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Topic: OSPF

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	Open Shortest Path First - Wikipedia, the free encyclopedia
		OSPF is perhaps the most widely used IGP in large networks.
		Multicast extensions to OSPF (MOSPF) have been defined, however these are not widely used.
		OSPF uses both unicast and multicast to send 'hello packets' and link state updates.
	en.wikipedia.org /wiki/OSPF (706 words)

	OSPF - a Whatis.com definition - see also: Open Shortest Path First protocol (Site not responding. Last check: 2007-10-20)
		OSPF (Open Shortest Path First) is a router protocol used within larger autonomous system networks in preference to the Routing Information Protocol (RIP), an older routing protocol that is installed in many of today's corporate networks.
		Using OSPF, a host that obtains a change to a routing table or detects a change in the network immediately multicasts the information to all other hosts in the network so that all will have the same routing table information.
		OSPF also lets the user assign cost metrics to a given host router so that some paths are given preference.
	whatis.techtarget.com /definition/0,289893,sid9_gci212728,00.html (321 words)

	RFC 2328 (rfc2328) - OSPF Version 2
		OSPF is classified as an Interior Gateway Protocol (IGP).
		The IP source address of an OSPF protocol packet is one end of a router adjacency, and the IP destination address is either the other end of the adjacency or an IP multicast address.
		If RT11 receives an OSPF protocol packet on its interface to Network N8, it may want to associate the packet with the interface to Area 2, or with the virtual link to Router RT10 (which is part of the backbone).
	www.faqs.org /rfcs/rfc2328.html (15202 words)

	OSPF Tutorial
		OSPF is heirarchical, using area 0 as the top as the heirarchy.
		OSPF routers are very careful to keep track of where their border router is.
		OSPF learns which networks it is responsible for when you enter the network command into the router.
	www.geocities.com /Heartland/4394/work/ospf.html (2446 words)

	Open Shortest Path First (OSPF)
		OSPF is a link-state routing protocol that calls for the sending of link-state advertisements (LSAs) to all other routers within the same hierarchical area.
		OSPF is an intra-AS (interior gateway) routing protocol, although it is capable of receiving routes from and sending routes to other ASs.
		After a router is assured that its interfaces are functioning, it uses the OSPF Hello protocol to acquire neighbors, which are routers with interfaces to a common network.
	www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/ospf.htm (1590 words)

	OSPF-2 Protocol Overview
		OSPF Version 2 is documented in RFC 1583 (a lengthy document that I find very difficult to read).
		OSPF is a link-state routing protocol with a complex set of options and features.
		OSPF's primary means of verifying continuing operation of the network is via its Hello Protocol.
	www.freesoft.org /CIE/Topics/89.htm (811 words)

	GameDev.net - Game Dictionary
		OSPF is classified as an Interior Gateway Protocol (IGP), this means that it distributes routing information between routers belonging to a single Autonomous System.
		That means that an OSPF packet is transmitted with an IP data packet header.
		OSPF is designated to be run internal to a single Autonomous System.
	www.gamedev.net /dict/term.asp?TermID=1145 (210 words)

	OSPF
		Also, OSPF supports unnumbered point to point links and equal cost multipath (or load balancing for up to 6 paths; meaning balancing the distribution of IP datagrams down parallel routes to the same destination router using a round robin or a direct addressing option).
		If an area has been added to an OSPF network and it is not possible to connect it directly to the backbone or two organisations that both have a backbone area have merged, then a virtual link is required.
		The achilles heel of OSPF is that all areas are connected to the backbone area.
	ospf.cybersabotage.com /ospf.htm (3836 words)

	RFC 2178 (rfc2178) - OSPF Version 2
		NBMA mode is the most efficient way to run OSPF over non-broadcast networks, both in terms of link-state database size and in terms of the amount of routing protocol traffic.
		The shortest-path tree When no OSPF areas are configured, each router in the Autonomous System has an identical link-state database, leading to an identical graphical representation.
		OSPF protocol packets have been designed so that large protocol packets can generally be split into several smaller protocol packets.
	www.faqs.org /rfcs/rfc2178.html (16414 words)

	Open Shortest Path First IGP (ospf) Charter
		Develop a hitless restart mechanism for OSPF and submit it to the IESG as a Proposed Standard.
		OSPF Stub Router Advertisement (RFC 3137) (0 bytes)
		OSPF Refresh and Flooding Reduction in Stable Topologies (RFC 4136) (0 bytes)
	www.ietf.org /html.charters/ospf-charter.html (569 words)

	OSPF Areas
		Conserving router resources – an OSPF router does NOT maintain a topology database of areas that is does not participate in.
		Alternative ABR relaxes the requirement for an ABR to be connected to the Backbone, and allows the ABR to connect two non-zero areas.
		When an OSPF area is created by the “ospf create area ” command, it is created as a normal area.
	www.riverstonenet.com /support/ospf/ospf-areas.htm (1363 words)

	Welcome!
		OSPF stands for Open Shortest Path First, which means it's an open standard which implements a solution to the Shortest Path First problem.
		OSPF is a dynamic-routing protocol built by the Internet Engineering Task Force (IETF) with TCP/IP in mind.
		The routers that run OSPF are identified and can even be authenticated cryptographically by the protocol, to protect against malicious users distributing false topology information.
	www2.rad.com /networks/2002/ospf (413 words)

	[No title]
		The choice of mode determines the way that the Hello Moy Standards Track [Page 15] RFC 2328 OSPF Version 2 April 1998 protocol and flooding work over the non-broadcast network, and the way that the network is represented in the link- state database.
		For example, on an X.25 PDN a dead neighboring router may be Moy Standards Track [Page 45] RFC 2328 OSPF Version 2 April 1998 indicated by the reception of a X.25 clear with an appropriate cause and diagnostic, and this information would be passed to OSPF.
		Moy Standards Track [Page 51] RFC 2328 OSPF Version 2 April 1998 StubDefaultCost If the area has been configured as a stub area, and the router itself is an area border router, then the StubDefaultCost indicates the cost of the default summary-LSA that the router should advertise into the area.
	www.ietf.org /rfc/rfc2328.txt (15025 words)

	OSPF overhaul boosts IP performance
		The OSPF protocol applies to routing, which allows everything else on a network to work.
		OSPF Version 3 now permits routers to forward IPv6 data across networks, according to the Internet Engineering Task Force (IETF).
		OSPF Version 3 boosts versatility so networks can be adapted to changing requirements.
	www.networkworld.com /news/tech/2000/0724tech.html (782 words)

	Introducing OSPF
		OSPF requires that you divide your network up into a logical star of areas (also sometimes referred to as the "daisy" or "fl-eyed susan" model, since it looks somewhat like how children draw flowers).
		I've been calling this the "vacuum" effect: OSPF area 0 almost seems to pull links into it, until you find your design is all one big area 0, and you have to start over.
		This number is not part of the OSPF LSA's, and hence is purely local to the router.
	www.netcraftsmen.net /welcher/papers/ospf1.htm (2232 words)

	OSPF API (Site not responding. Last check: 2007-10-20)
		The implementation is based on the OSPF code from the Quagga (formerly Zebra) routing protocol suite and is subject to the GNU General Public License.
		The sample application first registers with the OSPF daemon the opaque type it wants to inject and then waits until the OSPF daemon is ready to accept opaque LSAs of that type.
		The OSPF API uses two connections between the client and the OSPF API server: One connection is used for a synchronous request /reply protocol and another connection is used for asynchronous notifications (e.g., LSA update, neighbor status change).
	www.tik.ee.ethz.ch /~keller/ospfapi (1272 words)

	FutureSoft OSPF - Open Shortest Path First (OSPF) protocol
		Using OSPF, a host that obtains a change to a routing table or detects a change in the network immediately
		FutureSoft OSPF implements a link state routing algorithm and maintains a routing table, which is referred to by IP when forwarding packets.
		FutureSoft OSPF reduces the time to market for OEMs and VARs who wish to incorporate the IP routing functionality in their products.
	www.futsoft.com /ospf.htm (812 words)

	Amazon.com: Books: OSPF Complete Implementation (With CD-ROM) (Site not responding. Last check: 2007-10-20)
		Two sample ports are included: (1) an OSPF routing daemon, called ospfd, for the Linux operating system and (2) an OSPF routing simulator, ospf_sim, that can be run under Linux or Windows.
		Like OSPF: Anatomy of an Internet Routing Protocol, this book is for people interested in the practical aspects of Internet routing: students of data communications, TCP/IP network administrators, protocol designers, developers of routing protocol software, and other professionals involved in the design, development, and management of TCP/IP networks.
		Chapter 10, OSPF Hierarchy, begins with a discussion of the restrictions on configuration of OSPF area boundaries.
	www.amazon.com /exec/obidos/tg/detail/-/0201309661?v=glance (1753 words)

	MikroTik RouterOS V2.6 Open Shortest Path First (OSPF) Routing Protocol
		The OSPF protocol is on the link-state protocol that takes care of the routes in the dynamic network structure that can employ different paths to its subnetworks.
		OSPF is an interior gateway protocol that distributes routing information between routers in a single autonomous system.
		This example shows how to use OSPF for backup purposes, if you have to use third party link for backup, and you are not controlling the routers on the backup link.
	www.mikrotik.com /Documentation/manual_2.6/Routing/OSPF.html (2687 words)

	What is OSPF? - A Word Definition From the Webopedia Computer Dictionary (Site not responding. Last check: 2007-10-20)
		OSPF Version 2 is defined in RFC 1583.
		Describes the IETF OSPF working group and includes contact and mailing list information and links to Internet draft and Request for Commments documents.
		Examines how OSPF works and how it can be used to design and build today's large and complicated networks.
	www.webopedia.com /TERM/O/OSPF.html (350 words)

	OSPFD Resource Page (Site not responding. Last check: 2007-10-20)
		This is the resource page for the ospfd routing software, a complete annotated C++ implementation of the OSPF routing protocol.
		There is also support for several optional OSPF enhancements: The Multicast Extensions to OSPF (MOSPF, RFC 1584), OSPF's Demand Circuit extensions (RFC 1793), and OSPF Database Overflow (RFC 1765).
		With the first bug fix, the version number was incremented to 1.1, with the digits to the right of the decimal point referring to the patch level.
	www.ospf.org (137 words)

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