Dynamic Routing

                                                   DYNAMIC ROUTING

In dynamic routing, we use a routing protocol.in dynamic routing protocol is responsible for defining the path to reach the destination.The routing table is automatically created by routing protocol.Dynamic routing is a single routing technique which uses multiple ad (admin distance) number because in dynamic routing we have multiple routing protocols and each routing protocol has unique or pre-defined ad number.

Dynamic Routing
Eg.
         PROTOCOL                      AD Number
         RIP                                      120
         IGRP                                    100
         EIGRP                                  90
          OSPF                                   110
          IS-IS                                    115
                                 BGP
                     IBGP                 EBGP
                     200                     20
Routing protocol are divided into two parts
  1. IGP (INTERIOR GATEWAY PROTOCOL)
Eg. Rip, Igrp, Eigrp, Ospf, Is-is
      2. EGP (EXTERIOR GATEWAY PROTOCOL)
Eg. BGP.
       
IGP PROTOCOL: - IGP protocol performs the function within an AS (autonomous system ) and in a single, AS we use a single IGP routing protocol.
AS: - AUTONOMOUS SYSTEM - it is a 16-bit logical number.And it define the group of router  
                                               Limit of AS - 65536    

All routing protocol  use two concepts to define the path to reach the destination
  1. DVP (DISTANCE VECTOR PROTOCOL) It mean DVP protocol use hop count (hop count means router counting)to define the path to reach the destination      
            DVP PROTOCOLS: - RIP, IGRP.
      2. LINK-STATE: - Link-state routing protocol use cost to define the path to reach the destinations.
      LINK-STATE PROTOCOL: - OSPF
    
     EIGRP AND IS-IS protocol is a hybrid routing protocol .it is a mixture of a both concepts

     Eg. DVP + LINK-STATE.

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