Huawei Quidway S3100 Series User Manual

Operation Manual – DHCP-Snooping
Quidway S3100 Series Ethernet Switches Chapter 1 DHCP-Snooping Configuration
Huawei Technologies Proprietary
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Chapter 1 DHCP-Snooping Configuration
1.1 DHCP-Snooping Overview
1.1.1 Implementation of the DHCP-Snooping Function
For security consideration, a network administrator may need to record the IP address
which a user uses to access the network. This helps to check the correspondence
between the IP address obtained from the DHCP server and user host’s MAC address.
z A Layer 3 switch records user IP address through DHCP relay.
z A Layer 2 switch records user IP address by listening DHCP broadcast packets,
which is achieved by employing the DHCP-snooping function.
Figure 1-1 illustrates the diagram of a network with the DHCP-snooping function
implemented. In this network, the DHCP-snooping function is enabled on Switch A, an
S3100 series Ethernet switch.
DHCP Client
DHCP Client
DHCP Client
Ethernet
DHCP Client
Switch A
(DHCP-snooping employed)
-
Internet
DHCP Server
Switch B
(DHCP relay)
Internet
EthernetEthernet
-
DHCP Client
DHCP Client
DHCP Client
Ethernet
DHCP Client
Switch A
(DHCP-snooping employed)
-
Internet
DHCP Server
Switch B
(DHCP relay)
Internet
EthernetEthernet
-
Figure 1-1 Network diagram for DHCP-snooping implementation
Figure 1-2 shows the interaction between a DHCP client and a DHCP server when the
former applies to the latter for an IP address.

Huawei Quidway S3100 Series Specifications

General

Brand	Huawei
Model	Quidway S3100 Series
Category	Switch
Language	English