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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
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- If a DHCP packet is from server is received on a trusted port, it will be forwarded to both trusted and untrusted ports in
the same VLAN.
• If the DHCP snooping is globally disabled, all dynamic bindings are removed from the binding table.
• Additional considerations when the switch itself is a DHCP client – The port(s) through which the switch submits a client
request to the DHCP server must be configured as trusted. Note that the switch will not add a dynamic entry for itself to the
binding table when it receives an ACK message from a DHCP server. Also, when the switch sends out DHCP client packets
for itself, no filtering takes place. However, when the switch receives any messages from a DHCP server, any packets
received from untrusted ports are dropped.
4.11.15.1 DHCP Snooping Configuration
Use the DHCP Snooping Configuration page to enable DHCP Snooping globally on the Managed Switch, or to configure MAC
Address Verification.
Figure 4-11-45 DHCP Snooping Configuration page screenshot
The page includes the following fields:
Object Description
• DHCP Snooping Status
Enables DHCP snooping globally. (Default: Disabled)
• DHCP Snooping
MAC-Address
Verification
Enables or disables MAC address verification. DHCP packets will be dropped if
the source MAC address in the Ethernet header of the packet is not same as the
client’s hardware address in the DHCP packet.
4.11.15.2 DHCP Snooping VLAN Configuration
Enables DHCP snooping on the specified VLAN.
Command Usage