Which of the following statements about LDP-IGP synchronization are true?
Select all that apply.
A
The LDP-IGP synchronization means to postpone the route switchback until LDP completes convergence by suppressing the establishment of IGP neighbor relationships or setting the cost of route advertisement to the largest value.
B
The LDP-IGP synchronization involves three timers: Hold-down, Hold-max-cost, and Syncachieved.
C
The LDP and IGP synchronization involves four states: Init, Hold-down, Hold-max-cost, and Syncachieved.
D
The LDP and IGP synchronization helps shorten the time for switching traffic from the standby link back to the active link and the switchback can be complete within several milliseconds.