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C H A P T E R 1 Overview
5
Full-Duplex Support
The 480T routing switch provides full-duplex support for all ports.
Full-duplex mode allows frames to be transmitted and received
simultaneously and, in effect, doubles the bandwidth available on a
link. All 100/1000 Mbps ports on the 480Tswitch autonegotiate for
half-duplex or full-duplex operation.
The 1000BASE-SX, 1000BASE-LX and 1000LH ports operate in
full-duplex mode only.
Virtual LANs (VLANs)
The local management software has a VLAN feature that enables you
to construct your broadcast domains without being restricted by
physical connections. A VLAN is a group of location and topology-
independent devices that communicate as if they were on the same
physical LAN.
Implementing VLANs on your network has three advantages:
• Better broadcast traffic control - If a device in VLAN Marketing
transmits a broadcast frame, only VLAN Marketing devices
receive the frame.
See Chapter 7, "Virtual
LANs (VLANs)" on
page 95.
• Extra security - Devices in VLAN Marketing can only
communicate with devices in VLAN Sales using routing services.
• Easier to change or move devices on your networks.
Spanning Tree Protocol (STP)
The 480T routing switch supports the IEEE 802.1D Spanning Tree
Protocol (STP), a bridge-based method of providing fault tolerance
on networks. STP enables you to implement parallel paths for
network traffic, and ensure that redundant paths are:
See Chapter 9,
"Spanning Tree
Protocol (STP)" on
page 125.
• Disabled when the main paths are operational.
• Enabled if the main traffic paths fail.
A single spanning tree may span multiple VLANs.