Allied Telesis AT-S81 - Manual (Page 86)

Chapter 6: Port Trunking
86 Section I: Using the Menus Interface
ˆ An LACP trunk does not forward VLAN ID information.
ˆ 10/100Base-TX twisted pair ports must be set to Auto-Negotiation or
100 Mbps, full-duplex mode. LACP trunking is not supported in half-
duplex mode.
ˆ 100Base-FX fiber optic ports must be set to full-duplex mode.
ˆ You can create a trunk group that includes transceivers with
1000Base-X fiber optic ports.
ˆ Only those ports that are members of a trunk group transmit LACPDU
packets.
ˆ A port that is a member of a trunk group functions as part of an
aggregate trunk only if it receives LACPDU packets from the remote
device. If it does not receive LACPDU packets, it functions as a regular
Ethernet port, forwarding network traffic while also continuing to
transmit LACPDU packets.
ˆ The port with the highest priority in a trunk group carries broadcast
packets and packets with an unknown destination. For background
information, refer to “LACP Port Priority Parameter” on page 84.
ˆ Prior to creating a trunk group between an AT-8000/8POE Fast
Ethernet switch and another vendor’s device, refer to the vendor’s
documentation to determine the maximum number of active ports the
device can support in a trunk. If the number is less than eight, the
maximum number for the AT-8000/8POE Fast Ethernet switch, you
should probably assign a higher system LACP priority to the other
vendor’s switch. If it is more than eight, assign the higher priority to the
AT-8000/8POE Fast Ethernet switch. This can avoid a possible conflict
between the devices if some ports are placed in the standby mode
when the devices create the trunk. For background information, refer
to “LACP Port Priority Parameter” on page 84.
ˆ LACPDU packets are transmitted as untagged packets.