3com 1000 User Manual
About the Switch 1000
1-5
For more information about enabling full duplex,
refer to
refer to
and
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.
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
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.
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.
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
on
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:
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.
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.
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.
only communicate with devices in VLAN 2 using
a router.
For more information about setting up VLANs on
the Switch, refer to
the Switch, refer to
.
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:
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.
paths are operational.