Advantech EKI-9512-C0IDW10E, Руководство пользователя

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EKI-9500 Series User Manual 156
The following table describes the items in the previous figure.
Dynamic Bindings
Use the DHCP Snooping Dynamic Bindings page to view and clear dynamic bindings
in the DHCP snooping bindings database. The DHCP snooping feature uses DHCP
messages to build and maintain the bindings database. The bindings database
includes data for clients only on untrusted ports. DHCP snooping creates a tentative
binding from DHCP DISCOVER and REQUEST messages. Tentative bindings tie a
client to an interface (the interface where the DHCP client message was received).
Tentative bindings are completed when DHCP snooping learns the client's IP
address from a DHCP ACK message on a trusted port. DHCP snooping removes
bindings in response to DECLINE, RELEASE, and NACK messages. The DHCP
snooping feature ignores the ACK messages as a reply to the DHCP Inform mes-
sages received on trusted ports.
To access this page, click Switching > DHCP Snooping > Base > Dynamic Bind-
ings .
Figure 4.161 Switching > DHCP Snooping > Base > Dynamic Bindings
The following table describes the items in the previous figure.
Persistent
Use the DHCP Snooping Persistent Configuration page to configure the persistent
location of the DHCP snooping bindings database. The bindings database can be
stored locally on the device or on a remote system somewhere else in the network.
The device must be able to reach the IP address of the remote system to send bind-
ings to a remote database.
Item Description
Interface The interface on which the DHCP client is authorized.
MAC Address The MAC address associated with the DHCP client. This is the Key to
the binding database.
VLAN ID The ID of the VLAN the client is authorized to use.
IP Address The IP address of the client.
Submit Click Submit to save the values.
Cancel Click Cancel to close the window.
Item Description
Interface The interface on which the DHCP client message was received.
MAC Address The MAC address associated with the DHCP client that sent the mes-
sage. This is the Key to the binding database.
VLAN ID The VLAN ID of the client interface.
IP Address The IP address assigned to the client by the DHCP server.
Lease Time The remaining IP address lease time for the client.
Refresh Click Refresh to update the screen.
Clear Click Clear to remove the selected entries in the database.