Allied Telesis AT-S60 - Manual (Page 113)

Chapter 8: Port Trunking
Section II: Local and Telnet Management 112
❑ For 10/100 port trunks, such as those on an AT-8411 TX line card,
all ports included in the trunk must reside on the same line card.
See Figure 35 on page 111 for an illustration of a 10/100 Mbps port
trunk.
❑ For 1,000 Mbps port trunks, such as those on an AT-8413 line card,
all ports included in the trunk must reside on different line cards.
Generally, there is one 1,000 Mbps port per line card as with the
AT-8413 line card. See Figure 34 on page 110 for an illustration of
a 1,000 Mbps port trunk.
❑ Although each AT-8413 line card contains two ports, only one
port can be active at a time. Each AT-8413 line card can forward
traffic on either the twisted pair or fiber optic port. When creating
a port trunk with AT-8413 line cards, the trunked ports must be
made up of either twisted pair or fiber optic ports.
❑ The speed, duplex mode, and flow control settings must be the
same for all the ports in a trunk. In addition, the broadcast filter,
override priority, HOL blocking, back pressure, MDI/MDIX, and
negotiation 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.
❑ The ports of a port trunk must all have the same security setting.
❑ When cabling a trunk, the order of the connections should be
maintained on both nodes. The lowest numbered port in a trunk
on the switch should be connected to the lowest numbered port
of the trunk on the other device, the next lowest numbered port
on the switch should be connected to the next lowest numbered
port on the other device, and so on.
For example, assume that you are connecting a trunk between
two AT-8400 switches. On the first AT-8400 switch you chose
ports 1.2, 1.3, 1.4, 1.5 for the trunk. On the second AT-8400
switch you chose ports 2.1, 2.2, 2.3, and 2.4. To maintain the
order of the port connections, you would connect port 1.2 on
the first AT-8400 switch to port 2.1 on the second AT-8400
switch, port 1.3 to port 2.2, and so on.
❑ You can create a port trunk using the fiber optic ports in an
AT-8412/SC FX line card.