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).

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