Illustrated TCP/IP Illustrated TCP/IP
by Matthew G. Naugle
Wiley Computer Publishing, John Wiley & Sons, Inc.
ISBN: 0471196568   Pub Date: 11/01/98  

Previous Table of Contents Next


Chapter 293
MOSPF Caveats

OSPF allows for an autonomous system to be split into areas. Problems may occur when using MOSPF in a multi-area OSPF topology, for the ability of a router to have complete knowledge of the entire autonomous system is lost and incomplete shortest-path trees are built. Multicasts will still get through, but they may take the most efficient paths.

MOSPF Caveats

•  MOSPF only operates effectively in pure OSPF environments, whereas most networks combine:
•  Different IGPs, such as RIP with OSPF
•  IGPs with EGPs, such as BGP-4 with EGPs
•  MOSPF assumes network topology in a multi-area topology.
•  MOSPF is known as a dense-mode multicast protocol.
•  MOSPF can scale to large numbers of multicast groups but it comes at a cost of processing resources.
•  MOSPF has been implemented by a few vendors.
•  No ability to “tunnel” multicast datagrams through nonmulticast routers (MOSPF routers can forward unicast).


Previous Table of Contents Next