Whether SDH protection switching is performed during WDM protection switching in a nested protection scenario


If the switching hold-off time is not set for SDH protection, the SDH protection switching is also performed. If the switching hold-off time is set, SDH protection switching is not performed.

Other related questions:
Msp ring switch to protection theroy
After half time slot on the fiber (channel) protection before half time slot on the fiber channel (work), the rearrangement of fault point on both ends of the bridge, through network elements among them, the business flow to traverse the whole ring

Query of the SNCP service configuration and protection switching on WDM devices
Choose <b>Function Tree</b> > <b>Configuration</b> > <b>WDM service management</b> > <b>SNCP service control</b> to query the WDM service configuration and protection switching status.

Switching priority of WDM protection groups
Question: WDM protection includes the following: optical line protection (OLP), client 1+1, intra-board 1+1, ODUk SNCP protection, tributary SNCP protection, and ODUk SPRing protection. There are five types of conditions for triggering protection switching. The switching operations in a descending order of priorities are as follows: Clear switching, locked switching, forced switching, automatic switching, and manual switching. A customer has following questions: 1. A clear switching command has the highest priority. Can it clear SF switching (automatic switching)? 2. What is the effect of a clear switching command when a revertive switching group is in WTR state? 3. What is the effect of a clear switching command when a protection group is in non-revertive switching state? Root cause: None Answer: 1. A clear switching command has the highest priority over external switching commands, and is not issued upon automatic switching. 2. When the system is in the WTR state, a clear switching command can immediately terminate the WTR time to restore services to the working channel. 3. When a protection group is set to the non-revertive mode and both the working and protection channels in the group are normal, services are retained on their channel and are not switched to another channel after a clear switching command is issued.

WDM protection schemes supported by the LEM24 board
The LEM24 board supports the following protection schemes: client 1+1, intra-board 1+1 (on the OLP or DCP board), and OWSP. Note: The LEM24 board supports client 1+1 protection only when EPL services are configured (between PORT and VCTRUNK ports).

Protection objects of LAG protection
Multiple links connected to the same device are aggregated as a link aggregation group (LAG) to increase bandwidth and improve the link reliability. Therefore, LAGs protect Ethernet links.

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