Chapter 23 DHCP Snooping
GS1350 Series User’s Guide
191
23.3.2 DHCP Snooping VLAN Configure
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. To open this screen, click
Advanced Application
>
DHCP
Snooping
>
Configure
>
VLAN
.
Figure 138
Advanced Application > DHCP Snooping > Configure > VLAN
The following table describes the labels in this screen.
Server Trusted state
Select whether this port is a trusted port (
Trusted
) or an untrusted port (
Untrusted
).
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 (1-256) 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
Save
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.
Table 84 Advanced Application > DHCP Snooping > Configure > Port (continued)
LABEL
DESCRIPTION
Table 85 Advanced Application > DHCP Snooping > Configure > VLAN
LABEL
DESCRIPTION
VLAN Search by VID Specify the VLANs you want to manage in the section below. Use a comma (,) to separate
individual VLANs or a dash (–) to indicates a range of VLANs. For example, “3,4” or “3–9”.
Search
Click this to display the specified range of VLANs in the section below.
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