Eth-Trunk Interface

An Eth-Trunk load balances incoming and outgoing traffic among multiple links and improves the bandwidth and connection reliability between two switches.

Context

You can configure Eth-Trunks in the following scenarios:

The bandwidth is insufficient when two switches are connected through only one link.
The connection reliability cannot meet requirement when two switches are connected through only one link.

Procedure

Query Eth-Trunk information.
1. Choose Interface Management > Eth-Trunk > Eth-Trunk Interface in the navigation tree, and the Eth-Trunk Interface page is displayed
2. Enter the interface name, for example, 10.
3. Click Query to display all matching records.

Create an Eth-Trunk.

Choose Interface Management > Eth-Trunk > Eth-Trunk Interface in the navigation tree, and the Eth-Trunk Interface page is displayed.

Click Create, and the Create Eth-Trunk page is displayed.

Table 1 describes the parameters on the Create Eth-Trunk page.

**Table 1** Eth-Trunk
Parameter	Description
Eth-Trunk name	Indicates the name of an Eth-Trunk. This parameter is mandatory. NOTE: After creating an Eth-Trunk, you can create another Eth-Trunk on the same Create Eth-Trunk page. Enter an Eth-Trunk name and click anywhere on the page. Set parameters of the new Eth-Trunk after the page is refreshed. The value is an integer that ranges from 0 to 127. If the device is equipped with cards specified in the assign trunk command, you can run the assign trunk command to set the maximum number of LAGs and the maximum number of member interfaces in each LAG and run the display trunk configuration command to view the configuration.
Working mode	Indicates the working mode of the Eth-Trunk, including: Manual load balancing mode When the bandwidth or the reliability between two devices needs to be increased and one device does not support LACP, create an Eth-Trunk in manual load balancing mode and add member interfaces to the Eth-Trunk. Static LACP mode The links between two devices can implement redundancy backup. When a fault occurs on some links, the backup links replace the faulty ones to keep data transmission uninterrupted. The default mode is manual load balancing. NOTE: Check whether the Eth-Trunk contains member interfaces before you set the working mode of the Eth-Trunk. If the Eth-Trunk contains member interfaces, the working mode of the Eth-Trunk cannot be changed. The working modes on the local end and remote end must be the same.
Min active links	Indicates the lower threshold of the number of active interfaces. You can specify the lower threshold of active interfaces in the Eth-Trunk. If the number of active interfaces is smaller than this value, the status of the Eth-Trunk becomes Down. NOTE: The lower threshold must be not greater than the upper threshold. The lower thresholds of active member interfaces can be set to different values for the local end and remote end. If the lower thresholds at the two ends are different, the greater one is used. If the device is equipped with cards specified in the assign trunk command, you can run the assign trunk command to set the maximum number of LAGs and the maximum number of member interfaces in each LAG and run the display trunk configuration command to view the configuration.
Max active links	Indicates the upper threshold of the number of active interfaces. NOTE: The lower threshold must be not greater than the upper threshold. The upper thresholds of active member interfaces can be set to different values for the local end and remote end. If the upper thresholds at the two ends are different, the smaller one is used. In manual load balancing mode, this parameter has a fixed value 8. If the device is equipped with cards specified in the assign trunk command, you can run the assign trunk command to set the maximum number of LAGs and the maximum number of member interfaces in each LAG and run the display trunk configuration command to view the configuration.
Load balancing mode	Indicates the load balancing mode of Eth-Trunk, including: Destination IP Destination MAC Source IP Exclusive-OR of source and destination IP Source MAC Exclusive-OR of source and destination MAC By default, load balancing is based on the "Exclusive-OR" result of the source and destination IP addresses.
Link type	Indicates the link type of an interface. The value cannot be changed.
Jumbo	Indicates the maximum length of a jumbo frame. If you do not enter any value, the default value is used.
Description	Indicates the description of the created Eth-Trunk.
Select Interface	Adds member interfaces to the Eth-Trunk. When you select an interface, the selected interfaces are displayed in the list of interface names. NOTE: The member interfaces of an Eth-Trunk must be of the same type, that is, Ethernet interfaces and GigabitEthernet interfaces cannot be added to the same Eth-Trunk. A member interface cannot be an Eth-Trunk.

Set parameters.
When selecting the interface:
- If this interface is configured by other Eth-Trunks, it is unavailable and cannot be selected.
- If this interface is not configured, you can select it.
- If this interface is configured by other modules except shutdown and combo, the Interface Configuration Information page is displayed. You can clear the original configurations of this interface.
Click OK.

Modify Eth-Trunk
1. Choose Interface Management > Eth-Trunk > Eth-Trunk Interface in the navigation tree to open the Eth-Trunk Interface page.
2. Select a record that you want to modify and click to open the Modify Eth-Trunk page.
  Table 1 describes the parameters on the Modify Eth-Trunk page.
  NOTE:
  - The Eth-Trunk name cannot be modified.
  - Before changing the working mode of an Eth-Trunk, ensure that the Eth-Trunk does not contain any member interfaces.
3. Set parameters.
  When selecting the interface:
  - If this interface is configured by other Eth-Trunks, it is unavailable and cannot be selected.
  - If this interface is not configured, you can select it.
  - If this interface is configured by other modules except shutdown and combo, the Interface Configuration Information page is displayed. You can clear the original configurations of this interface.
4. Click OK.
Delete Eth-Trunks.
1. Choose Interface Management > Eth-Trunk > Eth-Trunk Interface in the navigation tree to open the Eth-Trunk Interface page.
2. Select a record that you want to delete and click Delete. The system asks you whether to delete the record.
3. Click OK.
  NOTE:
  An Eth-Trunk cannot be deleted when it has member interfaces.