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Supported Requests For Comments

The table below lists the Requests for Comments (RFCs) supported by the Cisco Internetwork Operating System (Cisco IOS) software as of Cisco IOS Release 11.3, in descending numerical order. RFCs that have been superseded or replaced are identified, as are RFCs that are partially supported or supported only from Software Release 9.21 forward.

Cisco-Supported Requests for Comments
Standard Number Standard Title
RFC 2125   PPP Bandwidth Allocation Protocol (BAP)
PPP Bandwidth Allocation Control Protocol (BACP)
RFC 2037   Entity MIB
RFC 2018   TCP Selective Acknowledgment Options
RFC 1997   BGP Communities Attribute
RFC 1994 Supersedes RFC 1334 PPP Challenge Handshake Authentication Protocol (CHAP)
RFC 1990 Supersedes RFC 1717 The PPP Multilink Protocol (MP)
RFC 1989 Supersedes RFC 1333 PPP Link Quality Monitoring
RFC 1918   Address Allocation for Private Internet Space
RFC 1907   Management Information Base for Simple Network Management Protocol (SNMPv2)
RFC 1906   Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)
RFC 1905   Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)
RFC 1904   Conformance Statements for Version 2 of the Simple Network Management Protocol (SNMPv2)
RFC 1903   Textual Conventions for Version 2 of the Simple Network Management Protocol (SNMPv2)
RFC 1902   Structural Management for Version 2 of the Simple Network Management Protocol (SNMPv2)
RFC 1901 Supersedes RFC 1441-1450 Introduction to Community-based SNMPv2
RFC 1889   RTP---A Transport Protocol for Real-Time Applications
RFC 1850   OSPF Version 2 MIB
RFC 1812   Requirements for IP Version 4 Routers
RFC 1795   DLSw: Switch-to-Switch Protocol
RFC 1793   Extending OSPF to Support Demand Circuits
RFC 1771   A Border Gateway Protocol 4
RFC 1745   BGP4/IDRP for IP---OSPF Interaction
RFC 1724   RIP Version 2 MIB Extension
RFC 1723   RIP Version 2 Carrying Additional Information
RFC 1722   RIP Version 2 Protocol Applicability Statement
RFC 1717 Replaced by RFC 1990 The PPP Multilink Protocol (MP)
RFC 1695   Definitions of Managed Objects for ATM Management Version 8.0 using SMIv2
RFC 1661 Supersedes RFC 1548 PPP (Point-to-Point Protocol)
RFC 1654    A Border Gateway Protocol (BGP-4)
RFC 1647   TN3270 Enhancements
RFC 1646   Cisco supports LU name selection method only
RFC 1638   PPP Bridging Control Protocol (BCP)
RFC 1634 Supersedes 1362 and 1551 Novell Routing over Various WAN Media (IPXWAN)
RFC 1633   Integrated Services in the Internet Architecture: An Overview
RFC 1631   The IP Network Address Translator
RFC 1618   PPP over ISDN
RFC 1604   Definitions of Managed Objects for Frame Relay Service
RFC 1587   The OSPF Not-So-Stubby Area (NSSA) Option
RFC 1583 Supersedes RFC 1247 OSPF Version 2
RFC 1577   Classical IP and ARP over ATM
RFC 1576   TN3270 Current Practices
RFC 1559   DECnet Phase IV MIB Extensions
RFC 1552   The PPP Internetwork Packet Exchange Control Protocol (IPXCP)
RFC 1549   PPP in HDLC Framing
RFC 1548 Replaced by RFC 1661 PPP (Point-to-Point Protocol)
RFC 1541 Supersedes RFC 1531 Dynamic Host Configuration Protocol
RFC 1531 Replaced by RFC 1541 Dynamic Host Configuration Protocol
RFC 1519   Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation Strategy
RFC 1510   The Kerberos Network Authentication Service (V5)
RFC 1492   Access Control Protocol or TACACS
RFC 1490   Multiprotocol Interconnect over Frame Relay
RFC 1483   Multiprotocol Encapsulation over ATM Adaptation Layer 5
RFC 1469   IP Multicast over Token-Ring Local Area Network
RFC 1450 Replaced by RFC 1907 MIB for SNMP Version 2
RFC 1403   BGP OSPF Interaction
RFC 1397   Default Route Advertisement in BGP2 and BGP3
RFC 1395   BootP Extensions
RFC 1393   Traceroute using an IP Option
RFC 1390   Transmission of IP and ARP over FDDI Networks
RFC 1382   SNMP MIB Extension for X.25 Packet Layer
RFC 1381   SNMP MIB Extension for X.25 LAPB
RFC 1378   PPP AppleTalk Control Protocol (ATCP)
RFC 1377   PPP OSI Network Layer Control Protocol (OSINLCP)
RFC 1376   PPP DECnet Phase IV Control Protocol (DNCP)
RFC 1370   Applicability Statement for OSPF
RFC 1362   Novell IPX Over Various WAN Media (IPXWAN)
RFC 1356   Multiprotocol Interconnect on X.25 and ISDN in the Packet Mode
RFC 1350   TFTP Version 2
RFC 1349   Type of Service in the Internet Protocol Suite
RFC 1334 Replaced by RFC 1994 PPP Authentication Protocols
RFC 1333 Replaced by RFC 1989 PPP Link Quality Monitoring
RFC 1332   PPP Internet Protocol Control Protocol (IPCP)
RFC 1331 Replaced by RFC 1548 PPP for the Transmission of Multi-protocol Datagrams over Point-to-Point Links
RFC 1323   TCP Extensions for High Performance
RFC 1315   MIB for Frame Relay DTE's
RFC 1305   Network Time Protocol (NTP) Version 3
RFC 1294 Replaced by RFC1490 Multiprotocol Interconnect over Frame Relay
RFC 1293   Inverse ARP
RFC 1286   Definitions of Managed Objects for Bridges
RFC 1269   Definitions of Managed Objects for the Border Gateway Protocol (Version 3)
RFC 1268   Application of BGP in the Internet
RFC 1267   BGP-3
RFC 1256   ICMP Router Discovery Messages
RFC 1253   MIB for OSPF Version 2
RFC 1247 Replaced by RFC 1583 OSPF Version 2
RFC 1236   IP-to-X.121 Address Mapping for DDN
RFC 1234   Tunneling IPX Traffic through IP Networks
RFC 1231   IEEE 802.5 Token Ring MIB
RFC 1220   Point-to-Point Protocol (PPP) Extensions for Bridging
RFC 1219   On the Assignment of Subnet Numbers
RFC 1215   Convention for Defining Traps for Use with SNMP
RFC 1213   Management Information Base for Network Management of TCP/IP-based Internets: MIB-II
RFC 1212   Concise MIB Definitions.
RFC 1209   Transmission of IP Datagrams over SMDS Service
RFC 1196   Finger User Information Protocol
RFC 1195   Use of OSI IS-IS for Routing in TCP/IP in Dual Environments
RFC 1191   Path MTU Discovery
RFC 1188 Replaced by RFC 1390 Proposed Standard for the Transmission of IP Datagrams over FDDI Networks
RFC 1172   PPP Initial Configuration Options
RFC 1171 Replaced by RFC 1331 Point-to-Point Protocol for the Transmission of Multi-Protocol Datagrams over Point-to-Point links
RFC 1166   Internet Numbers
RFC 1164   Application of the BGP in the Internet
RFC 1163   Border Gateway Protocol (BGP)
RFC 1157   Simple Network Management Protocol (SNMP)
RFC 1156 Replaced by RFC 1213 MIB for TCP/IP
RFC 1155 Replaced by RFC 1212 Structure and Identification of Management Information for TCP/IP-Based Internets
RFC 1144   Compressing TCP/IP Headers for Low-Speed Serial Links
RFC 1141   Incremental Updating of the Internet Checksum
RFC 1139   Echo Function for ISO 8473 (PING)
RFC 1136   Administrative Domains and Routing Domains: A Model for Routing in the Internet
RFC 1122   Requirements for Internet Hosts---Communication Layers
RFC 1112   Host Extensions for IP Multicasting
RFC 1108 DCA Draft IP Security Option (IPSO)
RFC 1101   DNS Encoding of Network Names and Other Types
RFC 1091   Telnet Terminal-Type Option
RFC 1084   BootP Extensions
RFC 1080   Telnet Remote Flow Control Option
RFC 1079   Telnet Terminal Speed Option
RFC 1069   Guidelines for the use of Internet-IP Addresses in the ISO  Connectionless-Mode Network Protocol
RFC 1060   Assigned Numbers
RFC 1058   Routing Information Protocol (RIP)
RFC 1055   Standard for the Transmission of IP Datagrams Over Serial Lines: SLIP
RFC 1042   Standard for the Transmission of IP Datagrams Over IEEE 802 Networks
RFC 1035   Domain Names---Implementation and Specification
RFC 1034   Domain Names---Concepts and Facilities
RFC 1027   Using ARP to Implement Transparent Subnet Gateways (Proxy ARP)
RFC 1009   Requirements for Internet Gateways
RFC 995 Replaced by ISO 9542 ES-to-IS Routing Exchange Protocol for Use in Conjunction with ISO  8473
RFC 994 Replaced by ISO 8473 Protocol for Providing the Connectionless-Mode Network Service
RFC 982   Guidelines for the Specification of the Top of the Structure of the Domain Specific Part (DSP) of the ISO Standard NSAP Address
RFC 951   Bootstrap Protocol (BootP)
RFC 950   Internet Standard Subnetting Procedure
RFC 925   Multi-LAN Address Resolution (PROXY ARP)
RFC 922   Broadcasting Internet Datagrams in the Presence of Subnets (IP_BROAD)
RFC 919   Broadcasting Internet Datagrams
RFC 906   Bootstrap Loading Using TFTP
RFC 904   Exterior Gateway Protocol (EGP) Formal Specification
RFC 903   Reverse Address Resolution Protocol (RARP)
RFC 896   Congestion Control in TCP/IP Internetworks
RFC 895   Standard for the transmission of IP datagrams over experimental Ethernet networks
RFC 894   Standard for the Transmission of IP Datagrams over Ethernet
RFC 891   Hello Protocol
RFC 879   The TCP Maximum Segment Size and Related Topics
RFC 877   Standard for the Transmission of IP Datagrams Over Public Data Networks
RFC 874   Telnet Protocol Specification
RFC 863   Discard Service (TCP discard)
RFC 862   Echo Service (TCP echo)
RFC 860   Telnet Timing Mark Option
RFC 858   Telnet Suppress Go Ahead option
RFC 857   Telnet Echo Option
RFC 856   Telnet Binary Transmission
RFC 855   Telnet Option Specification
RFC 854 MIL STD 1782 Telnet Protocol Specification
RFC 827   Exterior Gateway Protocol (EGP)
RFC 826   Address Resolution Protocol (ARP)
RFC 815   IP Datagram Reassembly Algorithms
RFC 813   Window and Acknowledgment Strategy in TCP/IP
RFC 793 MIL STD 1778 Transmission Control Protocol (TCP)
RFC 792   Internet Control Message Protocol (ICMP)
RFC 791 MIL STD 1777 Internetwork Protocol (IP)
RFC 783   Trivial File Transfer Protocol (TFTP) (version 2)
RFC 779   Telnet Send-Location Option
RFC 768   User Datagram Protocol (UDP)