Dhcp Relay - 3Com 7700 Configuration Manual

DHCP Relay

Manually Add/Delete Static ARP Mapping Entries
Perform the following configuration in System view.
Table 4 Manually Add/Delete Static ARP Mapping Entries
Operation
Manually add a static ARP mapping
entry
Manually delete a static ARP
mapping entry
Note: Static ARP mapping entries will not time out, however dynamic ARP
mapping entries time out after 20 minutes.
The ARP mapping table is empty and the address mapping is obtained through
dynamic ARP by default.
Configuring the Dynamic ARP Aging Timer
The system provides the following commands to assign a dynamic ARP aging
period to enable flexible configurations. When the system learns a dynamic ARP
entry, its aging period is based on the current value that is configured.
Perform the following configuration in system view.
Table 5 Configure the Dynamic ARP Aging Timer
Operation
Configure the dynamic ARP aging timer
Restore the default dynamic ARP aging time
By default, the aging time of the dynamic ARP aging timer is 20 minutes.
Displaying and Debugging ARP
After the previous configuration, execute
the running of the ARP configuration, and to verify the effect of the configuration.
Execute command in user view to debug ARP configuration.
debugging
Table 6 Display and Debug ARP
Operation
Display ARP mapping table
Display the current setting of the
dynamic ARP map aging timer
Enable ARP information debugging debugging arp { packet | status }
Disable ARP information debugging undo debugging arp { packet | status }
All ARP mapping entries of the Ethernet switch are displayed by default.
Dynamic Host Configuration Protocol (DHCP) is used to ease entry and exit to the
network. It is also used to improve the use of the IP addresses in remote locations
or where the host number exceeds the number of allocated IP addresses. DHCP
works in Client-Server mode. With this protocol, the DHCP Client can dynamically
request configuration information and the DHCP server can configure the
information for the Client.
Command
arp static ip-address mac-address VLANID {
interface_type interface_num | interface_name }
undo arp static ip-address
Command
arp timer aging aging-time
undo arp timer aging
command in all views to display
display
Command
display arp [ static | dynamic | ip-address ]
display arp timer aging
DHCP Relay 51