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Network Working Group                                 C. Huitema, ChairRequest for Comments: 1481                  Internet Architecture Board                                                              July 1993IAB Recommendation for an Intermediate Strategy toAddress the Issue of ScalingStatus 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 1993References   [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",RFC1466, 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: Christian.Huitema@MIRSA.INRIA.FRIAB                                                             [Page 2]