DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
90 Switch Management and Operating Concepts
The 6 IP interfaces, each with an IP address (listed in the table
above), and a subnet mask of 255.224.0.0 can be entered into
the Setup IP Interface menu.
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’.
Internet Protocols
This is a brief introduction to the suite of Internet Protocols
frequently referred to as TCP/IP. It is intended to give the
reader a reasonable understanding of the available facilities
and some familiarity with terminology. It is not intended to be
a complete description.
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