Network Working Group                                 C. Huitema, Chair
Request for Comments: 1481                  Internet Architecture Board
                                                             July 1993


          IAB Recommendation for an Intermediate Strategy to
                    Address the Issue of Scaling

Status of this Memo

  This memo provides information for the Internet community.  It does
  not specify an Internet standard.  Distribution of this memo is
  unlimited.

Recommendation

  Classless Inter-Domain Routing (CIDR) proposes strategies for address
  assignment of the existing IP address space with a view to conserve
  the address space and stem the explosive growth of routing tables in
  default-route-free routers run by transit routing domain providers
  [1].  CIDR is proposed as an immediate term strategy to extend the
  life of the current 32 bit IP address space.  This strategy presumes
  that a suitable long term solution is being addressed within the
  Internet technical community.

  The basic components of the CIDR plan are: management of the
  allocation of Internet address space and provision of a mechanism for
  aggregation of routing information.  The IP community has published
  several RFCs and Internet-Drafts which describe the architecture for
  IP address assignment and routing protocols which will promote the
  deployment of CIDR.  These documents have led to changes in the way
  network address are allocated and have prompted enhancements to the
  inter-domain and intra-domain routing protocols.

  With the CIDR prompted changes in the management of the allocation of
  the Internet address space, allocation of blocks of Class C numbers
  leads to an explosion of the routing tables.  So, it is important
  that the techniques for aggregating information in the routing
  protocols keep pace with the change in the allocation of IP numbers.

  The IAB endorses the CIDR architecture and its implementation.  In
  addition, the IAB supports the actions taken by the IANA and
  InterNIC, the router vendors, and the network operators to implement
  CIDR to address the scaling problem that we are facing with the
  growth of the Internet.






IAB                                                             [Page 1]

RFC 1481                      IAB on CIDR                      July 1993


References

  [1] Fuller, V., Li, T., Yu, J., and K. Varadhan, "Supernetting: an
      Address Assignment and Aggregation Strategy", RFC 1338, BARRNet,
      cisco, Merit, OARnet, June 1992.

  [2] Gerich, E., "Guidelines for management of IP Address Space", RFC
      1466, Merit, May 1993.

  [3] Topolcic, C., "Schedule for IP Address Space Management
      Guidelines", RFC 1367, CNRI, October 1992.

  [4] Rekhter, Y., and T. Li, "An Architecture for IP Address
      Allocation with CIDR", Work in Progress, January 1993.

  [5] Rekhter, Y., and C. Topolcic, "Exchanging Routing Information
      across Provider/Subscriber Boundaries in CIDR environment", Work
      in Progress, February 1993.

Security Considerations

  Security issues are not discussed in this memo.

Author's Address

  Christian Huitema
  INRIA, Sophia-Antipolis
  2004 Route des Lucioles
  BP 109
  F-06561 Valbonne Cedex
  France

  Phone: +33 93 65 77 15
  EMail: [email protected]

















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