For an Eth-Trunk working in LACP mode on an S series switch, can I configure a member interface in unselect state through negotiation with the peer end

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For an Eth-Trunk that works in LACP mode on an S series switch (except the S1700), you can configure its member interface in unselect state through negotiation with the peer end. You can run the display eth-trunk command to check configuration of the Eth-Trunk.

Other related questions:
How do I configure link aggregation in LACP mode on S series switches
Configure link aggregation in LACP mode on S series switches (except the S1700) as follows: # Create Eth-Trunk 1 on a switch and configure Eth-Trunk 1 to work in LACP mode. [HUAWEI] interface eth-trunk 1 [HUAWEI-Eth-Trunk1] mode lacp [HUAWEI-Eth-Trunk1] quit

The type of Eth-Trunk member interfaces on S series switches
Observe the following guidelines when adding member interface to an Eth-Trunk on S series switches (except the S1700): 1. The member interface cannot be configured with some services or static MAC address entries. For example, when an interface is added to an Eth-Trunk, the interface must use the default link type. 2. An Eth-Trunk cannot be added to another Eth-Trunk. Member interfaces of an Eth-Trunk must use the same Ethernet type and rate. Interfaces that use different Ethernet types and rates cannot join the same Eth-Trunk. For instance, GE interfaces and FE interfaces cannot join the same Eth-Trunk, but GE electrical interfaces and GE optical interfaces can join the same Eth-Trunk. 3. Both devices of the Eth-Trunk must use the same number of physical interfaces, interface rate, duplex mode, and flow control mode. 4. If an interface of the local device is added to an Eth-Trunk, an interface of the remote device directly connected to the interface of the local device must also be added to an Eth-Trunk; otherwise, the two ends cannot communicate.

How to determine active interfaces among member interfaces of an Eth-Trunk in LACP mode
When the status of member interfaces of an Eth-Trunk is different, the switch determines active interfaces according to interface priorities. Check LACP priorities of member interfaces on the Actor. A smaller LACP priority indicates a higher priority of the member interface. By default, LACP priorities of member interfaces are 32768. If member interfaces have the same LACP priority, check interface numbers of member interface. A smaller interface number indicates a higher priority of the member interface.

How do I configure an Eth-Trunk on an S series switch and allow packets of certain VLANs to pass through
For S series switches (except the S1700), to allow an Eth-Trunk to transparently transmit packets from multiple VLANs, you can configure the link type of the interface as Trunk or Hybrid. The following example configures an Eth-Trunk in LACP mode and sets the link type of the interface to Trunk so that the interface can transparently transmit packets from multiple VLANs: 1. Create Eth-Trunk 1 on the switch and configure Eth-Trunk 1 to work in LACP mode. [HUAWEI] interface eth-trunk 1 [HUAWEI-Eth-Trunk1] mode lacp 2. Configure Eth-Trunk 1 to allow packets from VLANs 10 to 100 to pass through. [HUAWEI-Eth-Trunk1] port link-type trunk [HUAWEI-Eth-Trunk1] port trunk allow-pass vlan 10 to 100

Number allocation of Eth-Trunk member interfaces on stacked S series switches
After you configure an Eth-Trunk on stacked S series switches (except the S1700), the member interface number remain unchanged even if you split the stack and stack the switches again.

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