ZyXEL Communications XMG1915 Series - DHCP Snooping VLAN Setup

Chapter 58 DHCP Snooping
XMG1915 Series User’s Guide
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58.5 DHCP Snooping VLAN Setup
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 SECURITY > DHCP Snooping > DHCP Snp. VLAN Setup.
Figure 246 SECURITY > DHCP Snooping > DHCP Snp. VLAN Setup
The following table describes the labels in this screen.
Table 191 SECURITY > DHCP Snooping > DHCP Snp. VLAN Setup
LABEL DESCRIPTION
Search VLAN by VID Enter the VLAN ID you want to manage. Use a comma (,) to separate individual VLANs or a
hyphen (-) 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.
The Number of
VLANs
This displays the number of VLAN search results.
VID This field displays the VLAN ID of each VLAN in the range specified above. If you configure
the * VLAN, the settings are applied to all VLANs.
Enabled Select Yes to enable DHCP snooping on the VLAN. You still have to enable DHCP snooping
on the Switch and specify trusted ports.
Note: The Switch will drop all DHCP requests if you enable DHCP snooping and
there are no trusted ports.
Option 82 Profile Select a pre-defined DHCP option 82 profile that the Switch applies to all ports in the
specified VLANs. The Switch adds the information (such as slot number, port number, VLAN ID
and/or system name) specified in the profile to DHCP requests that it broadcasts to the DHCP
VLAN, if specified, or VLAN. You can specify the DHCP VLAN in the SECURITY > DHCP
Snooping > DHCP Snp. Setup screen.
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.