Question: How to create an OSPF stub router using STC?
Answer: As per RFC2328; The Hello packet's Options field describes the router's optional OSPF capabilities. One optional capability is defined in this specification (see Sections 4.5 and A.2).
The E-bit of the Options field should be set if and only if the attached area is capable of processing AS-external-LSAs (i.e., it is not a stub area).
If the E-bit is set incorrectly the neighboring routers will refuse to accept the Hello Packet
We can clear the E-Bit in STC device to make it act as a stub router.