GS2220 Series User’s Guide
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Fig ure 200 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Configure > Port
The following table describes the labels in this screen.
27.3.2 DHC P Sno o ping VLAN Co nfig ure
Use this screen to enable DHCP snooping on each VLAN and to specify whether or not the Switch adds
DHCP relay agent option 82 information to DHCP requests that the Switch relays to a DHCP server for
each VLAN.
Table 123 Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
Configure > Port
LABEL DESC RIPTIO N
Port This field displays the port number.
* Settings in this row apply to all ports.
Use this row only if you want to make some settings the same for all ports. Use this row first to
set the common settings and then make adjustments on a port-by-port basis.
Note: Changes in this row are copied to all the ports as soon as you make them.
Server Trusted state Select whether this port is a trusted port (Truste d) or an untrusted port (Untruste d).
Trusted ports are connected to DHCP servers or other switches, and the Switch discards
DHCP packets from trusted ports only if the rate at which DHCP packets arrive is too high.
Untrusted ports are connected to subscribers, and the Switch discards DHCP packets from
untrusted ports in the following situations:
• The packet is a DHCP server packet (for example, OFFER, ACK, or NACK).
• The source MAC address and source IP address in the packet do not match any of the
current bindings.
• The packet is a RELEASE or DECLINE packet, and the source MAC address and source
port do not match any of the current bindings.
• The rate at which DHCP packets arrive is too high.
Rate (pps) Specify the maximum number for DHCP packets (1 – 2048) that the Switch receives from
each port each second. The Switch discards any additional DHCP packets. Enter 0 to
disable this limit, which is recommended for trusted ports.
Apply Click Apply to save your changes to the Switch’s run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the Sa ve link on the top navigation panel to
save your changes to the non-volatile memory when you are done configuring.
Cancel Click this to reset the values in this screen to their last-saved values.
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