H3C S3600 Series User Manual

Operation Manual – DHCP
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 3
DHCP Relay Configuration
3-5
To enhance reliability, you can set multiple DHCP servers on the same network. These
DHCP servers form a DHCP server group. When the interface establishes mapping
relationship with the DHCP server group, the interface forwards the DHCP packets to
all servers in the server group.
Table 3-3 Configure an interface to operate in DHCP relay mode
Operation Command Description
Enter system view
system-view
—
Configure the
DHCP server IP
address(es) in a
specified DHCP
server group
dhcp-server groupNo ip
ip-address&<1-8>
Required
By default, no DHCP server IP
address is configured in a
DHCP server group.
interface interface-type
interface-number
Map an interface to
a DHCP server
group
dhcp-server groupNo
Required
By default, a VLAN interface
is not mapped to any DHCP
server group.
 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 When a VLAN interface is mapped to a DHCP server group with the dhcp-server
command, the DHCP relay agent is enabled. At the same time, UDP 67 and UDP 68
ports used by DHCP are enabled.
z When the mapping between a VLAN interface and a DHCP server group is removed
with the undo dhcp-server command, DHCP services are disabled. At the same
time, UDP 67 and UDP 68 ports are disabled.

H3C S3600 Series Specifications

General

Brand	H3C
Model	S3600 Series
Category	Switch
Language	English