D-Link DES-3326 User Manual - Vlans In Layer 2 Only Mode
24-port NWay Ethernet Switch User’s Guide
66
Switch Management and Operating Concepts
Even though a switch inspects a packet’s IP address to determine
VLAN membership, no route calculation is performed, the RIP
protocol is not employed, and packets traversing the switch are
bridged using the Spanning Tree algorithm.
A switch that implements layer 3 (or ‘subnet’) VLANs without
performing any routing function between these VLANs is
referred to as performing ‘IP Switching’.
Note: IP switching does not allow packets to cross
VLANs (in this case – IP subnets) without a network
device performing a routing function between the VLANs
(IP subnets).
Note: The DES-3326 switch does not directly support IP
switching, however it is possible to do the equivalent by
assigning IP subnets to configured VLANs and then
disabling the Routing Information Protocol (RIP). This
will prevent packets from crossing IP subnets without
going through an external router.
VLANs in Layer 2 Only Mode
The switch initially configures one VLAN, VID = 1, called the
DEFAULT_VLAN. The factory default setting assigns all ports
on the switch to the DEFAULT_VLAN. As new VLANs are
configured, there respective member ports are removed from the
DEFAULT_VLAN. If the DEFAULT_VLAN is reconfigured, all
ports are again assigned to it. Ports that are not desired to be
part of the DEFAULT_VLAN are removed during the
configuration.
Packets cannot cross VLANs if the switch is in Layer 2 Only
mode. If a member of one VLAN wants to connect to another
VLAN, the link must be through an external router.