Allied-telesis AT 8000/8POE User Manual Page 84

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Chapter 6: Port Trunking
84 Section I: Using the Menus Interface
LACP Trunks
An LACP (Link Aggregation Control Protocol) trunk is another type of port
trunk. It performs the same function as a static trunk. It increases the
bandwidth between two network devices by distributing the traffic load
over multiple physical links.
The advantage of an LACP trunk over a static port trunk is its flexibility.
While implementations of static trunking tend to be vendor specific, the
AT-S81 implementation of LACP is compliant with the IEEE 802.3ad
standard. This makes it interoperable with equipment from other vendors
that also comply with the standard. Therefore, you can create a trunk
between an Allied Telesis device and networking devices from other
manufacturers.
LACP Trunk
Status
The AT-8000/8POE Fast Ethernet switch can have up to four trunks. A
maximum of eight ports of each trunk can be assigned by the switch
administrator. You can configure each trunk’s status as Active, Passive,
Manual, or Disabled.
When a trunk is created, its default status is Disabled. This means that the
trunk does not pass network traffic or send/receive LACP data units
(LACPDU) until the trunk status is changed accordingly.
When a trunk is set to Active status, the trunk ports are all available as
part of the active LACP trunk. The trunk ports of an active trunk will all
send and receive LACPDUs. A minimum number of trunk ports
determined by the bandwidth requirements of the network traffic will pass
network traffic. Additional ports within an active trunk will dynamically be
added or deleted by the LACP feature depending on the increase or
decrease of the network traffic.
When a trunk is set to Passive status, the trunk ports are available to be
activated by their link partners. If the trunk receives LACP data unit
packets from an Active link partner, it automatically transitions to an Active
status. The trunk ports will not transmit LACP data units unless the link
partners are in the Active status.
A trunk set to Manual status is effectively a static trunk and has none of
the benefits of the LACP feature. The trunk ports of an active trunk will not
send or receive LACPDUs. The switch administrator must manually add or
delete trunk ports from a trunk.
LACP Port
Priority
Parameter
The switch uses this parameter to determine which ports are to be active
and which are to be in the standby mode in situations where the number of
ports in the aggregate trunk exceeds the highest allowed number of active
ports. This parameter can be adjusted on each port and is a number from
1 to 255. The lower the number, the higher the priority. Ports with the
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