Whether virtual TE links must be configured

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Virtual TE links need to be created only in specific scenarios.
1. When optical NEs and electrical NEs are separate from each other, a virtual TE link needs to be created between an optical NE and an electrical NE. When an ultra-long span uses an ESC instead of an OSC (for optical-layer ASON only), a virtual TE link needs to be created between NEs at the two ends of the span. When ASON links pass through a traditional NE, virtual TE links need to be created between the traditional NE and ASON NEs.
2. When optical NEs and electrical NEs are separate from each other on an optical-layer ASON network, virtual TE links must be manually configured for OSN 6800/8800 of a version earlier than V100R007C02. Version V100R007C02 and later version support automatic discovery of virtual TE links (this function can be disabled if desired).

Other related questions:
Must DAD be configured
DAD is optional. However, to detect a dual-master condition after a stack splits, it is recommended that DAD be configured after a stack is set up.

What are the precautions for configuring the cost of a virtual link
Ensure that the cost is not greater than the maximum value, that is 65535, defined in the related RFC. Otherwise, no virtual link can be established.

Whether the two ends of a WDM link must have the same service type
Yes, the two ends of a WDM link must have the same service type.

Relationships between data links and TE links
For ASON services, data links are member links displayed on the NMS. Member links are considered as small bandwidth units of a TE link. A TE link can consist of multiple member links. In the ASON software of the current version, a TE link contains only one member link. TE links are flooded to the entire network based on the OSPF protocol. Each ASON NE stores network-wide TE link information. Member links are not flooded to the entire network. Each ASON NE manages and stores only its own member links.

Why configure OSPF virtual links on S series switches
Question: What are the functions of OSPF virtual links configured on S series switch supporting OSPF? Answer: OSPF virtual links can connect areas that are not physically connected to the backbone area to the backbone area so that these areas can route traffic normally. This function is mainly used to merge networks. Virtual links also improve network reliability by allowing normal routing after the physical connection to the backbone area is down. On actual networks, virtual links are seldom used. Generally, networks are planned properly and areas are seldom physically disconnected from the backbone areas. It is rare that networks are merged without network re-planning. In addition, virtual links are seldom used to enhance the robustness of backbone areas.

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