3Com 1000 - Manual (Page 13)

About the Switch 1000 1-5
For more information about enabling full duplex,
refer to
“Setting Up the Switch Unit” and “Setting
Up the Switch Ports” in Chapter 4 .
Security
The Switch 1000 contains advanced security fea-
tures which guard against users connecting unau-
thorized endstations to your network. When security
is enabled on a port, it enters single address learn-
ing mode. In this mode, the port learns a single
Ethernet address; once this is learned, the port is
disabled if a different address is seen on the port.
Until security is disabled, no other address can be
learned.
For more information about security, refer to “Set-
ting Up the Switch Ports” on page 4-12 .
Resilient Links
The Resilient Link feature in the Switch 1000
enables you to protect critical links and prevent net-
work downtime should those links fail.
Setting up resilience ensures that should a main
communication link fail, a standby duplicate link
immediately and automatically takes over the task of
the main link. Each main and standby link pair is
referred to as a resilient link pair.
For more information about resilient links, refer to
“Setting Up Resilient Links” on page 4-19 .
Virtual LANs
The Switch 1000 has a Virtual LAN (VLAN) feature
which allows you to build your network segments
without being restricted by physical connections. A
VLAN is defined as a group of location- and
topology-independent devices that communicate 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 setting up VLANs on
the Switch, refer to
“Virtual LANs (VLANs)” on page
5-1 .
Spanning Tree Protocol
The Switch 1000 supports the Spanning Tree Proto-
col (STP) which is a bridge-based system for provid-
ing 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.