use the speed, duplex, mdi and shutdown commands on the
ports running loopback test.
■ Some ports do not support loopback test, and corresponding prompts will be
given when you perform loopback test on them.
Enabling the System to
Test a Connected Cable
You can enable the system to test the cable connected to a specific port. The test
result will be returned in five seconds. The system can test these attributes of the
cable: Receive and transmit directions (RX and TX), short circuit/open circuit or not,
the length of the faulty cable.
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■ Currently, the device is only capable of testing the cable status and cable
length. For the testing items that are currently not supported, "-" is displayed in
the corresponding fields of the virtual-cable-test command.
■ Cable test cannot be performed on an optical port.
Configuring the
Interval to Perform
Statistical Analysis on
Port Traffic
By performing the following configuration, you can set the interval to perform
statistical analysis on the traffic of a port.
When you use the display interface interface-type interface-number command
to display the information of a port, the system performs statistical analysis on the
traffic flow passing through the port during the specified interval and displays the
average rates in the interval. For example, if you set this interval to 100 seconds,
the displayed information is as follows:
Last 100 seconds input: 0 packets/sec 0 bytes/sec
Last 100 seconds output: 0 packets/sec 0 bytes/sec
Tabl e 66 Enable the system to test connected cables
Operation Command Remarks
Enter system view system-view -
Enter Ethernet port view interface interface-type
interface-number
-
Enable the system to test
connected cables
virtual-cable-test Required