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RFC 827 - EXTERIOR GATEWAY PROTOCOL (EGP) Gateways which encounter EGP messages in their message streams which are not addressed to them may discard them. However, a gateway is required to respond to an NR Poll from a direct neighbor within several seconds (subject to the qualification two paragraphs hence), even if the gateway believes that neighbor to be down. When the stub declares the core gateways which are direct neighbors to be reachable, it should poll those gateways for NR messages at a rate not to exceed once per minute (or as specified in the Hello messages from the core gateways). ip-doc.com /rfc/rfc827   (6424 words)

[No title] The protocols, and in particular the routing algorithm which these gateways use among themselves, will be a private matter, and need never be implemented in gateways outside the particular domain or system. Such a gateway might be called a "stub gateway", since its only purpose is to interface the local network to the rest of the internet, and it is not intended to be used for handling any traffic which neither originated in nor is destined for that particular local network. Gateways in other autonomous systems may use their own Interior Gateway Protocols (IGPs), which may or may not be similar to the IGP of any other autonomous system. www.ietf.org /rfc/rfc827.txt   (6660 words)

RFC 904 - Exterior Gateway Protocol Formal Specification protocol must operate in the active mode; however, the neighbor-reachability protocol is designed to work even if both neighbors operate in the active mode. The interval between the time the gateway enters the Idle state as the result of receiving a Cease command and the time when it next sends a Request command to resume the protocol is not specified; however, it is recommended this interval be at least P5 seconds. Two types of gateway lists can be included in the Update response, the format of which is described in Appendix A. Both lists include only those gateways directly connected to the net specified in the IP Source Network field of the last-received Poll command. ip-doc.com /rfc/rfc904   (5489 words)

[No title] RFC 827 EXTERIOR GATEWAY PROTOCOL (EGP) Eric C. Rosen Bolt Beranek and Newman Inc. October 1982 It is proposed to establish a standard for Gateway to Gateway procedures that allow the Gateways to be mutually suspicious. Gateways in other autonomous systems may use their own Interior Gateway Protocols (IGPs), which may or may not be similar to the IGP of any other autonomous system. The core gateways will send complete NR messages, containing information about all other gateways on the common networks, both core gateways (which shall be listed as interior neighbors) and other gateways (which shall be listed as exterior neighbors, and may include the stub itself). www.mit.edu /afs/athena.mit.edu/reference/rfc/rfc827.txt   (6660 words)

RFC 1930 (rfc1930) - Guidelines for creation, selection, and registration Since this classic definition was developed, it has become common for a single AS to use several interior gateway protocols and sometimes several sets of metrics within an AS. If already running an exterior routing protocol, it is perfectly reasonable to use your AS number as an IGP tag; if you do not, choosing from the private use range is also acceptable (see "Reserved AS Numbers"). [EGP] Mills, D., "Exterior Gateway Protocol Formal Specifications", STD 18, RFC 904, International Telegraph and Telephone Co., April 1984. www.faqs.org /rfcs/rfc1930.html   (2675 words)

Pantek - Expert Linux and Open Source Services: : RFC #890: Exterior Gateway Protocol implementation schedule. J. ...   (Site not responding. Last check: 2007-10-19) The dumb gateways must be listed in the smart gateway routing tables, and changes in dumb gateways status (e.g., adding new dumb gateways) in the smart gateways tables requires human intervention. Gateways that connect a single network to the edge of the Internet may be called "stub" gateways. This is difficult to perform because the smart gateways are maintained by several different groups, and because it is difficult to isolate a subset of these gateways for testing new procedures. www.pantek.com /library/general/rfc/rfc890.html   (851 words)

RFC 827 - Exterior Gateway Protocol (EGP) RFC 827 EXTERIOR GATEWAY PROTOCOL (EGP) Eric C. Rosen Bolt Beranek and Newman Inc. October 1982 It is proposed to establish a standard for Gateway to Gateway procedures that allow the Gateways to be mutually suspicious. Since it is a polling protocol, it also enables each gateway to control the rate at which it sends - 5 - RFC 827 Bolt Beranek and Newman Inc. Eric C. Rosen and receives network reachability information, allowing each system to control its own overhead. The polled gateway will return this number in the NR message it sends in response to the poll, to enable the polling gateway to match up received NR messages with - 22 - RFC 827 Bolt Beranek and Newman Inc. Eric C. Rosen polls. www.packetizer.com /rfc/rfc827   (6686 words)

RFC 1772 - Application of the Border Gateway Protocol in the Internet The classic definition of an Autonomous System is a set of routers under a single technical administration, using an interior gateway protocol and common metrics to route packets within the AS and using an exterior gateway protocol to route packets to other AS's. In general, traffic originating outside of a given AS is going to pass through both interior gateways (gateways that support the IGP only) and border gateways (gateways that support both the IGP and BGP). The address of the exit gateway A for some exterior destination X is specified in the BGP identifier field of the BGP OPEN message received from gateway A (via BGP) by all other border gateways within the same AS. ip-doc.com /rfc/rfc1772   (5538 words)

EGP - Exterior Gateway Protocol EGP is an obsolete protocol that was replaced by BGP. The protocol used by a gateway in one autonomous system to advertise the IP addresses of networks in that system to a gateway in another autonomous system. A reachability routing protocol used by a gateway or router in one autonomous system to advertise the IP addresses of networks in that autonomous system to a gateway or router in another autonomous system. www.auditmypc.com /acronym/EGP.asp   (409 words)

Exterior Gateway Protocol - a Whatis.com definition - see also: EGP   (Site not responding. Last check: 2007-10-19) Exterior Gateway Protocol (EGP) is a protocol for exchanging routing information between two neighbor gateway EGP is commonly used between hosts on the Internet to exchange routing table information. A more recent exterior gateway protocol, the Border Gateway Protocol (BGP), provides additional capabilities. whatis.techtarget.com /definition/0,,sid9_gci213930,00.html   (209 words)

RFC 888 - "STUB" Exterior Gateway Protocol. L. Seamonson, E.C. Rosen. RFC 888 JANUARY 1984 GATEWAYS; choosing algorithms and parameters in isolation, without considering the characteristics of the neighbor and the connecting network, would not be expected to result in optimum reachability determinations. RFC 888 JANUARY 1984 The core gateways will send complete NR messages, containing information about all other gateways on the common network, both core gateways (which shall be listed as interior neighbors) and other gateways (which shall be listed as exterior neighbors, and may include the stub itself). RFC 888 JANUARY 1984 The EGP checksum is the 16-bit one's complement of the one's complement sum of the EGP message starting with the EGP version number field. rfc.sunsite.dk /rfc/rfc888.html   (5466 words)

The TCP/IP Guide - TCP/IP Exterior Gateway Protocol (EGP) The EGP protocol discussed here is a specific instance of an exterior gateway protocol, for which the abbreviation is also EGP. Thus, you may occasionally see BGP also called an “exterior gateway protocol” or an “EGP”, which is the generic use of this term. EGP is responsible for communication of network reachability information between neighboring routers, which may or may not be in different autonomous systems. www.tcpipguide.com /free/t_TCPIPExteriorGatewayProtocolEGP.htm   (480 words)

The TCP/IP Guide - TCP/IP Exterior Gateway Protocol (EGP) For an EGP connection to be established between a pair of neighbors, each must first successfully acquire the other with a Confirm message. EGP was not designed to handle an arbitrary topology of autonomous systems like BGP, and cannot guarantee the absence of routing loops if such loops exist in the interconnection of neighboring routers. EGP is more limited than BGP in capability and is now considered a historical protocol. www.tcpipguide.com /free/t_TCPIPExteriorGatewayProtocolEGP-2.htm   (580 words)

RFC 827 (rfc827) - Exterior Gateway Protocol (EGP) - 28 - RFC 827 Bolt Beranek and Newman Inc. Eric C. Rosen When the stub declares the core gateways which are direct neighbors to be reachable, it should poll those gateways for NR messages at a rate not to exceed once per minute (or as specified in the Hello messages from the core gateways). The core gateways will report distances less than 128 if the network can be reached without leaving the core system (i.e., - 29 - RFC 827 Bolt Beranek and Newman Inc. Eric C. Rosen without traversing any gateway other than a core gateway), and greater than or equal to 128 otherwise. In both these cases, the core gateways may discard traffic destined for - 30 - RFC 827 Bolt Beranek and Newman Inc. Eric C. Rosen those networks, returning ICMP "destination network unreachable" to the source hosts. www.faqs.org /rfcs/rfc827.html   (6707 words)

EGP, Exterior Gateway Protocol EGP exists in order to convey net-reachability information between neighboring gateways, possibly in different autonomous systems. The protocol is based on periodic polling using Hello/I-Heard-You (I-H-U) message exchanges to monitor neighbor reachability and Poll commands to solicit Update responses. The EGP checksum is the 16-bit one's complement of the one's complement sum of the EGP message starting with the EGP version number field. www.networksorcery.com /enp/protocol/egp.htm   (173 words)

RFC 827 - Exterior Gateway Protocol (EGP). E.C. Rosen. RFC 827 Bolt Beranek and Newman Inc. Eric C. Rosen It must also be clearly understood that the Exterior Gateway Protocol is NOT intended to provide information which could be used as input to a completely general area or hierarchical routing algorithm. RFC 827 Bolt Beranek and Newman Inc. Eric C. Rosen "prior agreement" are not part of the Exterior Gateway Protocol.) A direct neighbor gateway should also be declared unreachable if the network connecting it supplies lower level protocol information from which this can be deduced. RFC 827 Bolt Beranek and Newman Inc. Eric C. Rosen When the stub declares the core gateways which are direct neighbors to be reachable, it should poll those gateways for NR messages at a rate not to exceed once per minute (or as specified in the Hello messages from the core gateways). rfc.sunsite.dk /rfc/rfc827.html   (6839 words)

What is Exterior Gateway Protocol? - a definition from Whatis.com - see also: EGP EGP is commonly used between hosts on the Internet to exchange routing table information. The routing table contains a list of known routers, the addresses they can reach, and a cost metric associated with the path to each router so that the best available route is chosen. A more recent exterior gateway protocol, the Border Gateway Protocol (BGP), provides additional capabilities. searchsmb.techtarget.com /sDefinition/0,,sid44_gci213930,00.html   (260 words)

Exterior Gateway Protocol   (Site not responding. Last check: 2007-10-19) EGP is part of the TCP/IP protocol suite. Routers within each autonomous system are chosen to use EGP to talk to the outside world, usually over the Internet. The EGP neighbors exchange information about the networks that can be reached within the neighbors' respective autonomous systems. www.novell.com /documentation/nw42/cncptenu/data/hh7tdrfe.html   (57 words)

Exterior Gateway Protocol Definition. Define Exterior Gateway Protocol. What is Exterior Gateway Protocol? EGP A protocol which distributes routing information to the routers which connect autonomous systems. The term "gateway" is historical, and "router" is currently the preferred term. There is also a routing protocol called EGP defined in STD 18, RFC 904. www.definethat.com /go/411.htm   (56 words)

Network Protocol Suite Directory Index A network protocol is a formal set of rules, conventions and data structure that governs how computers exchange information over a network. In other words, network protocol is a standard procedure and format that two data communication devices must understand, accept and use to be able to talk to each other. Network protocols are defined by many standard organizations worldwide and technology vendors over years of technology evolution and developments. www.javvin.com /protocolsuite.html   (530 words)

Exterior Gateway Protocol from FOLDOC   (Site not responding. Last check: 2007-10-19) (EGP) A protocol which distributes routing information to the routers which connect autonomous systems. There is also a routing protocol called EGP defined in STD 18, RFC 904. See also Border Gateway Protocol, Interior Gateway Protocol. www.instantweb.com /foldoc/foldoc.cgi?EGP   (73 words)

Pantek - Expert Linux and Open Source Services: : RFC #904: Exterior Gateway Protocol formal specification. D.L. Mills. Pantek - Expert Linux and Open Source Services: : RFC #904: Exterior Gateway Protocol formal specification. unable to assume compatible mode 7 protocol violation 1. Gateway n IP address (without network #) www.pantek.com /library/general/rfc/rfc904.html   (6332 words)

EGP - Exterior Gateway Protocol   (Site not responding. Last check: 2007-10-19) EGP is a dynamic routing protocol, it uses a very simple design. It does not use metrics and therefore cannot make true intelligent routing decisions. EGP is the primary inter-domain routing protocol used on the Internet. www.unm.edu /~network/presentations/course/chap7/sld051.htm   (46 words)

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