Allied Telesis AT-S63 - Manual (Page 90)

Chapter 6: LACP Port Trunks
90 Section I: Basic Operations
Guidelines
The following guidelines apply to creating aggregators:
ˆ LACP must be activated on both the switch and the other device.
ˆ The other device must be 802.3ad-compliant.
ˆ An aggregator can consist of any number of ports.
ˆ The AT-S63 Management Software supports up to eight active ports in
an aggregate trunk at a time.
ˆ The AT-9400 Switch can support up to six static and LACP aggregate
trunks at a time (for example, four static trunks and two LACP trunks).
An LACP trunk is countered against the maximum number of trunks
only when it is active.
ˆ The ports of an aggregate trunk must be the same medium type: all
twisted pair ports or all fiber optic ports.
ˆ The ports of a trunk can be consecutive (for example ports 5-9) or
nonconsecutive (for example, ports 4, 8, 11, 20).
ˆ A port can belong to only one aggregator at a time.
ˆ A port cannot be a member of an aggregator and a static trunk at the
same time.
ˆ The ports of an aggregate trunk must be untagged members of the
same VLAN.
ˆ 10/100/1000Base-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 an aggregate trunk of transceivers with 1000Base-X
fiber optic ports.
ˆ Only those ports that are members of an aggregator transmit LACPDU
packets.
ˆ The load distribution method is applied at the aggregator level. To
assign different load distribution methods to aggregate trunks, you
must create a separate aggregator for each trunk. For further
information, refer to “Load Distribution Methods” on page 78.
ˆ A member port of an aggregator 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 an aggregate trunk carries
broadcast packets and packets with an unknown destination.