Dhcp Snooping Vlan Configure - ZyXEL Communications MES3500-24S User Manual

The following table describes the labels in this screen.
Table 109 Advanced Application > IP Source Guard > DHCP Snooping Port Configure
LABEL
Port
Server Trusted
state
Rate (pps)
Apply
Cancel

27.5.2 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
relays to a DHCP server for each VLAN. To open this screen, click Advanced Application > IP Source
Guard > DHCP Snooping > Configure > VLAN.
Figure 145 Advanced Application > IP Source Guard > DHCP Snooping > Configure > VLAN
Chapter 27 IP Source Guard
DESCRIPTION
This field displays the port number. If you configure the * port, the settings are applied to all of the
ports.
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.
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.
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.
Click this to reset the values in this screen to their last-saved values.
(Chapter 39 on page
MES3500-24S/MGS3520 Series User's Guide
320) to DHCP requests that the Switch
247