mac
Commands for Network Port Configuration
110
Parameter: <interface-list>: Port ID
Command Mode: Admin Mode.
Default Settings: No link test.
Usage Guide: The RJ-45 port connected with the twisted pair under test should be in
accordance with the wiring sequence rules of IEEE802.3, or the wire pairs in the test
result may not be the actual ones. On a 100M port, only two pairs are used: (1, 2) and (3,
6), whose results are the only effective ones. If a 1000M port is connected to a 100M port,
the results of (4, 5) and (7, 8) will be of no meaning. The result may have deviations
according to the type of the twisted pair, the temperature, working voltage and other
conditions. When the temperature is 20 degree Celsius, and the voltage is stable without
interference, and the length of the twisted pair is not longer than 100 meters, a deviation
of +/-2 meters is allowed. When the port is at Link UP status, a deviation of +/-10 meters
is allowed. Notice: the test procedure will block all data flow on the line for 5-10 seconds,
and then restore the original status.
Notice: combo port supports VCT function detection only at copper cable port mode,
100M port does not diagnose the link length at Link UP status.
568A wiring sequence: (1 green white, 2 green), (3 orange white, 6 orange), (4 blue, 5
blue white), (7 brown white, 8 brown).
568B wiring sequence: (1 orange white, 2 orange), (3 green white, 6 green), (4 blue, 5
blue white), (7 brown white, 8 brown).
Example: Test the link status of the twisted pair connected to the 1000M port 1/25.
Switch#virtual-cable-test interface ethernet 1/25
Interface Ethernet1/25:
--------------------------------------------------------------------------
Cable pairs Cable status Error length (meters)
--------------- ----------------- --------------------------
(1, 2) open 5
(3, 6) open 5
(4, 5) open 5
(7, 8) short 5
3.1.21 switchport flood-control
Command: switchport flood-control { bcast|mcast|ucast }
no switchport flood-control { bcast|mcast|ucast }
Function: Configure that switch does not transmit broadcast, unknown multicast or
unknown unicast packets any more to the specified port; no command restores the
default configuration.
Parameter: bcast: prevents that broadcast packets can not be transmitted to the