АМАТЕК AN-SGM28P24-400 [62/322] Configuring trunk

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3.7 Configuring TRUNK

TRUNK is the integration of multiple ports into a logical port, which can be used to increase

bandwidth, provide redundant backup connections, and can also be used for load balancing。When

the TRUNK group is used as the output logic port, the switch will send a packet from the port

group by selecting a port according to the aggregation policy set by the user。The configuration of

port and aggregation strategy in TRUNK group is completed by software, but the forwarding of

data stream is accomplished by hardware。

All ports in the TRUNK group must be configured at the same speed, and in full duplex

mode。switches can support up to 8 groups of TRUNK, each group of TRUNK members up to 8。

Special attention should be paid to that each port can only belong to a TRUNK group。

LACP protocol is a protocol based on IEEE802.3ad standard。LACP protocol interacts with

the client via LACPDU (Link Aggregation Control Protocol Data Unit)。

The interface in the aggregation group enables the LACP protocol. The interface advertises

the LACP protocol priority, the system MAC address, the LACP priority of the port, the port

number, and the operation key to the peer through the LACPDU. After receiving the LACPDU,

the peer compares the information with the information received by other interfaces to select the

interface that can be in the selected state, so that the two parties can agree on the interface in the

selected state。

The operation key is a configuration combination that is automatically generated according to

some configurations of member ports during link aggregation. It includes port rate, duplex mode,

up / down status, VLANs allowed on port, VLAN default VLAN ID , The link type of the port

(that is, Trunk, Hybrid, Access type) and so on. In the aggregation group, the member ports in the

selected state have the same operation Key。

This section gives a detailed description of the configuration of TRUNK, including the

following：

 LACP protocol configuration

 Configuration of TRUNK group

 TRUNK group member port configuration

 TRUNK load balancing policy configuration

 Display of TRUNK

3.7.1 LACP protocol configuration