You configured a Fail-Safe Network (FSN) using two devices connected to two different switches.
What is an important issue to confirm with the customer’s switch configuration?
A.
All the switch ports of the FSN must be configured to immediately switch from forwarding mode to blocking mode and pass through spanning tree states
B.
All the switch ports of the FSN must be configured to immediately switch from forwarding mode to blocking mode and not pass through spanning tree states
C.
If these are Cisco switches, the portfast capability must be disabled for each of the ports of the FSN
D.
All the switch ports of the FSN must be configured to immediately switch from blocking mode to forwarding mode and not pass through spanning tree states