Allied Telesis AT-S39 - Manual (Page 73)

AT-S39 User’s Guide
73
Port Trunking Overview
Port trunking is an economical way for you to increase the bandwidth
between two switches. A port trunk is 2, 3, or 4 ports that have been
grouped together to function as one logical path. A port trunk increases
the bandwidth between switches and is useful in situations where a
single physical data link between switches is insufficient to handle the
traffic load.
Despite the software configuration and physical connections, there are
no data loops in aggregated links because of load balancing. The port
trunk always sends packets from a particular source to a particular
destination over the same link within the trunk. A single link is
designated for flooding broadcasts and packets of unknown destination.
The example in Figure 19 consists of a port trunk of four data links
between two AT-8024 switches.
Figure 19 Port Trunk Example 2
Observe the following guidelines when creating a port trunk:
❑ The AT-8024, AT-8024GB, and AT-8026FC Fast Ethernet Switches
can support only one port trunk at a time.
❑ A port trunk can consist of 2, 3, or 4 ports.
❑ The ports of a port trunk must be of the same medium type. For
example, they can be all twisted pair ports or all fiber optic ports.
❑ The speed, duplex mode, and flow control settings must be the
same for all the ports in a trunk.
❑ The ports of a port trunk must be members of the same VLAN. A
port trunk cannot consist of ports from different VLANs.
Link
Mode
Link
Mode
100
FULL
ACT
MODE
COL
FAULT
MASTER
PWR
AT-8024
10Base-T / 100Base-TX Fast Ethernet Switch RS-232 TERMINAL PORT
Link
Mode
Link
Mode
100
FULL
ACT
MODE
COL
FAULT
MASTER
PWR
AT-8024
10Base-T / 100Base-TX Fast Ethernet Switch RS-232 TERMINAL PORT