Where Are OSPF Protocols Used?

What is the OSPF process ID?

The router ospf process-id command is the beginning of any Cisco IOS OSPF configuration.

When configuring OSPF, process-id is used as an identifier of the local OSPF process; different OSPF process IDs would be used on the same router if multiple independent OSPF processes were being run on the same device..

What port does OSPF use?

RIP uses the User Datagram Protocol (UDP) as its transport protocol, and is assigned the reserved port number 520. Open Shortest Path First (OSPF) is a link-state routing protocol. OSPF does not use a TCP/IP transport protocol (UDP, TCP), but is encapsulated directly in IP datagrams with protocol number 89.

Why rip is Layer 7 protocol?

RIP is an Application Layer protocol. The application that is using the protocol is the RIP routing process / application on each router. An application layer protocol will still rely upon lower layers (Transport, Network, Data Link and Physical) to help deliver the Application data.

Why do we use AREA 0 in OSPF?

Area 0 was chosen to be the backbone, the number 0 or 0.0. 0.0 is just a number. Because OSPF is link state the LSDB must be identical within an area. This is to ensure that the SPF calculation is consistent and to prevent routing loops.

What is Area 0 called in OSPF?

backbone areaThe backbone area (Area 0) is the core of an OSPF network. All other areas are connected to it and all traffic between areas must traverse it. All routing between areas is distributed through the backbone area.

Why is OSPF divided into areas?

In OSPF, a single autonomous system (AS) can be divided into smaller groups called areas. This reduces the number of link-state advertisements (LSAs) and other OSPF overhead traffic sent on the network, and it reduces the size of the topology database that each router must maintain.

Is BGP a Layer 3?

BGP is the path-vector protocol that provides routing information for autonomous systems on the Internet via its AS-Path attribute. BGP is a Layer 4 protocol that sits on top of TCP. It is much simpler than OSPF, because it doesn’t have to worry about the things TCP will handle.

What kind of protocol is OSPF?

routing protocolOpen Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateway protocols (IGPs), operating within a single autonomous system (AS). It is defined as OSPF Version 2 in RFC 2328 (1998) for IPv4.

What are OSPF areas?

An OSPF network can be divided into sub-domains called areas. An area is a logical collection of OSPF networks, routers, and links that have the same area identification. A router within an area must maintain a topological database for the area to which it belongs.

Is OSPF a layer 3 protocol?

At Layer 3, routers will use dynamic routing protocols (generally Open Shortest Path First or OSPF and BGP in most enterprises) to present a robust network that handles site-to-site link failures and minimizes the burden of IP management.

What is the main purpose of OSPF?

The OSPF (Open Shortest Path First) protocol is one of a family of IP Routing protocols, and is an Interior Gateway Protocol (IGP) for the Internet, used to distribute IP routing information throughout a single Autonomous System (AS) in an IP network.

Is Rip a TCP or UDP?

RIP uses the User Datagram Protocol (UDP) as its transport protocol, and is assigned the reserved port number 520.

Is OSPF open standard?

The Open Shortest Path First (OSPF) protocol is a link state protocol that handles routing for IP traffic. Its newest implementation, version 2, which is explained in RFC 2328, is an open standard. Open Shortest Path First (OSPF) is an open standard (not proprietary) and it will run on most routers independent of make.

How does OSPF cost work?

Open Shortest Path First (OSPF) uses “Cost” as the value of metric and uses a Reference Bandwidth of 100 Mbps for cost calculation. The formula to calculate the cost is Reference Bandwidth divided by interface bandwidth. For example, in the case of 10 Mbps Ethernet , OSPF Metric Cost value is 100 Mbps / 10 Mbps = 10.

What is classless protocol?

Classless routing protocols do send the subnet mask with their updates. Thus, Variable Length Subnet Masks (VLSMs) are allowed when using classless routing protocols. Examples of classful routing protocols include RIPv1 and IGRP. Examples of classless routing protocols include RIPv2, EIGRP, OSPF, and IS-IS.

What are the benefits of OSPF protocol?

OSPF supports/provides/advantages –Both IPv4 and IPv6 routed protocols.Load balancing with equal cost routes for same destination.VLSM and route summarization.Unlimited hop counts.Trigger updates for fast convergence.A loop free topology using SPF algorithm.Run on most routers.Classless protocol.

Does OSPF use TCP or UDP?

OSPF Packets Because OSPF does not use UDP or TCP, the OSPF protocol is fairly elaborate and must reproduce many of the features of a transport protocol to move OSPF messages between routers.

Is OSPF Classful or classless?

Classful routing protocols do not carry subnet masks; classless routing protocols do. Older routing protocols, including RIP and IGRP, are classful. Newer protocols, including RIP-2, EIGRP, and OSPF, are classless.

Which layer is OSPF?

data link layerOSI layer designation IS-IS runs on the data link layer (Layer 2) Open Shortest Path First (OSPF) is encapsulated in IP, but runs only on the IPv4 subnet, while the IPv6 version runs on the link using only link-local addressing. IGRP, and EIGRP are directly encapsulated in IP.

Is OSPF distance vector?

OSPF is not a distance-vector protocol like RIP, but a link-state protocol with a set of metrics that can be used to reflect much more about a network than just the number of routers encountered between source and destination. In OSPF, a router attempts to route based on the “state of the links.”