H3C S3600 Series User Manual

Operation Manual – DHCP
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 2
DHCP Server Configuration
2-15
Table 2-13 Configure to assign the IP addresses of interface address pools to DHCP
clients
Operation Command Description
Enter system view
system-view
—
interface interface-type
interface-number
dhcp select interface
Configure
e current
interface
th
quit
Configure to
assign the IP
addresses of
interface
address pools
to DHCP clients
Configure
multiple
interfaces in
system view
dhcp select interface
{ interface interface-type
interface-number [ to
interface-type
interface-number ] | all }
Required
By default, a DHCP
server assigns the
IP addresses of the
global address pool
to DHCP clients.
 Note:
To improve security and avoid malicious attack to the unused SOCKETs, S3600
Ethernet switches 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 corresponding implementation is as follows:
z After a DHCP interface address pool is created by executing the dhcp select
interface command, UDP 67 and UDP 68 ports used by DHCP are enabled.
z After a DHCP interface address pool is deleted by executing the undo dhcp select
interface command and all other DHCP functions are disabled, UDP 67 and UDP
68 ports used by DHCP are disabled accordingly.
2.3.4 Configuring the Mode to Assign IP Addresses to DHCP Clients
IP addresses of an interface address pool can be statically bound to DHCP clients or
dynamically allocated to DHCP clients.
I. Configuring to assign IP addresses by static binding
Some DHCP clients, such as WWW servers, need fixed IP addresses. This is achieved
by binding IP addresses to the MAC addresses of these DHCP clients. When such a
DHCP client applies for an IP address, the DHCP server finds the IP address
corresponding to the MAC address of the DHCP client, and then assigns the IP address
to the DHCP client.
When some DHCP clients send DHCP-DISCOVER packets to the DHCP server to
apply for IP addresses, they construct client IDs and add them in the

H3C S3600 Series Specifications

General

Brand	H3C
Model	S3600 Series
Category	Switch
Language	English