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Topic: External gateway protocol

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BGP

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	EGP - Exterior Gateway Protocol
		Not to be confused with the general term exterior gateway protocol.
		EGP is an obsolete protocol that was replaced by BGP.
		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 (393 words)

	Existing Routing Protocols and IPv6 (Site not responding. Last check: 2007-10-23)
		Various routing protocols have been developed over the years to deal with the various types of routing problem domains, ranging from internal routing protocols (routing within an autonomous system) to external routing protocols (routing between different autonomous systems).
		The current routing protocols are adequate for the current version of the IP protocol (IPv4), but they are not without their problems, the largest of which is the explosion in routing table size caused by the unforeseen growth of the Internet.
		The Inter-Domain Routing Protocol (IDRP) was first designed for use with the OSI family of protocols developed by the ISO, and is defined in the ISO standard 10747.
	www.tml.tkk.fi /Opinnot/T-110.551/1996/ip6routing.html (6288 words)

	Border Gateway Protocol - Wikipedia, the free encyclopedia
		BGP was created to replace the EGP routing protocol to allow fully decentralized routing in order to allow the removal of the NSFNET Internet backbone network.
		Among routing protocols, BGP is unique in using TCP as its transport protocol.
		RFC 4271, A Border Gateway Protocol 4 (BGP-4) (obsoletes: RFC 1771)
	en.wikipedia.org /wiki/BGP (1352 words)

	Border gateway protocol
		It is described as a path vector[?] protocol.
		BGP is unique among routing protocols in this respect by using TCP as its transport protocol.
		It is comprised of two parts, Interior Border Gateway Protocol and Exterior Border Gateway Protocol, respectively known as IBGP and EBGP.
	www.ebroadcast.com.au /lookup/encyclopedia/bg/BGP.html (561 words)

	InformIT -- Gateway and Routing Protocols (Site not responding. Last check: 2007-10-23)
		EGP messages between gateways are usually sent whenever a connection problem exists and the routing information is set to its maximum (worst) value, or when a better connection alternative has been discovered for some reason.
		The number of internal gateways and number of external gateways fields specify the number of interior and exterior gateways that are reported in the message, respectively.
		EGP is also a state-driven protocol, meaning that it depends on a state table containing values that reflect gateway conditions and a set of operations that must be performed when a state table entry changes.
	users.med.auth.gr /~serafim/tcpip/index05.html (10002 words)

	Protocol: IGRP ( Interior Gateway Routing Protocol )
		It is possible that a gateway that has not yet gotten the triggered update will issue a regular update at just the wrong time, causing the bad route to be reinserted in a neighbor that had already gotten the triggered update.
		EGP (Exterior Gateway Protocol) is for exchanging routing information between two neighbor gateway hosts in a network of autonomous systems.
		OSPF is an interior gateway protocol which is used for routing within a group of routers.
	www.protocolbase.net /protocols/protocol_IGRP.php (3420 words)

	Border Gateway Protocol (BGP)
		Understand the purpose of the Border Gateway Protocol.
		The multi-exit discriminator (MED) or metric attribute is used as a suggestion to an external AS regarding the preferred route into the AS that is advertising the metric.
		RFC 1771, A Border Gateway Protocol 4 (BGP-4)
	www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/bgp.htm (1802 words)

	RFC 1771 (rfc1771) - A Border Gateway Protocol 4 (BGP-4) (Site not responding. Last check: 2007-10-23)
		It is built on experience gained with EGP as defined in RFC 904 [1] and EGP usage in the NSFNET Backbone as described in RFC 1092 [2] and RFC 1093 [3].
		If the transport protocol connect fails (e.g., retransmission timeout), the local system restarts the ConnectRetry timer, continues to listen for a connection that may be initiated by the remote BGP peer, and changes its state to Active state.
		If a disconnect notification is received from the underlying transport protocol, the local system closes the BGP connection, restarts the ConnectRetry timer, while continue listening for connection that may be initiated by the remote BGP peer, and goes into the Active state.
	www.faqs.org /rfcs/rfc1771.html (14146 words)

	Border Gateway Protocol
		Border Gateway Protocol Version 4 (BGP-4), documented in RFC 1771, is the current exterior routing protocol used for the global Internet.
		The AS's interior routing protocol is responsible for computing an interior route to reach the BGP NEXT_HOP.
		The two most important consequences of this design are the need for interior routing protocols to reach one hop beyond the AS boundary, and for BGP sessions to be fully meshed within an AS.
	networking.ringofsaturn.com /Protocols/BGP.php (611 words)

	BGP, Border Gateway Protocol (Site not responding. Last check: 2007-10-23)
		This is an advisory qualification to readvertisement of a route prefix, permitting an AS not to readvertise the route prefix to all external bilateral peer neighbour AS's.
		It is consistent with these semantics that an AS may filter received prefixes that are received across a peering session that the receiver regards as a bilateral peer sessions.
		[RFC 1654] A Border Gateway Protocol 4 (BGP-4).
	www.networksorcery.com /enp/protocol/bgp.htm (742 words)

	Introduction to the Border Gateway Patrol > Exterior and Interior Gateway Protocols (Site not responding. Last check: 2007-10-23)
		When networks were small, there was no concept of interior and exterior gateway protocols; a network ran a routing protocol, and that was the end of it.
		Routing protocols providing reachability information within an autonomous system need to be focused on one thing: providing accurate information about the topology of the network as quickly and efficiently as possible.
		Some policy propogation is creeping into interior gateway protocols in the form of information about the quality of service across various paths within a network; even here, the definitions of interior and exterior routing becomes blurred.
	www.awprofessional.com /articles/article.asp?p=331613&seqNum=7 (1931 words)

	BGP, Border Gateway Protocol
		BGP version 2 removed from the protocol the concept of "up", "down", and "horizontal" relations between autonomous systems that were present in version 1.
		An externally visible autonomous system number that identifies the confederation as a whole.
		All routes received carrying a communities attribute containing this value MUST NOT be advertised to external BGP peers (this includes peers in other members autonomous systems inside a BGP confederation).
	filibusta.crema.unimi.it /docs/rfc/bgp.htm (564 words)

	Border Gateway Protocol (BGP)
		Border Gateway Protocol (BGP) version 4 (RFC 1771) is the de facto routing protocol that is used currently to maintain connectivity between ASs.
		BGP is a path vector protocol, a modified form of distance vector protocol.
		A BGP speaker shall calculate the degree of preference for each external route based on the locally configured policy, and include the degree of preference when advertising a route to its internal peers.
	www.estoile.com /links/bgp4.htm (739 words)

	VOIP - Voice Over Internet Protocol ( Glossary)
		An AS uses an internal gateway protocol and common metrics to route Packets within the AS, and uses an external gateway protocol to route packets to other ASs.
		The protocol provides: control for various types of terminations, support for negotiation of call capabilities, multi user call scenarios, rich termination dynamics, Quality of Service (QoS) and traffic measurement support, error reporting on protocol, call, and capability and network failures.
		In H.323 scenario, this protocol is encapsulated in TCP and sent to port 1720.
	www.host4space.com /voip/gloss.html (3162 words)

	Computer Networking Help - Advice From Experts - Introduction to Border Gateway Protocol (BGP) (Site not responding. Last check: 2007-10-23)
		Many times ISP customers with use an IGP (Interior Gateway Protocol) to route their interior networks and will also sometimes use it to exchange routes with their ISP.
		If BGP is used inside of an AS (autonomous system) its referred to as IBGP (Interior Border Gateway Protocol) but when its used to route between AS (autonomous systems) its referred to as EBGP (External Border Gateway Protocol).
		This is an overview of the basic operation of BGP (Border Gateway Protocol), I hope you enjoyed it.
	www.computernetworkinghelp.com /content/view/27/1 (705 words)

	RFC 1163 (rfc1163) - Border Gateway Protocol (BGP)
		Implementers are encouraged to track the progress of this or any protocol as it moves through the standardization process, and to report their own experience with the protocol.
		In response to the ConnectRetry timer expired event, the local system restarts the ConnectRetry timer, initiates a transport connection to other BGP peer, continues to listen for a connection that may be be initiated by the remote BGP peer, and changes its state to Connect.
		The reason for doing this is that routing policies are viewed as external to the protocol and as determined by the local AS administrator.
	www.faqs.org /rfcs/rfc1163.html (7008 words)

	Roxen Community: RFC 827 EXTERIOR GATEWAY PROTOCOL (EGP) ()
		It is proposed to establish a standard for Gateway to Gateway procedures that allow the Gateways to be mutually suspicious.
		Each gateway mentioned in the NR message will have an interface on the network that is in the IP source network field.
		An EGP Error Message is sent in response to an EGP Message that has a bad checksum or has an incorrect value in one of its fields.
	community.roxen.com /developers/idocs/rfc/rfc827.html (6009 words)

	Historical Protocol Development Summary
		He explicitly stated EGP was not a generic hierarchical routing protocol and cautioned developers by including strong statements highlighting the limitations of EGP.
		6] and to overcome the tree-topology limitations of EGP, by pruning routing loops in a meshed AS graph, a new exterior routing protocol, Border Gateway Protocol, was proposed in RFC 1105 [
		A strong polemic can be formulated around the premise: policy-based routing issues dominated IP exterior routing protocol development and detracted from the development of a more robust scalable global routing paradigm.
	www.silkroad.com /papers/html/pba/node2.html (918 words)

	Border Gateway Protocol (BGP) (Site not responding. Last check: 2007-10-23)
		BGP is an exterior gateway protocol (EGP), which means that it performs routing between multiple autonomous systems or domains and exchanges routing and reachability information with other BGP systems.
		Note EGP is a particular instance of an exterior gateway protocol (also EGP)---the two should not be confused.
		As with any routing protocol, BGP maintains routing tables, transmits routing updates, and bases routing decisions on routing metrics.
	www.signaltonoise.net /library/bgp.html (1850 words)

	Interior Gateway Protocol Lab
		You will be configuring routers R1 through R5, while router R6 is preconfigured for EIGRP protocol on serial port S1 and will supply a default route for the lab network.
		Cisco routers have a debug mode that can be helpful in debugging routing protocols, especially distance vector protocols.
		When the same route is learned by multiple protocols, the protocol with the lowest administrative distance is used.
	www.cs.fsu.edu /reference/itl/labs/igp/igp.htm (1028 words)

	Border Gateway Protocol - Gurupedia
		The border gateway protocol (BGP) is one of the core routing protocols in the Internet.
		Since 1994, version four of the protocol has been in use on the Internet; all previous versions are considered obsolete.
		Internet service providers must use BGP to establish routing between one another, it is one of the most important protocols of the Internet.
	www.gurupedia.com /b/bg/bgp.htm (611 words)

	[No title] (Site not responding. Last check: 2007-10-23)
		Autonomous System (AS) Internal or external depending upon whether it is inside an AS or outside.
		Outside an AS, an agreed upon routing protocol must be used - BGF.
		Protocol (1 byte) Enables the Protocol Stack to decide how to handle the data the IP Packet carries.
	www.cs.ntu.edu.au /homepages/coleman/sit381/l4.doc (545 words)

	SNMP MIB II Groups : EGP Group (Site not responding. Last check: 2007-10-23)
		The EGP protocol is used by routers to exchange routing information between different Autonomous System.
		A common protocol, the Internal Gateway Protocol (IGP), such as RIP or OSPF is used for routing inside an Autonomous System.
		The egp subtree is composed of variables that records EGP traffic, the EGP Neighbour Table (egpNeighTable) and the EGP Autonomous System variable (egpAs).
	www.et.put.poznan.pl /snmp/mib2/mgroup27.html (159 words)

	Exterior Gateway Protocol from FOLDOC
		(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.
	ftp.sunet.se /foldoc/foldoc.cgi?Exterior+Gateway+Protocol (71 words)

	TCP/IP Protocols, Multimedia CD Training (Site not responding. Last check: 2007-10-23)
		This course is the second in a three-part series on Transmission Control Protocol/Internet Protocol (TCP/IP).
		Identify the contents of the fields in the EGP message header format.
		Match the types of the TFTP Protocol Data Units with their formats.
	videoed.com /c5445.html (683 words)

	Border Gateway Protocol Configuration
		This course is for internet service providers, networking professionals who need to connect to ISPs and other individuals who need to understand how to configure Cisco routers for the BGP protocol.
		Building Scalable Cisco Networks or equivalent is required.
		On the classroom network consisting of 4 autonomous systems (AS), initialize BGP with internal and external neighbors.
	www.e-bps.com /outlines/Cisco/bgp.htm (349 words)

	Network Glossary: E (Site not responding. Last check: 2007-10-23)
		A product by SoftSwitch, Inc., that acts as a protocol converter for electronic mail between the Unix/SMTP, IBM 3090/DISOSS, and cc:Mail protocols.
		A standard format (RFC 1832) for the common representation of data between diverse platforms.
		RFC 904, that defines how a router should interact with external networks.
	www.clock.org /~jss/glossary/e.html (194 words)

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