D-Link DGS-3700-12, Руководство пользователя

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DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet User Manual
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Local Loopback Ports Settings
The Local Loopback Ports Settings are used to start or stop the internal loopback test on selected ports, or to set or
recover external loopback mode. When internal loopback is enabled, the device starts to send test packets to the port,
and keeps monitoring the packets received. When internal loopback is disabled, the loopback test is terminated and
the result is displayed. A port can only operate in one loopback mode at a time. When external loopback is enabled,
the MAC/PHY is set to external loopback mode. When external loopback is disabled, the MAC/PHY resumes normal
operation.
To view this window, click L2 Features > Local Loopback Ports Settings , as shown below:
Figure 4- 86 Local Loopback Ports Settings window
The following parameters may be configured:
Parameter Description
From Port /To Port Select a port or group of ports to Enable or Disable the Local Loopback Ports Settings using
the pull-down menus.
Loopback Mode
This function allows the user to select MAC Internal/MAC External or PHY Internal/PHY
External. MAC and PHY represent the layer on which the loopback is performed while the
Internal or External represents the local loopback mode.
State Select Enable to start internal loopback test; for external loopback, set port(s) to external
loopback mode. Select Disable to stop internal loopback test; for external loopback, recover
port(s) from external loopback mode.
Click Apply to implement changes.
LLDP
The Link Layer Discovery Protocol (LLDP) allows stations attached to an IEEE 802 LAN to advertise, to other stations
attached to the same IEEE 802 LAN. The major capabilities provided by this system is that it incorporates the station,
the management address or addresses of the entity or entities that provide management of those capabilities, and the
identification of the station’s point of attachment to the IEEE 802 LAN required by those management entity or entities.
The information distributed via this protocol is stored by its recipients in a standard Management Information Base
(MIB), making it possible for the information to be accessed by a Network Management System (NMS) through a
management protocol such as the Simple Network Management Protocol (SNMP).
LLDP
The LLDP section includes LLDP Global Settings, LLDP Port Settings, LLDP Management Address List, LLDP Basic
TLVs Settings, LLDP Dot1 TLVs Settings, LLDP Dot3 TLVs Settings, LLDP Statistics System, LLDP Local Port
Information, and LLDP Remote Port Information.