D-Link DES-3550 Инструкция по эксплуатации онлайн [128/260] 40392
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D-Link DES-3550 Инструкция по эксплуатации онлайн [128/260] 40392

D-Link DES-3550 Инструкция по эксплуатации онлайн [128/260] 40392
DES-3550 Fast Ethernet Layer 2 Switch
Parameter Description
Relay State
This field can be toggled between Enabled and Disabled using the pull-down menu.
It is used to enable or disable the DHCP/BOOTP Relay service on the Switch. The
default is Disabled
Relay Hops Count
Limit (1-16)
This field allows an entry between 1 and 16 to define the maximum number of router
hops DHCP/BOOTP messages can be forwarded across. The default hop count is 4.
Relay Time Threshold
(0-65535)
This is used to make a forwarding decision. When a DHCP/BOOTP client sends a
request, information is inserted regarding the time (in seconds) elapsed since that
client began booting up. This information is read by the Switch. The Switch forwards
a DHCP request if the time elapsed is equal to or greater than the time parameter
entered here. If the elapsed time is less, the DHCP request is dropped. The default
value = 0, so the default setting requires the Switch to forward all DHCP requests.
Entering a value greater than zero here can used to provide redundancy or backup
in order to forward a DHCP request from a client that is not normally served by the
Switch.
DHCP Agent
Information Option 82
State
This field can be toggled between Enabled and Disabled using the pull-down menu.
It is used to enable or disable the DHCP Agent Information Option 82 on the Switch.
The default is Disabled.
Enabled –When this field is toggled to Enabled the relay agent will insert and remove
DHCP relay information (option 82 field) in messages between DHCP servers and
clients. When the relay agent receives the DHCP request, it adds the option 82
information, and the IP address of the relay agent (if the relay agent is configured), to
the packet. Once the option 82 information has been added to the packet it is sent
on to the DHCP server. When the DHCP server receives the packet, if the server is
capable of option 82, it can implement policies like restricting the number of IP
addresses that can be assigned to a single remote ID or circuit ID. Then the DHCP
server echoes the option 82 field in the DHCP reply. The DHCP server unicasts the
reply to the back to the relay agent if the request was relayed to the server by the
relay agent. The switch verifies that it originally inserted the option 82 data. Finally,
the relay agent removes the option 82 field and forwards the packet to the switch
port that connects to the DHCP client that sent the DHCP request.
Disabled- If the field is toggled to Disabled the relay agent will not insert and remove
DHCP relay information (option 82 field) in messages between DHCP servers and
clients, and the check and policy settings will have no effect.
DHCP Agent
Information Option 82
Check
This field can be toggled between Enabled and Disabled using the pull-down menu.
It is used to enable or disable the Switches ability to check the validity of the packet’s
option 82 field.
Enabled– When the field is toggled to Enable, the relay agent will check the validity
of the packet’s option 82 field. If the switch receives a packet that contains the
option-82 field from a DHCP client, the switch drops the packet because it is invalid.
In packets received from DHCP servers, the relay agent will drop invalid messages.
Disabled- When the field is toggled to Disabled, the relay agent will not check the
validity of the packet’s option 82 field.
DHCP Agent
Information Option 82
Policy
This field can be toggled between Replace, Drop, and Keep by using the pull-down
menu. It is used to set the Switches policy for handling packets when the DHCP
Agent Information Option 82 Check is set to Disabled. The default is Replace.
Replace- The option 82 field will be replaced if the option 82 field already exists in
the packet received from the DHCP client.
Drop- The packet will be dropped if the option 82 field already exists in the packet
received from the DHCP client.
Keep-The option 82 field will be retained if the option 82 field already exists in the
packet received from the DHCP client.
Click Apply to implement any changes that have been made.
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