xStack
®
DGS-3426G Layer 2 Gigabit Ethernet Managed Switch
52
Relay State
This field can be toggled between Enabled and Disabled using the drop-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)
Allows an entry between 0 and 65535 seconds, and defines the maximum time limit for
routing a DHCP/BOOTP packet. If a value of 0 is entered, the Switch will not process the
value in the seconds field of the BOOTP or DHCP packet. If a non-zero value is entered,
the Switch will use that value, along with the hop count to determine whether to forward a
given BOOTP or DHCP packet.
DHCP Vendor class
identifier option 60
State
This function Enables or Disables the DHCP Vendor class identifier option 60 state. When
option 60 is enabled, if the packet does not have option 60, then the relay servers cannot
be determined based on option 60. The relay servers will be determined based on either
option 60 or per IPIF configured servers. If the relay servers are determined based on
option 60, then the IPIF configured servers will be ignored. If the relay servers are not
determined by option 60 then the IPIF configured servers will be used to determine the
relay servers.
DHCP Client identifier
option 61 State
This function Enables or Disables the DHCP Client identifier option 61 state. When option
61 State is enabled, if the packet does not have option 61, then the relay servers cannot be
determined based on option 61. The relay servers will be determined based on option 61
and the IPIF configured servers will be ignored. If the relay servers are not determined
either by option 60 or option 61, then IPIF configured servers will be used to determine the
relay servers.
DHCP Relay Agent
Information Option 82
State
This field can be toggled between Enabled and Disabled using the drop-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 Relay Agent
Information Option 82
Check
This field can be toggled between Enabled and Disabled using the drop-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.
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