3com 3800 Manual De Usuario

C

HAPTER

 1: S

WITCH

 3800 O

VERVIEW

In the event that the active main port fails or loses link status, the 
standby port is automatically activated. When the main port resumes 
operation, the standby port becomes inactive. This feature can be 
disabled. 

Load sharing with Switch 3800 Switches allows the user to increase 
bandwidth and resilience between Switches by using a group of ports 
to carry traffic in parallel between Switches. The sharing algorithm 
allows the Switch to use multiple ports as a single logical port. For 
example, Virtual LANs (VLANs) see the load-sharing group as a single 
virtual port. The algorithm also guarantees packet sequencing between 
clients. 

The Switch 3800 uses the same algorithm as a conventional 802.1d 
bridge for filtering, forwarding, and learning packets.

The Switch 3800 has a Virtual LAN (VLAN) feature that allows you to 
build your network segments without being restricted by physical 
connections. A VLAN is a group of location- and topology-independent 
devices that communicate as if they are on the same physical Local 
Area Network (LAN). Implementing VLANs on your network has the 
following three advantages:

■

It eases the change and movement of devices on networks. If a 
device in VLAN marketing is moved to a port in another part of the 
network, all you must do is specify that the new port belongs to 
VLAN marketing.

■

It helps to control broadcast traffic. If a device in VLAN marketing 
transmits a broadcast frame, only VLAN marketing devices receive 
the frame.

■

It provides extra security. Devices in VLAN marketing can only 
communicate with devices on VLAN sales using a device that 
provides routing services.

SW3800.BK  Page 4  Tuesday, May 5, 1998  5:20 PM