Allied Telesis AT-S63 - Manual (Page 156)

Chapter 8: Static and LACP Port Trunks
156 Section I: Basic Features
ˆ When creating a new aggregator, you can specify either a name for
the aggregator or an adminkey, but not both. If you specify a name, the
adminkey is based on the operator key of the lowest numbered port in
the aggregator. If you specify an adminkey, the default name is
DEFAULT_AGG followed by the port number of the lowest numbered
port in the aggregator. For example, an aggregator of ports 12 to 16 is
given the default name DEFAULT_AGG12.
ˆ Prior to creating an aggregate trunk between an AT-9400 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-9400 Series switch, you should probably
assign it a higher system LACP priority than the AT-9400 Series
switch. If it is more than eight, assign the AT-9400 Series switch the
higher priority. 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 System Priority”
on page 153.
ˆ 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-S63 management
software offers the following load distribution methods:
ˆ Source MAC Address (Layer 2)
ˆ Destination MAC Address (Layer 2)
ˆ Source MAC Address / Destination MAC Address (Layer 2)
ˆ Source IP Address (Layer 3)
ˆ Destination IP Address (Layer 3)
ˆ Source IP Address / Destination IP Address (Layer 3)
The load distribution methods examine the last three bits of a packet’s
MAC or IP address and compare the bits against mappings assigned to
the ports in the trunk. The port mapped to the matching bits is selected as
the transmission port for the packet.
In cases where you select a load distribution that employs either a source
or destination address but not both, only the last three bits of the
designated address are used in selecting a transmission port in a trunk. If
you select one of the two load distribution methods that employs both
source and destination addresses, port selection is achieved through an
XOR operation of the last three bits of both addresses.