The Customer X network consists of an MPLS core, IS-IS running as IGP, a pair of BGP route reflectors for route propagation, and a few dozens of MPLS-TE tunnels for specific tactical traffic engineering requirements. The customer engineering department has some questions about the use of the Overload Bit in the IS-IS networks and how it could be used to improve their current network design. Which three options about the Overload Bit are true? (Choose three.)
A. It is not recommended on BGP route reflectors.
B. It only affects the use of the respective node as a transit node, and networks advertised within the LSPs of the node are still reachable.
C. It can be set on a router during the startup process for a fixed period of time.
D. It forces the midpoint MPLS-TE node to reoptimize the primary tunnels going through the OL node.
E. It can be set on a router until other interacting protocols have signaled convergence.
