Extensions to OSPFv2 for Advertising Optional Route/Link Attributes
There are applications which require additional attributes to be advertised with an OSPF link or route. The existing OSPF LSA formats do not allow for backward compatible extension to advertise these attributes. This draft proposes an extension to OSPF for advertising additional attributes which will be associated with a link or route. It also introduces the support of administrative tags for any link type in the router-LSA and any route in summary-LSAs, NSSA-LSAs, or AS-external-LSAs.