What are the precautions for configuring the cost of a virtual link

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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.

Other related questions:
Precautions of setting the cost of a virtual link on an S series switch
According to RFC, the maximum cost value of a virtual link configured on an S series switch supporting OSPF is 65535. If the cost value is larger than 65535, a virtual link cannot be set up.

The USG configures the OSPF link cost method
The USG2000 & 5000 & 6000 configures the OSPF link cost as follows: 1. Run: system-view The system view is displayed. 2. Run: interface interface-type interface-number The interface view is displayed. 3. Run the ospf cost cost command to set the cost of the OSPF interface. The OSPF protocol cost of the interface is valid for the OSPF route learned from the interface. That is, the cost of the route generated in the device routing table is equal to the cost of the route advertised by the interface. The cost of the interface is set by the ospf cost command.

What precautions should I take when the WLAN dual-link backup solution is deployed
When configuring dual-link backup, set the same heartbeat interval on the active and standby ACs. Additionally, the ACs cannot be used as service gateways, their service configurations must be consistent, and they must use different IP address pools.

Whether virtual TE links must be configured
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).

What are the functions of OSPF virtual links
From the perspective of a protocol, the functions of OSPF virtual links are as follows: Areas not physically connected to the backbone area can be connected to the backbone area through virtual links so that these areas route traffic normally. This function is mainly used to merge networks. Virtual links improve network reliability by allowing for 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 backbone areas are seldom physically disconnected from the backbone areas. It is rare that networks are merged without network re-planning. In addition, on actual networks, virtual links are seldom used to enhance the robustness of backbone areas.

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