different link metrics to different (groups of) VCs allows for
greater efficiency in using FR resources since VCs with better
performance characteristics (throughput, delay) could be assigned
lower link metrics.
5. Conclusion
We have specified guidelines for OSPF implementors and users to bring
about improvements in how the protocol runs over frame relay
networks. These recommendations do not require any protocol changes
and allow for simpler, more efficient and cost-effective network
designs. We recommend that OSPF implementations be able to support
logical interfaces, each consisting of one or more virtual circuits
and used as numbered logical point-to-point links (one VC) or logical
NBMA networks (more than one VC). The current NBMA model for frame
relay should continue to be used for small homogeneous networks
consisting of a few routers.
6. References
[1] Bradley, T., Brown, C., and A. Malis, "Multiprotocol Interconnect
over Frame Relay", RFC1294, Wellfleet Communications, Inc., BBN
Communications, January 1992.
[2] Moy, J., "OSPF Version 2", RFC1583, Proteon, Inc., March 1994.
[3] McCloghrie, K., and M. Rose, Editors, "Management Information
Base for Network Management of TCP/IP-based Internets: MIB-II",
STD 17, RFC1213, Hughes LAN Systems, Inc., Performance Systems
International, March 1991.
[4] Bradley, T., and C. Brown, "Inverse Address Resolution Protocol",
RFC1293, Wellfleet Communications, Inc., January 1992.
[5] Baker, F., and R. Coltun, "OSPF Version 2 Management Information
Base", RFC1253, ACC, Computer Science Center, August 1991.
Security Considerations
Security issues are not discussed in this memo.
7. Authors" Addresses
Osmund S. deSouza
AT&T Bell Laboratories
Room 1K-606
101 Crawfords Corner Road
Holmdel, NJ 07733
Phone: (908) 949-1393
EMail: osmund.desouza@att.com
Manoel A. Rodrigues
Room 1K-608
AT&T Bell Laboratories
101 Crawfords Corner Road
Holmdel, NJ 07733
Phone: (908) 949-4655
EMail: manoel.rodrigues@att.com
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