13.1. OSPF Extensions for Multi-Topology Routing
At the time of writing of this chapter, the first Internet Draft proposing Multi-Topology OSPF (MT-OSPF) is only a few months old, and MT-OSPF has not yet seen general deployment. By the time you read this, the extensions are likely to be on vendors’ development roadmaps, if not in production code.
 Peter Psenak, Sina Mirtorabi, Abhay Roy, Liem Nguyen, and Padma Pillay-Esnault, “MT-OSPF: Multi-Topology (MT) Routing in OSPF,” draft-ietf-ospf-mt-00.txt, October 2004.
Although some extensions to OSPF have required new LSAs or even a new version of the protocol, MT-OSPF support is implemented simply by exploiting unused fields in modern OSPF LSAs. You might recall from Chapter 5 that OSPF was ...