Dhcp Snooping Vlan Configure - ZyXEL Communications GS1350 Series User Manual

Table 84 Advanced Application > DHCP Snooping > Configure > Port (continued)
L ABEL
Server Trusted state
Rate (pps)
Apply
Cancel
23.3.2 DHC P Sno o ping VL AN C o 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
relays to a DHCP server for each VLAN. To open this screen, click
>
Sno o ping C o nfig ure
Advanced Application > DHCP Snooping > Configure > VLAN
Fig ure 138
The following table describes the labels in this screen.
Table 85 Advanced Application > DHCP Snooping > Configure > VLAN
L ABEL
VLAN Search by VID
Search
Chapter 23 DHCP Snooping
DESC RIPT IO N
Select whether this port is a trusted port (
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.
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.
Click to save your changes to the Switch's run-time memory. The Switch loses these
Apply
changes if it is turned off or loses power, so use the
save your changes to the non-volatile memory when you are done configuring.
Click this to reset the values in this screen to their last-saved values.
(Chapter 31 on page
> .
VL AN
DESC RIPT IO N
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".
Click this to display the specified range of VLANs in the section below.
GS1350 Series User's Guide
191
) or an untrusted port (
T ruste d
link on the top navigation panel to
Sa ve
241) to DHCP requests that the Switch
Adva nc e d Applic a tio n
).
Untruste d
>
DHC P