DAS-3626 VDSL2 Switch User Manual
DHCP Relay
The DHCP Relay folder contains six windows regarding the DHCP relay functions on the switch. The DHCP menus
include
DHCP Relay Global Settings
,
DHCP Relay Interface Settings
,
DHCP Relay Option 60 Default Settings
,
DHCP Relay Option 82 Settings Remote ID
,
DHCP Realy Option 82 Settings Circuit ID
and
DHCP Relay Option
82 Settings
.
DHCP Relay Global Settings
This window is used to enable and configure
DHCP Relay Global Settings
on the switch. The relay hops count limit
allows the maximum number of hops (routers) that the DHCP messages can be relayed through to be set. If a
packet’s hop count is more than the hop count limit, the packet is dropped. The range is between
1
and
16
hops, with
a default value of
4
. The relay time threshold sets the minimum time (in seconds) that the switch will wait before
forwarding a DHCP REQUEST packet. If the value in the seconds field of the packet is less than the relay time
threshold, the packet will be dropped. The range is between
0
and
65,536
seconds, with a default value of
0
seconds.
To view this window, click
System Configuration >
DHCP/BOOTP Relay > DHCP/BOOTP Relay Global Settings
as shown below:
Figure 41. DHCP Relay Global Settings menu
The following fields can be set:
Parameter
Description
DHCP 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 Relay service on the switch. The default is
Disabled.
DHCP Relay Hops
Count Limit (1-16)
This field allows an entry between
1
and
16
to define the maximum number of router hops
DHCP messages can be forwarded across. The default hop count is
4
.
DHCP Relay Time
Threshold (0-65535)
Allows an entry between
0
and
65535
seconds, and defines the maximum time limit for
routing a DHCP packet. If a value of 0 is entered, the switch will not process the value in the
seconds
field of the 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 DHCP packet.
Click
Apply
to implement any changes that have been made.
NOTE:
If the switch receives a packet that contains the option-82 field from a DHCP client and the
information-checking feature is enabled, the switch drops the packet because it is invalid. However, in
some instances, you might configure a client with the option-82 field. In this situation, you should
disable the information-check feature so that the switch does not remove the option-82 field from the
packet. You can configure the action that the switch takes when it receives a packet with existing
option-82 information by configuring the
DHCP Agent Information Option 82 Policy
. See the table
below for a description of Option 82 settings as they relate to DSCP Relay.
37
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