TRENDnet TI-G160WS, Руководство пользователя, Страница: 29 / 148

© Copyright 2019 TRENDnet. All Rights Reserved.
TRENDnet User’s Guide
Industrial Managed Switch Series
26
MAC Management
Dynamic Address:
The MAC addresses are learnt by the switch. When the switch receives frames, it will
record the source MAC, the received port and the VLAN in the address table with an age
time. When the age time is expired, the address entry will be removed from the address
table.
Static Address:
The MAC addresses are configured by users. The static addresses will not be aged out by
the switch; it can be removed by user only. The maximum static address entry is up to
256.
The MAC Table (a MAC table is also known as a filtering database) shows how frames are
forwarded or filtered across the Switch’s ports. When a device (which may belong to a
VLAN group) sends a packet which is forwarded to a port on the Switch, the MAC address
of the device is shown on the Switch’s MAC Table. It also shows whether the MAC address
is dynamic (learned by the Switch) or static (manually entered).
The Switch uses the MAC Table to determine how to forward frames. See the following
figure.
1. The Switch examines the received frame and learns the port from which this
source MAC address came.
2. The Switch checks to see if the frame's destination MAC address matches a
source MAC address already learnt in the MAC Table.

If the Switch has already learnt the port for this MAC address, then it
forwards the frame to that port.

If the Switch has not already learnt the port for this MAC address, then
the frame is flooded to all ports. If too much port flooding, it may lead
to network congestion.

If the Switch has already learnt the port for this MAC address, but the
destination port is the same as the port it came in on, then it filters the
frame.
Figure MAC Table Flowchart
Default Settings
The default MAC address table age time is 300 seconds.
The Maximum static address entry
is 256.
Static MAC Settings
CLI Configuration
Node Command Description
enable show mac-address-
table aging-time This command displays the current MAC
address table age time.
enable show mac-address-
table (static|dynamic) This command displays the current
static/dynamic unicast address entries.
enable show mac-address-
table mac MACADDR This command displays information of a
specific MAC.
enable show mac-address-
table port PORT_ID This command displays the current unicast
address entries learnt by the specific port.
configure mac-address-table
static MACADDR vlan
VLANID port PORT_ID This command configures a static unicast
entry.
configure no mac-address-table This command removes a static unicast entry