Principles of the Layer 2 interoperation feature

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QinQ service deployment requires that users be interconnected at Layer 2. However, users connected to the same access device are isolated from each other at this layer. This restricts that QinQ services can be deployed only between different access devices.
In addition, when users connected to the same access device in the same IP network segment exchange data, the upper-layer device needs to forward data at Layer 3 and must support Address Resolution Protocol (ARP) proxy. This promotes the requirements on the upper-layer device. The Layer 2 interoperation feature can solve this problem.
For more information, visit Huawei technical support website.

Other related questions:
How can I check whether a loop exists on an S series switch
The simplest way to check the existence of a loop on an S series switch (except the S1700) is to check whether a MAC address flapping alarm exists on the switch. If the alarm exists, you can quickly locate the loop based on the information in the alarm. Run the display mac-address flapping record command to check whether MAC address flapping exists, or run the display trapbuffer command to check whether the alarm contains The mac-address has flap value or MAC move detected. For more information, visit Layer 2 Loop Troubleshooting.

How to determine whether an S series switch is a Layer 2 or Layer 3 switch
All models of the S600, S1720, and S2700 are Layer 2 switches. All models of the S3700 and S6700 are Layer 3 switches. The S5700-LI, S5700S-LI, S5710-LI, S5720-LI, and S5720S-LI series are Layer 2 switches. The S5700-EI, S5700-SI, and S5700-HI series are Layer 3 switches. All models of the S9300, S7700, S9700, and S12700 are Layer 3 switches.

S1720 overview
Introduction to S1720: The S1720 series switches are next-generation energy-saving gigabit Layer 2 Ethernet switches that support configuration of up to eight VLANIF interfaces. The series switches are equipped with console ports and can be managed and maintained using SNMP, command line interface (CLI), web-based network management system, Telnet, or Secure Shell (SSH) V2.0.

Configuring Layer 2/Layer 3 switchover on the firewall
Perform as follows to configure Layer 2/Layer 3 interface switching on the USG2000&5000&6000: system-view [USG] interface GigabitEthernet 1/0/1 [USG-GigabitEthernet1/0/1] undo portswitch //Switch the interface from Layer 2 mode to Layer 3 mode. [USG-GigabitEthernet1/0/1] portswitch //Switch the interface from Layer 3 to Layer 2. Note: 1. If the device interface attribute specifies that the interface is a Layer 2 interface, the interface cannot be switched to Layer 3 mode. This command applies only to interfaces that support Layer 2/Layer 3 switching. 2. When you use this command to perform Layer 2/Layer 3 mode switching, the interface can contain only the attribute information (such as shutdown and description configurations) so that the mode switching can take effect. If the interface already has service configurations (such as port link-type trunk), clear all these configurations of the interface and then run this command.

OceanStor interoperability navigator
OceanStor interoperability navigator: http://support-open.huawei.com/ready/pages/user/compatibility/support-matrix.jsf

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