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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
80 Switch Management and Operating Concepts
A VLAN that does not have a corresponding IP interface defined
for it, will function as a Layer 2 Only VLAN – regardless of the
Switch Operation mode.
Layer 3-Based VLANs
Layer 3-based VLANs use network-layer addresses (subnet
address for TCP/IP) to determine VLAN membership. These
VLANs are based on layer 3 information, but this does not
constitute a ‘routing’ function.
The DES-3326S allows an IP subnet to be configured for each
802.1Q VLAN that exists on the switch.
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’.
IP Addressing and Subnetting
This section gives basic information needed to configure your
Layer 3 switch for IP routing. The information includes how IP
addresses are broken down and how subnetting works. You
will learn how to assign each interface on the router an IP
address with a unique subnet.
Definitions
• IP Address – the unique number ID assigned to each host or
interface on a network. IP addresses have the form
xxx.xxx.xxx.xxx.