Initial establishment of active/standby VSR-NRC roles

The initial establishment of active/standby VSR-NRC roles is as follows:

NRC-P performs up to three attempts at 10-second intervals to establish the global cproto channel to the primary VSR-NRC (for example, VSR-NRC-A in the primary site). If not successful, it performs another three attempts to the secondary VSR-NRC (VSR-NRC-B in primary site). This process is continued cycling among the two VSR-NRCs until the global channel is established to either VSR-NRC-A or VSR-NRC-B, which then becomes the target active VSR-NRC. The cproto channel establishment attempts continue to the other VSR-NRC which becomes the target standby VSR-NRC.
This cproto channel establishment process is also followed when the global cproto channel to the active VSR-NRC goes down beginning always with an attempt to the primary VSR-NRC (VSR-NRC-A) and then onto the secondary VSR-NRC (VSR-NRC-B) and continues cycling between them until a channel is established.
At successful global cproto channel establishment, the NRC-P sends a notify message (wscIsActive=TRUE, mateAddr, matePort) requesting a transition to active role from the VSR-NRC (VSR-NRC-A or VSR-NRC-B).
When NRC-P also established the TOPO and PCEP cproto channels, the active VSR-NRC begins the partial database synchronization procedures to NRC-P, as mentioned in TE-DB and LSP-DB partial synchronization.
When the reconcile process is complete, the active VSR-NRC acknowledges the NRC-P by sending a notify reply message (notifyReply=TRUE).
The active VSR-NRC attempts to establish a cproto sync channel to the mate VSR-NRC. After it is successfully established, it begins the full or partial database synchronization procedures to the mate VSR-NRC following the procedures, as mentioned in TE-DB and LSP-DB partial synchronization.
After the global cproto channel to the target standby VSR-NRC is established, NRC-P sends a notify message (wscIsActive=FALSE, mateAddr, matePort) requesting transition to a standby role. The target standby VSR-NRC acknowledges by sending a notify reply message (notifyReply=TRUE). No database synchronization occurs between the standby VSR-NRC and the NRC-P.
The standby VSR-NRC maintains a copy of the mate active VSR-NRC database and independently builds its own database using BGP-LS and PCEP peerings with the network.
When the active and standby roles have been assigned by the NRC-P, the primary and secondary VSR-NRCs keep that role until further notice from NRC-P. The roles are not affected by the state of the cproto sync channel.