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The switch supports a random delay time for DHCP and boot delay for each device. This
suppresses the broadcast storm while all devices are booting at the same time. The maximum
user-defined delay time is 30 seconds. If DHCP Broadcasting Suppression function is enabled,
the delay time is set randomly, ranging from 0 to 30 seconds. The exact delay time is computed
by the switch itself. The default is Disable.
5.16
VLANs
The switch supports Tag-based VLAN (802.1q) and Port-based VLANs. 256 active VLANs are
supported and VLAN ID can range from 1~4094. VLAN configuration is used to partition your
LAN into small segments based on your LAN requirements. By properly configuring VLANs,
you can improve security and increase performance.
5.16.1 VLAN Mode
Function name:
VLAN Mode Setting
Function description:
The VLAN Mode Selection function includes five modes: Port-based, Tag- based, Metro Mode,
Double-tag and Disable. Choose a mode by using the drop-down list and selecting an item. Click
Apply and the settings will take effect immediately.
Parameter description:
VLAN Mode:
Disable:
Stop VLAN function on the switch. In this mode, no VLAN is applied to the switch. This is
the default setting.
Port-based:
Port-based VLAN is defined by port. Any packet coming in or out from any one port of a
port-based VLAN will be accepted. No filtering criterion applies in port-based VLAN. The
only criterion is the physical port you connect to. For example, for a port-based VLAN
named PVLAN-1 contains port members Ports 1, 2, 3 & 4, and if you are connected to Port
1, you can communicate with Port 2-4. If you are connected to Port 5, you cannot
Waters Network Systems
Figure 5.27 – DHCP Boot
User's Manual
GSM-2108/GSM-1008SFP
Page 56
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