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3com S7906E Manuel De Montage

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3-8 
To do… 
Use the command… 
Remarks 
Configure the 
padding content 
for the circuit ID 
sub-option 
dhcp relay information 
circuit-id string circuit-id 
Optional 
By default, the padding 
content depends on the 
padding format of Option 
82. 
Configure 
user-defined 
Option 82 
Configure the 
padding content 
for the remote ID 
sub-option 
dhcp relay information 
remote-id string 
{ remote-id | sysname } 
Optional 
By default, the padding 
content depends on the 
padding format of Option 
82. 
 
 
z 
To support Option 82, it is required to perform related configuration on both the DHCP server and 
 for DHCP server configuration of 
this kind. 
z 
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. 
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. 
 
Displaying and Maintaining DHCP Relay Agent Configuration 
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 Option 82 configuration 
information on the DHCP relay agent 
display dhcp relay information 
{ 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 any view