3Com Switch 4800G 24-Port - Displaying and Maintaining DHCP Relay Agent Configuration

Displaying and Maintaining DHCP Relay Agent Configuration 819
■ Enabling the DHCP relay agent on the specified interface
■ Correlating a DHCP server group with relay agent interfaces
Configuring the DHCP relay agent to support Option 82
Follow these steps to configure the DHCP relay agent to support Option 82:
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■ To support Option 82, it is required to perform related configuration on both
the DHCP server and relay agent. Refer to “Configuring the Handling Mode for
Option 82” on page 808 for DHCP server configuration of this kind.
■ If the handling strategy of the DHCP relay agent is configured as replace, you
need to configure a padding format for Option 82. If the handling strategy is
keep or drop, you need not configure any padding format.
■ 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.
Displaying and
Maintaining DHCP
Relay Agent
Configuration
To do… Use the command… Remarks
Enter system view system-view -
Enter interface view interface interface-type
interface-number
-
Enable the relay agent to
support Option 82
dhcp relay information enable Required
Disabled by default.
Configure the handling
strategy for requesting
messages containing Option 82
dhcp relay information strategy
{ drop | keep | replace }
Optional
replace by default.
Configure the padding format
for Option 82
dhcp relay information format
{ normal | verbose [ node-identifier
{ mac | sysname | user-defined
node-identifier }]}
Optional
normal by default.
To do… Use the command… Remarks
Display information about DHCP
server groups correlated to a
specified or all interfaces
display dhcp relay { all | interface
interface-type interface-number }
Available in any
view
Display information about bindings
of DHCP relay agents
display dhcp relay security
[ ip-address | dynamic | static ]
Available in any
view
Display statistics information about
bindings of DHCP relay agents
display dhcp relay security
statistics
Available in any
view
Display information about the
refreshing interval for entries of
dynamic IP-to-MAC bindings
display dhcp relay security
tracker
Available in any
view
Display information about the
configuration of a specified or all
DHCP server groups
display dhcp relay server-group
{ group-id | all }
Available in any
view
Display packet statistics on relay
agent
display dhcp relay statistics
[ server-group { group-id | all }]
Available in user
view
Clear packet statistics from relay
agent
reset dhcp relay statistics
[ server-group group-id ]
Available in user
view