What are some of the challenges in extending OSPF?
Why is IS-IS generally easier to extend than OSPF?
What are Opaque OSPF LSAs?
What are the three types of Opaque LSAs?
What is the benefit of the OSPF Router Information Opaque LSA?
What is the purpose of the IS-IS Protocols Supported TLV?
How is an IGP route tag similar to a BGP community attribute?