Nuts and Bolts
Media support
- Both protocols support LANs and point-to-point links in similar ways
- IS-IS has no direct NBMA support--expects O/S to present NBMA network as either pseudo-LAN (bad idea) or set of point-to-point links
- OSPF NBMA mode is configuration-heavy and risky (all routers must be able to reach DR; bad news if VC fails)
- OSPF P2MP mode models NBMA as point-to-point links (if O/S wonÅft help)