Eth-Trunk

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 in the navigation tree to open the Eth-Trunk page.
2. Enter the interface name, for example, 12.
3. Click Query to display all matching records.

Create an Eth-Trunk.

Choose Interface Management > Eth-Trunk > Eth-Trunk in the navigation tree to open the Eth-Trunk page.

Click New to open the Create Eth-Trunk page.

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

**Table 1** Create Eth-Trunk
Parameter	Description
Eth-Trunk Name	Indicates the name of an Eth-Trunk. This parameter is mandatory. NOTE: On the S2700SI switches, the value ranges from 0 to 2. On the S2700EI and S2700EI-52P switches, the value ranges from 0 to 13. On the S3700 and S2710SI-52P switches, the value ranges from 0 to 19. 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.
BPDU	Indicates whether to enable BPDU. The options are Enable and Disable. By default, BPDU is disabled. NOTE: S2700SI, S2700EI, S2710SI-52P ,and S2700EI-52P switches you can configure BPDU on System LACP Priority page.
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, you should 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. Before configuring a static LACP mode, you must enable BPDU.
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.
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.
LACP Timeout	Indicates the timeout period for receiving LACP packets on an interface in static LACP mode: This parameter is valid only when the static LACP mode is enabled. The timeout can be set to 3 seconds for fast mode or 30 seconds for slow mode.
preempt Delay	Indicates whether to enable the preempt delay function in static LACP mode. By default, the preempt delay function is enabled. This parameter is valid only when the static LACP mode is enabled.
Preempt Delay	Specifies the delay for LACP priority preemption. This parameter is valid only when the static LACP mode and preempt delay functions are enabled.
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 length of a Jumbo frame. This parameter is optional. NOTE: The value of the S3700SI and S3700EI switches ranges from 1600 to 13296 seconds. The S2700SI, S2700EI, S2710SI-52P,or S2700EI-52P switches do not support this parameter.
Description	Indicates the description of the created Eth-Trunk.
Select Interface	Adds member interfaces to the Eth-Trunk. An Eth-Trunk contains a maximum of eight member interfaces. NOTE: Member interfaces of an Eth-Trunk must have the same interface type. 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 does not join the Eth-Trunk and is configured by other modules on the Web network management page, the Configure Basic Attributes 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 in the navigation tree to open the Eth-Trunk 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 modules on the Web network management page, excluding Eth-Trunks, the Configure Basic Attributes page is displayed. You can clear the original configurations of this interface.
4. Click OK.
Delete Eth-Trunk
1. Choose Interface Management > Eth-Trunk > Eth-Trunk in the navigation tree to open the Eth-Trunk page.
2. Select a record that you want to delete and click Delete. The system asks you whether to delete the record.
  NOTE:
  - To select a record, click the check box of the record.
  - To delete records in batches, click the check boxes of the records.
3. Click OK. The system displays a message indicating the operation result.
4. Click OK.