How to implement L2 VSI?

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As an Multiprotocol Label Switching (MPLS)-based point-to-multipoint (P2MP) Layer 2 Virtual Private Network (L2VPN) service provided over a public network, the virtual private LAN service (VPLS) ensures that geographically isolated user sites can communicate over metropolitan area networks (MANs) and wide area networks (WANs) as if they were on the same local area network (LAN). VPLS is also called the Transparent LAN Service (TLS).
Configuration Examples, For details, see: Example for Configuring Martini VPLS.

Other related questions:
how did S switch isolate L2 traffic ?
S Switch can implement layer 2 isolation through traffic policy and port isolation.please refer http://support.huawei.com/ehedex/hdx.do?lib=DOC100000847031185721&docid=DOC1000008470&v=05&tocLib=DOC100000847031185721&tocV=05&id=dc_s_web_090157&tocURL=resources%252fs%252fdc%255fs%255fweb%255f090157%255fx7%252ehtml&p=t&fe=1&ui=3&keyword=isol&clientWidth=1325&browseTime=1490106452862

How does an S series switch process UDP packets when it functions as a Layer 2 switch
If an S series switch (except the S1700) functions as a Layer 2 switch, it does not identify UDP or TCP packets by default. The switch only forwards packets based on its original MAC address table.

Working principle of BFD for IS-IS on S Series switches
Q: What is the working principle of BFD for IS-IS? A: Bidirectional Forwarding Detection (BFD) is a simple hello protocol and similar to the Hello protocol of IS-IS in many aspects. Two systems periodically send BFD detection packets on the session channel between them. If one system does not receive any BFD detection packet from its peer within a certain period of time, the system considers that the bidirectional channel to the neighboring system is faulty. IS-IS, in conjunction with BFD, can fast detect neighboring status. In this manner, IS-IS devices can fast converge routes.

How can I configure selective QinQ on CE switches
Selective QinQ is also called VLAN stacking. It adds different outer tags to the frames received on a Layer 2 QinQ interface according to different inner tags or the frames matching traffic classification rules. This function enables refined management of users and services. # Configure selective QinQ on 10GE1/0/1 and add VLAN 100 in the outer tag to the tagged frames with the VLAN range of 10 to 13. 
system-view
[~HUAWEI] vlan batch 10 to 13 100
[*HUAWEI] interface 10ge 1/0/1
[*HUAWEI-10GE1/0/1] port link-type hybrid
[*HUAWEI-10GE1/0/1] port hybrid untagged vlan 100 [*HUAWEI-10GE1/0/1] port vlan-stacking vlan 10 to 13 stack-vlan 100
[*HUAWEI-10GE1/0/1] commit
Description: - Selective QinQ can be enabled only on hybrid and trunk interfaces and applied to incoming packets. - The outer VLAN ID must exist and the interface must be added to the stack VLAN in untagged mode. - If the port vlan-stacking command with VLAN ranges specified has been executed for three or more times and VLAN ranges are combined twice at least, the configuration of each command must be committed. Otherwise, packets may be lost. For example, when port vlan-stacking vlan 30 to 60 stack-vlan 100, port vlan-stacking vlan 20 to 30 stack-vlan 100, and port vlan-stacking vlan 60 to 70 stack-vlan 100 commands are executed, VLAN ranges 20 to 60 and 20 to 70 are combined twice. Therefore, commit each command configuration.

Whether OSN 9800 supports L2 functions
V100R001C00 of OSN 9800 does not support L2 functions, whereas V100R001C00 does.

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