5-4
Because a DHCP server can interact with a BOOTP client, you can use the DHCP server to assign an
IP address to the BOOTP client, without needing to configure any BOOTP server.
Configuring a DHCP/BOOTP Client
Follow these steps to configure a DHCP/BOOTP client:
Operation
Command
Description
Enter system view
system-view
—
Enter VLAN interface view
interface Vlan-interface
vlan-id
—
Configure the VLAN interface
to obtain IP address through
DHCP or BOOTP
ip address
{
bootp-alloc
|
dhcp-alloc
}
Required
By default, no IP address is
configured for the VLAN
interface.
z
Currently, a Switch 4210 functioning as the DHCP client can use an IP address for 24 days at most.
That is, the DHCP client can obtain an address lease for no more than 24 days even though the
DHCP server offers a longer lease period.
z
A Switch 4210 functioning as a DHCP client supports default route creation. That is, the DHCP
client creates a default route with the next hop being the gateway assigned by the DHCP server. To
view detailed information about the default route, run the
display ip routing-table
command on
the switch.
To improve security and avoid malicious attack to the unused SOCKETs, Switch 4210 Family provide
the following functions:
z
UDP 67 and UDP 68 ports used by DHCP are enabled only when DHCP is enabled.
z
UDP 67 and UDP 68 ports are disabled when DHCP is disabled.
The specific implementation is:
z
Using the
ip address dhcp-alloc
command enables the DHCP client, and UDP port 68.
z
Using the
undo
ip address dhcp-alloc
command disables the DHCP client, and UDP port 68.
