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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 VH-2402-L3 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.
Protocol Layering
The Internet Protocol (IP) divides the tasks necessary to
route and forward packets across networks by using a
layered approach. Each layer has clearly defined tasks,
protocol, and interfaces for communicating with adjacent
layers, but the exact way these tasks are accomplished is
left to individual software designers. The Open Systems
Interconnect (OSI) seven-layer model has been adopted as
the reference for the description of modern networking,
including the Internet.
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