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About the Switch 3000 TX 1-3
Virtual LANs (VLANs)
The Switch 3000 TX has a Virtual LAN (VLAN) fea-
ture which allows you to build your network seg-
ments without being restricted by physical
connections. A VLAN is defined as a group of loca-
tion- and topology-independent devices that com-
municate as if they are on the same physical LAN.
Implementing VLANs on your network has three
main advantages:
■
It eases the change and movement of devices on
IP networks. If an endstation in VLAN 1 is moved
to a port in another part of the network, you only
need to specify that the new port is in VLAN 1.
■
It helps to control broadcast traffic. If an endsta-
tion in VLAN 1 transmits a broadcast frame,
then only VLAN 1 devices receive the frame.
■
It provides extra security. Devices in VLAN 1 can
only communicate with devices in VLAN 2 using
a router.
For more information about VLANs, refer to “
Virtual
LANs (VLANs)” on page 5-1.
Spanning Tree Protocol
The Switch 3000 TX supports the Spanning Tree
Protocol (STP) which is a bridge-based system for
providing fault tolerance on networks. STP allows
you to implement parallel paths for network traffic,
and ensure that:
■
Redundant paths are disabled when the main
paths are operational
■
Redundant paths are enabled if the main traffic
paths fail
For more information about STP, refer to “
Spanning
Tree Protocol” on page 5-12.
PACE
The Switch 3000 TX supports PACE (Priority Access
Control Enabled) technology, which allows multime-
dia traffic to be carried over standard Ethernet and
Fast Ethernet LANs. PACE provides two features:
■
Implicit Class of Service
— When multimedia traf-
fic is transmitted, it is given a higher priority
than other data and is therefore forwarded ahead
of other data when it arrives at the Switch. The
Implicit Class of Service feature minimizes latency
through the Switch and protects the quality of
multimedia traffic.
■
Interactive Access
— When two-way multimedia
traffic passes over an Ethernet network, interfer-
ence can occur because access to the bandwidth
is unequally allocated to traffic in one direction.
The Interactive Access feature allocates the avail-
able bandwidth equally in both directions, there-
fore increasing the quality of the traffic.
For more information about setting up PACE on the
Switch, refer to “
Setting Up the Switch Unit” and
“
Setting Up the Switch Ports” in Chapter 4.