In dynamic routing, we’ll change a routing protocol on router. This protocol can send its routing info to the neighbour router. The neighbors can analyze the information and write new routes to the routing table. The routers can pass routing information receive from one router to different router additionally. If there are quite one
path out there then routes are compared and best path is chosen. Some samples of dynamic protocol are: –
RIP, IGRP, EIGRP, OSPF
Routing protocols may be classified into completely different teams consistent with their characteristics. Specifically, routing protocols may be classified by their:
Purpose: Interior entree Protocol (IGP) or Exterior entree Protocol (EGP)
Operation: Distance vector protocol, link-state protocol, or path-vector protocol
Behavior: Classful or democratic protocol
An autonomous system (AS) may be a assortment of routers (networks) beneath a typical administration domain like a corporation or a corporation. AN AS is additionally referred to as a routing domain. Typical samples of AN AS are a company’s internal network and an ISP’s network.
The Internet relies on the AS concept; so, 2 varieties of routing protocols are required:
Interior entree Protocols (IGP): Used for routing among AN AS. it’s additionally stated as intra-AS routing. Companies, organizations, ANd even service suppliers use an IGP on their internal networks. IGPs embrace RIP, EIGRP, OSPF, and IS-IS.
Exterior entree Protocols (EGP): Used for routing between autonomous systems. it’s additionally stated as inter-AS routing. Service suppliers and huge firms could interconnect mistreatment AN EGP. The Border entree Protocol (BGP) is that the solely presently viable EGP and is the official routing protocol utilized by the net.
The example in Figure provides straightforward eventualities highlight the readying of IGPs, BGP, and static routing.
There are 5 individual autonomous systems within the scenario:
ISP-1: this can be AN AS and it uses IS-IS because the IGP. It interconnects with different autonomous systems and repair suppliers mistreatment BGP to expressly management however traffic is routed.
ISP-2: this can be AN AS and it uses OSPF because the IGP. It interconnects with different autonomous systems and repair suppliers mistreatment BGP to expressly management however traffic is routed.
AS-1: this can be an outsized organization and it uses EIGRP because the IGP. as a result of it’s multihomed (i.e., connects to 2 completely different service providers), it uses BGP to expressly management however traffic enters and leaves the AS.
AS-2: this can be a medium-sized organization and it uses OSPF because the IGP. it’s additionally multihomed; so, it uses BGP to expressly management however traffic enters and leaves the AS.
AS-3: this can be atiny low organization with older routers among the AS; it uses RIP because the IGP. BGP isn’t needed as a result of it’s single-homed (i.e., connects to 1 service provider). Instead, static routing is enforced between the AS and therefore the service supplier.
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