3com MSR 20-20 참조 매뉴얼

interface interface-type interface-number: Specifies a Layer 3 interface 
connecting to the DHCP client. interface-type interface-number specifies the 
interface type and interface number.

all: Specifies all entries of client IP-to-MAC bindings to be removed.

dynamic: Specifies entries of dynamic client IP-to-MAC bindings to be removed.

static: Specifies entries of manual client IP-to-MAC bindings to be removed.

Use the dhcp relay security static command to configure a static addressing 
binding, that is, the binding between IP address, MAC address, and Layer 3 
interface on the relay agent.

Use the undo dhcp relay security command to remove specified binding 
entries from the relay agent.

No manual IP-to-MAC binding is configured on the DHCP relay agent by default.

Note that:

When using the dhcp relay security static command to bind an interface to a 
static binding entry, make sure that the interface is configured as a DHCP relay 
agent; otherwise, address entry conflicts may occur.

# Bind DHCP relay interface Ethernet 1/0 to IP address 10.10.1.1 and MAC address 
0005-5d02-f2b3 of the client.

<Sysname> system-view

[Sysname] dhcp relay security static 10.10.1.1 0005-5d02-f2b3 interf

ace ethernet 1/0 

dhcp relay security tracker { interval | auto }

undo dhcp relay security tracker [ interval ]

System view

interval: Refreshing interval in seconds, in the range of 1 to 120.

auto: Specifies the auto refreshing interval, which is the value of 60 seconds 
divided by the number of binding entries. Thus, the more entries are, the shorter 
interval is, but the shortest interval is no less than 500 ms.

Use the dhcp relay security tracker command to set a refreshing interval at 
which the relay agent contacts the DHCP server for refreshing dynamic bindings.