Dijkstra's algorithm is used in SPF, Shortest Path First, which is used in the routing protocols OSPF and IS-IS.

Interior routing mostly uses link-state routing protocols such as OSPF and IS-IS.

Open Shortest Path First ( OSPF ) is an adaptive routing protocol for Internet Protocol ( IP ) networks.

OSPF is an interior gateway protocol that routes Internet Protocol ( IP ) packets solely within a single routing domain ( autonomous system ).

OSPF detects changes in the topology, such as link failures, very quickly and converges on a new loop-free routing structure within seconds.

An OSPF network may be structured, or subdivided, into routing areas to simplify administration and optimize traffic and resource utilization.

For routing multicast IP traffic, OSPF supports the Multicast Open Shortest Path First protocol ( MOSPF ) as defined in RFC 1584.

The OSPF protocol, when running on IPv4, can operate securely between routers, optionally using a variety of authentication methods to allow only trusted routers to participate in routing.

As a link state routing protocol, OSPF establishes and maintains neighbor relationships in order to exchange routing updates with other routers.

OSPF uses path cost as its basic routing metric, which was defined by the standard not to equate to any standard value such as speed, so the network designer could pick a metric important to the design.

RFC 3717 documents work in optical routing for IP, based on " constraint-based " extensions to OSPF and IS-IS.

In most current networking environments, RIP is not the preferred choice for routing as its time to converge and scalability are poor compared to EIGRP, OSPF, or IS-IS ( the latter two being link-state routing protocols ), and ( without RMTI ) a hop limit severely limits the size of network it can be used in.

As a result, the shortest path first is widely used in network routing protocols, most notably IS-IS and OSPF ( Open Shortest Path First ).

These avoid loop formation in all cases, but suffer from increased complexity, and their deployment has been slowed down by the success of link-state routing protocols such as OSPF.

Examples of link-state routing protocols include OSPF and IS-IS.

The technique was later adapted for use in the contemporary link-state routing protocols IS-IS and OSPF.

However, it does synchronize routing tables at start up as OSPF does, and sends specific updates only when topology changes occur.

* A OSPF totally stubby area is one which only has a default route to the rest of the OSPF routing domain.

Other routing protocols such as Open Shortest Path First ( OSPF ) and Enhanced Interior Gateway Routing Protocol ( EIGRP ) only send updates when a connection changes.

PNNI uses the same shortest-path-first algorithm used by OSPF and IS-IS to route IP packets to share topology information between switches and select a route through a network.

While OSPF is natively built to route IP and is itself a Layer 3 protocol that runs on top of IP, IS-IS is natively an OSI network layer protocol ( it is at the same layer as CLNS ).

OSPF uses multicast addressing for route flooding on a broadcast network link.

* An OSPF stubby area is one which receives routes from other areas in the OSPF domain but for external routes, which are communicated via a Type 5 Link-state advertisement, the stubby area is only aware of a default route

A lower numerical value is preferred, e. g. an OSPF route with an administrative distance of 110 will be chosen over a RIP route with an administrative distance of 120.

The neighbor relationship table is called an adjacency database in OSPF.

Examples of adaptive-routing algorithms are the Routing Information Protocol ( RIP ) and the Open-Shortest-Path-First protocol ( OSPF ).

Both IS-IS and OSPF are link state protocols, and both use the same Dijkstra algorithm for computing the best path through the network.

IS-IS differs from OSPF in the way that " areas " are defined and routed between.

In OSPF, areas are delineated on the interface such that an area border router ( ABR ) is actually in two or more areas at once, effectively creating the borders between areas inside the ABR, whereas in IS-IS area borders are in between routers, designated as Level 2 or Level 1-2.

The updates for IPv6 are specified as OSPF Version 3 in RFC 5340 ( 2008 ).

Identical copies of the LSDB are periodically updated through flooding on all OSPF routers.

An OSPF domain is divided into areas that are labeled with 32-bit area identifiers.

Several vendors ( Cisco, Juniper, Alcatel-Lucent, Huawei, Quagga ), now implement the below two extensions to stub and NSSA area and although not covered by RFC they are considered by many to be standard features in OSPF implementations.

In such a case, the ASBR does send externals into the totally stubby area, and they are available to OSPF speakers within that area.

Backbone routers are all routers that are connected to the OSPF backbone, irrespective of whether they are also area border routers or internal routers of the backbone area.

DRs and BDRs are always setup / elected on OSPF broadcast networks.

The " Main OSPF Packet Header " is the same for all 5 types of packets ( with exception of the Type field ) whereas the following sub-headers will vary from type to type and are shown below the Main OSPF Packet Header.

While starting up, CUWiN relies on Dijkstra's Open Shortest Path First ( OSPF ), though they are in the process of implementing a much more amenable routing protocol named Hazy-Sighted Link State ( HSLS ), and then, later, implementing a modification to it named Adaptive Hazy-Sighted Link State ( A-HSLS ).

Instead, OSPF adjacencies are created and destroyed as a function of MANET information that is distributed by the NTDR routers, both cluster heads and cluster members.

Long before anoNet reaches that number of routers the network will have to be split into OSPF clouds, or switched to a completely different routing protocol or alter the BGP protocol to use a 32bit integer for ASNs, like the rest of the Internet will do, since 32-bit AS numbers now are standardised.

Raw sockets are typically available in network equipment, and used for routing protocols such as the Internet Group Management Protocol ( IGMP ) and Open Shortest Path First ( OSPF ), and in the Internet Control Message Protocol ( ICMP, best known for the ping suboperation ).

In a network injection attack, a cracker can make use of access points that are exposed to non-filtered network traffic, specifically broadcasting network traffic such as “ Spanning Tree ” ( 802. 1D ), OSPF, RIP, and HSRP.