Link state protocol concepts
Ospf routing protocol this section covers the open shortest path first ( ospf ) protocol we analyse the ospf protocol, explaining why the ospf protocol exists, how ospf works, ospf concepts, ospf areas, ospf router roles and much more. Chapter 3- routing protocols and concepts shared flashcard set details title which of the following is associated with link-state routing protocols definition shortest-path first calculations: term 10 why is fast convergence desirable in networks that use dynamic routing protocols the cost for this link has a value of 129 term. Link state routing protocols build a complete topology of the entire network are and then calculating the best path from this topology of all the interconnected networks it requires. Link-state protocols do not “route by rumor” instead, routers send updates instead, routers send updates advertising the state of their links (a link is a directly-connected network. Link-state routing protocols are faster to converge than distance vector routing protocols distance vector routing protocols are easier to implement than link-state routing protocols distance vector routing algorithms do not calculate the exact topology of a network.
In link-state protocols, the link part of the protocol is the interface on the router, while the state is how it relates to its neighbors, which would include its address and network information before you get started, check out this short list of terms used in this section. Link state routing protocols operate differently routers send information about the state of their links to the entire network (or area) that they are a part of routers send information about the state of their links to the entire network (or area) that they are a part of. Link state routing protocols maintain complete road map of the network in each router running a link state routing protocol each router running a link state routing protocol originates information about the router, its directly connected links, and the state of those links. There are two major classes of routing protocol: distance vector and link-state it's easy to remember which protocols belong to either class, but comprehending the differences between the two classes takes a bit more effort.
The enhanced interior gateway routing protocol (eigrp) eigrp integrates the capabilities of link-state protocols into distance vector protocols additionally, eigrp contains several important protocols that greatly increase its operational efficiency relative to other routing protocols eigrp relies on four fundamental concepts. Lacp, a subcomponent of ieee 8023ad, provides additional functionality for link aggregation groups (lags) use the link aggregation feature to aggregate one or more ethernet interfaces to form a logical point-to-point link, known as a lag, virtual link, or bundle the mac client can treat this. The ospf protocol is based on link-state technology, which is a departure from the bellman-ford vector based algorithms used in traditional internet routing protocols such as rip ospf has introduced new concepts such as authentication of routing updates, variable length subnet masks (vlsm), route summarization, and so forth. Link state protocols have introduced the concept of multiple routing areas withing the same routing domain link state protocols depend on the fact that all routers must have an identical link state database and then each router will start calculating its very own routing table from this information.
Routing basics from docwiki this article introduces the underlying concepts widely used in routing protocols topics summarized here include routing protocol components and algorithms in addition, the role of routing protocols is briefly contrasted with the role of routed or network protocols guide contents a link-state. In many ways, the link-state process is simpler to understand than distance vector concepts link-state routing protocol operation (341) this section describes the characteristics, operations, and functionality of link-state routing protocols with link-state routing protocols, a link is an interface on a router information about the. Linkstate update packet (lsu) : the linkstate update packet is the packet containing detailed information about an entry in a neighboring ospf router's linkstate database the packet is the response from a lsr (linkstate request) packet.
Reliable flooding each router transmits a link state packet (lsp) on all links a neighboring router forwards out all links except incoming » keep a copy locally don’t forward previously-seen lsps challenges packet loss out-of-order arrival solutions acknowledgments and retransmissions sequence numbers time-to-live for each packet. Ospf is a link-state routing protocol which allows a as to be split into areasthe ospf link state database provides the complete map of an area at each router by adding a new type of link state advertisement group-membership-lsa (group-membership link state advertisement) the information about the location of members of multicast groups can. Link state protocols track the status and connection type of each link and produces a calculated metric based on these and other factors, including some set by the network administrator link state protocols know whether a link is up or down and how fast it is and calculates a cost to 'get there. Link-state routing protocols create a topological map, or spf tree of the network topology distance vector routing protocols do not have a topological map of the network.
Link state protocol concepts
Link-state protocols use multicast to send informationa about network topology eigrp is a advanced distance vector routing protocol it has some features of distance vector and link state routing protocol initially it was a cisco proprietary now it is open standard. Link state protocols are much more complex and require more processing power and memory, but as the resources in routers improved over time, link state routing protocols slowly took over nowadays, we have extremely fine routing protocol implementations from both worlds - eigrp is a state-of-the-art distance vector routing protocol, while in. Distance vector vs link state routing protocols routing protocols such as rip and eigrp are distance vector routing protocols these are called distance vector protocols because they base routing decisions on the “distance” of the remote destination in terms of the number of network layer hops that the packet will have to traverse. Routing metrics and costs metrics are cost values used by routers to determine the best path to a destination network several factors help dynamic routing protocols decide which is the preferred or shortest path to a particular destination.
A tutorial on the differences of distance vector and link-state routing protocols for the cisco ccna . Interior gateway protocols type 1, link-state routing protocols, such as ospf and is-is interior gateway protocols type 2, distance-vector routing protocols , such as routing information protocol , ripv2 , igrp. Compared with link-state protocols, distance vector protocols have a higher risk of causing routing loops the only modern routing protocol that is traditionally distance vector is rip it advertises a complete copy of its routing table every 30 seconds via all enabled interfaces. Routing protocols and concepts ccna2 chapter 4 distance vector routing protocols or more routers have inaccurate routing information to a destination network issue with distance vector routing protocols but not link-state the loop can be a result of: incorrectly configured static routes incorrectly configured route.
Routers and layer 3 switches add ip routes to their routing tables using three methods: connected routes, static routes, and routes learned by using dynamic routing protocols the routing process forwards ip packets, but if a router does not have any routes in its ip routing table that match a. Link state protocols know more about the internetwork than distance vectors protocols, as they update routers about the state of their own links ( source: todd lammie, network + deluxe study guide 2nd ed , sibex, 2014 .