H3C Technologies H3C S3100 Series Switches - Manual (Page 359)

Operation Manual – DLDP
H3C S3100-52P Ethernet Switch Chapter 2 DHCP Snooping Configuration
2-2
DHCP client
DHCP server
DHCP client
DHCP client
DHCP client
DHCP server
DHCP server
DHCP-R
equest
DHC
P-Off
er
DHC
P-AC
K
DHCP- R
enew
DHC
P-AC
K
DHCP-D
iscover
DHCP-R
equest
DHC
P-Off
er
DHC
P-AC
K
DHCP- R
enew
DHC
P-AC
K
DHCP-R
equest
DHC
P-Off
er
DHC
P-AC
K
DHCP- R
enew
DHC
P-AC
K
DHCP-D
iscover
DHCP client
DHCP server
DHCP client
DHCP client
DHCP client
DHCP server
DHCP server
DHCP-R
equest
DHC
P-Off
er
DHC
P-AC
K
DHCP- R
enew
DHC
P-AC
K
DHCP client
DHCP server
DHCP client
DHCP client
DHCP client
DHCP server
DHCP server
DHCP-R
equest
DHC
P-Off
er
DHC
P-AC
K
DHCP- R
enew
DHC
P-AC
K
DHCP-D
iscover
DHCP-R
equest
DHC
P-Off
er
DHC
P-AC
K
DHCP- R
enew
DHC
P-AC
K
DHCP-R
equest
DHC
P-Off
er
DHC
P-AC
K
DHCP- R
enew
DHC
P-AC
K
DHCP-D
iscover
Figure 2-2
Interaction between a DHCP client and a DHCP server
DHCP snooping listens the following two types of packets to retrieve the IP addresses
the DHCP clients obtain from DHCP servers and the MAC addresses of the DHCP
clients:
z
DHCP-ACK packet
z
DHCP-REQUEST packet
2.2 DHCP Snooping Configuration
Table 2-1
Configure the DHCP snooping function
Operation Command Description
Enter system view system-view —
Enable the DHCP
snooping function
dhcp-snooping
Required
By default, the DHCP
snooping function is disabled.
Enter Ethernet port
view
interface interface-type
interface-number
—