Allied Telesis AT-S62 - Manual (Page 130)

Chapter 8: Port Trunking
Section I: Basic Operations 130
❑ Only those ports that are members of an aggregator transmit
LACPDU packets.
❑ The load distribution method is applied at the aggregator level. If
you want aggregate trunks to have different load distribution
methods, you must create a separate aggregator for each trunk.
For further information, refer to Load Distribution Methods on
page 130.
❑ A port that is a member 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.
❑ The port with the highest priority in an aggregate trunk carries
broadcast packets and packets with an unknown destination.
❑ Prior to creating an aggregate trunk between an AT-8500 Series
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-8500 Series switch, you
should probably assign it a higher system LACP priority than the
AT-8500 Series switch. If it is more than eight, assign the AT-8500
Series switch the higher priority. This can help avoid a possible
conflict between the devices if some ports are placed in the
standby mode when the trunk is created by the devices. For
background information, refer to LACP System Priority on page
127.
❑ LACPDU packets are transmitted as untagged packets.
Load Distribution
Methods
This section discusses the load distribution methods and applies to both
static and LACP port trunks.
One of the steps to creating a static or LACP port trunk is the selection of
a load distribution method. This step determines how the switch
distributes the traffic load across the ports in the trunk. The AT-S62
management software offers the following load distribution methods:
❑ Source MAC Address (Layer 2)
❑ Destination MAC Address (Layer 2)
❑ Source MAC Address / Destination MAC Address (Layer 2)
❑ Source IP Address (Layer 3)
❑ Destination IP Address (Layer 3)