Traffic is not passing through ETH trunk in LAG configuration?

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STP is enabled by default, check the ports status to see if they are blocked.

Other related questions:
Traffic is not forwarded through all member interfaces of an Eth-Trunk in a stack. Why
When a stack device forwards traffic, an Eth-Trunk may select a member interface of another stack device through the hash algorithm, which occupies bandwidth resources between stack devices and reduces the traffic forwarding efficiency. To address the preceding problem, run the local-preference enable command to enable the Eth-Trunk to preferentially forward local traffic. That is, traffic arriving at the local device is preferentially forwarded through member interfaces of the local device. If the local device has no member interface, the member interface of another stack device is used to forward traffic. This saves bandwidth resources between stack devices and improves the traffic forwarding efficiency. By default, an Eth-Trunk is enabled to preferentially forward local traffic. Before configuring an Eth-Trunk to preferentially forward local traffic, ensure that the outbound bandwidth of Eth-Trunk member interfaces is sufficient for forwarding local traffic. If the outbound interface bandwidth is insufficient, some packets are dropped.

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

How is uneven load balancing of an Eth-Trunk solved on CE switches
Load balancing modes in different service scenarios are different. If load balancing of an Eth-Trunk is uneven, it is generally caused by the inappropriate load balancing mode. Perform the following operations to solve the problem: 1. Check whether the number of Eth-Trunk member interfaces is the nth power of 2. If not, adjust the number of Eth-Trunk member interfaces to the nth power of 2. 2. Adjust the load balancing mode. If the IP address in packets changes frequently, use load balancing based on the source or destination IP address so that traffic can be evenly load balanced among physical links. If the MAC address in packets changes frequently and the IP address is fixed, use load balancing based on the source or destination MAC address so that traffic can be evenly load balanced among physical links. If packets are random, you are advised to add the hash factor. 3. Adjust the hash algorithm. CE7800&CE6800&CE5800 series switches: eth-trunk { hash-mode hash-mode-id | universal-id universal-id } * CE12800 series switches: eth-trunk { src-interface | seed seed-data | universal-id universal-id | hash-mode hash-mode-id } * Note: The load balancing mode is valid only for the outbound interface of traffic. If traffic of the inbound interface is uneven, change the load balancing mode of the outbound interface on the uplink device. In the scenario where Eth-Trunk and ECMP are deployed and traffic is unevenly load balanced, configure different hash algorithms for the Eth-Trunk and ECMP and change the value of universal-id as needed.

Why does traffic forwarding fail when the switch is connected to another device through an Eth-Trunk
After an Eth-Trunk is configured on the switch, the manual load balancing mode is adopted on the Eth-Trunk by default. If the device connected to the switch uses the static LACP mode after link aggregation is configured, the two devices use different working modes at two ends of the Eth-Trunk. As a result, traffic cannot be transmitted on the Eth-Trunk. To ensure traffic transmission on the Eth-Trunk, you need to set the same working mode on the two devices.

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