Huawei Quidway S5600 Series - Page 672

Operation Manual - DHCP
Quidway S5600 Series Ethernet Switches-Release 1510 Chapter 3
DHCP Relay Configuration
Huawei Technologies Proprietary
3-5
3.2.3 Configuring an Interface to Operate in DHCP Relay Mode
When an interface operates in the relay mode, the interface forwards the DHCP
packets received from DHCP clients to an external DHCP server, which assigns IP
addresses to the DHCP clients.
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:
z You can configure up to eight external DHCP IP addresses in a DHCP server
group.
z You can map multiple VLAN interfaces to one DHCP server group. But one VLAN
interface can be mapped to only one DHCP server group. If you execute the
dhcp-server groupNo command repeatedly, the new configuration overwrites the
previous one.
z You need to configure the group number specified in the dhcp-server groupNo
command in VLAN interface view by using the command dhcp-server groupNo ip
ipaddress-address&<1-8> in advance.
 Note:
To prevent malicious attacks to unused sockets and enhance security, S5600 series
Ethernet switches provide the following functions: