An internal router is a router that has OSPF neighbor relationships with interfaces in the same area.

* IF a HIGHER priority OSPF router comes online AFTER the election has taken place, it will not become DR or BDR until ( at least ) the DR and BDR fail.

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.

* For each interface on which no DR has been elected, OSPF refers to these subnets as stub networks.

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

BFD's operation in conjunction with Open Shortest Path First ( OSPF ) and IS-IS protocols has also been outlined in RFC 5881.

While the papers describing HSLS do not focus on security, techniques such as digital signatures on routing updates can be used with HSLS ( similar to OSPF with Digital Signatures ), and BBN has implemented HSLS with digital signatures on neighbor discovery messages and link state updates.

Given the same set of resources, IS-IS can support more routers in an area than OSPF.

* If the priority setting on an OSPF router is set to 0, that means it can NEVER become a DR or BDR ( Backup Designated Router ).

MPLS Traffic Engineering relies upon the use of TE extensions to Open Shortest Path First ( OSPF ) or Intermediate System To Intermediate System ( IS-IS ) and RSVP.

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.

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

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.

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.

An example would be the joining of a number of large OSPF ( Open Shortest Path First ) networks where OSPF by itself would not scale to size.

Like the OSPF protocol, IS-IS uses Dijkstra's algorithm for computing the best path through the network.

IS-IS was developed at roughly the same time that the Internet Engineering Task Force IETF was developing a similar protocol called 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.

OSPF, on the other hand, was designed for IPv4.

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 logical view is that OSPF creates something of a spider web or star topology of many areas all attached directly to Area Zero and IS-IS by contrast creates a logical topology of a backbone of Level 2 routers with branches of Level 1-2 and Level 1 routers forming the individual areas.

IS-IS also differs from OSPF in the methods by which it reliably floods topology and topology change information through the network.

OSPF uses the Dijkstra algorithm.

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

It is defined as OSPF Version 2 in RFC 2328 ( 1998 ) for IPv4.

OSPF is perhaps the most widely used interior gateway protocol ( IGP ) in large enterprise networks.

OSPF was designed to support variable-length subnet masking ( VLSM ) or Classless Inter-Domain Routing ( CIDR ) addressing models.

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

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

The OSPF routing policies to construct a route table are governed by link cost factors ( external metrics ) associated with each routing interface.

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

To raise the dancer out of his personal, pedestrian self, Mr. Nikolais has experimented with relating him to a larger, environmental orbit.

`` Selective selling '' -- concentrating sales on the larger accounts -- has been used effectively by some manufacturers.

`` The human ego being what it is '', I put in, `` science fiction has always assumed that the creatures on the planets of a thousand larger solar systems than ours must look like gigantic tube-nosed fruit bats.

When a word represents a larger construction of which it is the only expressed part, it normally has more stress than it would have in fully expressed construction.

On the other hand, looking at the larger picture, is it true that pupil assignment has effectively cut off, blocked, or reduced school desegregation to a `` trickle ''??

The care of offspring among amphibians has been little studied but in general, the larger the number of eggs in a batch, the less likely it is that any degree of parental care takes place.

In the wider sense, an alphabet is a script that is segmental at the phoneme level — that is, it has separate glyphs for individual sounds and not for larger units such as syllables or words.

He thinks only of his own personal happiness and the unfairness of the situation in which he has been placed but gradually comes to recognize his membership in a larger human community, which makes demands on him that he cannot ignore.

This can be attributed to progress in computing technology, which has allowed larger and more sophisticated models of atomic structure and associated collision processes.

Cysteine is unusual since it has a sulfur atom at the second position in its side-chain, which has a larger atomic mass than the groups attached to the first carbon, which is attached to the α-carbon in the other standard amino acids, thus the ( R ) instead of ( S ).

It has a far larger meaning and mission in that it calls for restoration of the focus of medicine on health and healing and emphasizes the centrality of the patient-physician relationship.

* Swearingen Jr., William Scott Environmental City: People, Place, and the Meaning of Modern Austin ( University of Texas Press ; 2010 ) 273 pages ; traces the history of environmentalism in the Texas capital, which has been part of a larger effort to preserve Austin's quality of life and sense of place.

An alternate explanation of the red fox's gains involves the gray wolf: Historically, it has kept red fox numbers down, but as the wolf has been hunted to near extinction in much of its former range, the red fox population has grown larger, and it has taken over the niche of top predator.

Although it has only 6. 14 percent of Alaska's land area, it is larger than the state of Maine, and almost as large as the state of Indiana.

Under the Local Government Act 1972, since 1974, the town has formed part of the larger Borough of Hyndburn including the former Urban Districts of Oswaldtwistle, Church, Clayton-le-Moors, Great Harwood and Rishton.

With the advent of steel, which has a high tensile strength, much larger bridges were built, many using the ideas of Gustave Eiffel.

* Vasconic substratum hypothesis: This proposal, by the German linguist Theo Vennemann, claims that there is enough toponymical evidence to conclude that Basque is the only survivor of a larger family that once extended throughout most of Europe, and has also left its mark in modern Indo-European languages spoken in Europe.

Although the use of aircraft has for the most part always been used as a supplement to land or naval engagements, since their first major military use in World War I aircraft have increasingly taken on larger roles in warfare.

Trophy hunting has the potential to provide economic justification for the preservation of larger areas of bongo habitat than national parks, especially in remote regions of Central Africa where possibilities for commercially successful tourism are very limited ( Wilkie and Carpenter 1999 ).

The Rain Quail has a black breast, lives in Asia, and is larger.

It has been argued by John Mosier that, while the French soldiers in 1940 were better trained than German soldiers, as were the Americans later, and the German army was the least mechanised of the major armies, its leadership cadres were both larger and superior and their high standards of leadership were the primary reason for the successes of the German army in World War Two as it had been in World War One.