33
DHCP
Relay
Agent:
The
DHCP
Relay
Agent
is
also
known
as
DHCP
Option
82.
It
can
help
relay
the
DHCP
Request
to
remote
DHCP
server
located
in
different
subnet.
Note:
The
DHCP
Server
can
not
work
with
DHCP
Relay
Agent
at
the
same
time.
Relay
Agent:
Choose
Enable
or
Disable
the
relay
agent.
Relay
Policy:
The
Relay
Policy
is
used
when
the
DHCP
request
is
relayed
through
more
than
one
switch.
The
switch
can
drop,
keep
or
replace
the
MAC
address
of
the
DHCP
Request
packet.
Helper
Address:
Type
the
IP
address
of
the
target
DHCP
Server.
There
are
4
available
IP
addresses.
4.2.7
Backup
and
Restore
With
Backup
command,
you
can
save
current
configuration
file
saved
in
the
switch’s
flash
to
admin
PC
or
TFTP
server.
This
will
allow
you
to
go
to
Restore
command
later
to
restore
the
configuration
file
back
to
the
switch.
Before
you
restore
the
configuration
file,
you
must
place
the
backup
configuration
file
in
the
PC
or
TFTP
server.
The
switch
will
then
download
this
file
back
to
the
flash.
There
are
2
modes
for
users
to
backup/restore
the
configuration
file,
Local
File
mode
and
TFTP
Server
mode.
Local
File
mode:
In
this
mode,
the
switch
acts
as
the
file
server.
Users
can
browse
the
target
folder
and
then
type
the
file
name
to
backup
the
configuration.
Users
can
also
browse
the
target
folder
and
select
existed
configuration
file
to
restore
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