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+Network Working Group                                         Y. Rekhter
+Request for Comments: 1817                                 cisco Systems
+Category: Informational                                      August 1995
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+                       CIDR and Classful Routing
+
+Status of this Memo
+
+   This memo provides information for the Internet community.  This memo
+   does not specify an Internet standard of any kind.  Distribution of
+   this memo is unlimited.
+
+Abstract
+
+   Classless Inter-Domain Routing (CIDR) is used in the Internet as the
+   primary mechanism to improve scalability of the Internet routing
+   system. This document represents the IAB's (Internet Architecture
+   Board) evaluation of the current and near term implications of CIDR
+   on organizations that use Classful routing technology.
+
+Background
+
+   Classless Inter-Domain Routing (CIDR) ([RFC1518], [RFC1519]) is
+   deployed in the Internet as the primary mechanism to improve scaling
+   property of the Internet routing system. Essential to CIDR is the
+   generalization of the concept of variable length subnet masks (VLSM)
+   and the elimination of classes of network numbers (A, B, and C). The
+   interior (intra-domain) routing protocols that support CIDR are OSPF,
+   RIP II, Integrated IS-IS, and E-IGRP.  The exterior (inter-domain)
+   routing protocol that supports CIDR is BGP-4.  Protocols like RIP,
+   BGP-3, EGP, and IGRP do not support CIDR.
+
+Implications of CIDR
+
+   Deployment of CIDR has certain implications on the segments of the
+   Internet that are still using routing technology that can not support
+   CIDR. Existing sites that rely solely on a default route for their
+   external connectivity may not require support of VLSM capable routing
+   technology for their interior routing and CIDR for their exterior
+   routing. All sites lacking support for VLSM and CIDR capable routing
+   must rely on a default route, which consequently may result in a
+   various degree of suboptimal routing.  Organizations that operate as
+   Internet Service Providers (ISPs) are expected to be able to support
+   VLSM and CIDR.
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+Rekhter                      Informational                      [Page 1]
+
+RFC 1817               CIDR and Classful Routing             August 1995
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+   It is expected that in the near future the IANA will instruct the
+   Internet Registries to begin allocating IP addresses out of the
+   former Class A address space (64.0.0.0 through 126.0.0.0). The
+   allocated blocks are going to be of variable size (based on the
+   actual sites' requirements).  Sites that will use these addresses
+   will have to support CIDR-capable routing protocols. All the
+   providers will be required to support CIDR-capable routing protocols
+   as well. Sites that do not use these addresses would be required to
+   continue relying on a default route, which in turn may result in a
+   various degree of suboptimal routing. If a site wants to avoid the
+   suboptimality (introduced by using default route), the site will need
+   to transition to CIDR-capable routing protocols.
+
+Security Considerations
+
+   Security issues are not discussed in this memo.
+
+Author's Address
+
+   Yakov Rekhter
+   cisco Systems
+   170 West Tasman Drive
+   San Jose, CA 95134
+
+   Phone: (914) 528-0090
+   EMail: yakov@cisco.com
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+Rekhter                      Informational                      [Page 2]
+