3Com S7902E Command Reference Manual - page 539
2-4
[Sysname-Vlan-interface1] dhcp relay information enable
dhcp relay information format
Syntax
dhcp relay information format
{
normal
|
verbose
[
node-identifier
{
mac
|
sysname | user-defined
node-identifier
} ] }
undo dhcp relay information format
[
verbose node-identifier
]
View
Interface view
Default Level
2: System level
Parameters
normal
: Specifies the normal padding format.
verbose
: Specifies the verbose padding format.
node-identifier
{
mac
|
sysname
|
user-defined
node-identifier
}: Specifies access node identifier. By
default, the node MAC address is used as the node identifier.
z
mac
indicates using MAC address as the node identifier.
z
sysname
indicates using the device name of a node as the node identifier.
z
user-defined
node-identifier
indicates using a specified character string as the node identifier, in
which
node-identifier
is a string with 1 to 50 characters.
Description
Use the
dhcp relay information format
command to specify a padding format for Option 82.
Use the
undo dhcp relay information format
command to restore the default padding format.
The Option 82 padding format defaults to
normal
.
z
Using the
undo dhcp relay information format
command without the keyword
verbose
node-identifier
restores the default
normal
padding format, or with the keyword
verbose
node-identifier
restores the
mac
mode of the
verbose
padding format.
z
If configuring the handling strategy of the DHCP relay agent as
replace
, you need to configure a
padding format of Option 82. If the handling strategy is
keep
or
drop
, you need not configure any
padding format.
z
If sub-option 1 (node identifier) of Option 82 is padded with the device name (sysname) of a node,
the device name must contain no spaces. Otherwise, the DHCP relay agent will drop the message.
Examples
# Specify the verbose padding format for Option 82.