Drawbacks of static route Dynamic Routing Concepts Distance Vector Link State Path Selection

2.  Directly Connected Network
 Router discard unknown destinations
 Static Routing: benefits and drawbacks
 Dynamic Routing
 Routing Metrics/Cost/Distance
 Metric Parameters
Bandwidth, Delay, Load, No. of Hops and
Reliability

3.  Dynamic Concept of operation: exchange
information
 Learn networks and all possible paths
 Choose best path (route)
 Any protocol advertise routes equal to Directly
connected1 + Learned routes2
1 Directly connected: only enabled in protocol
2 Learned routes: only learned by the same
protocol

4.  Autonomous System (AS)
 Interior Gateway Protocol (IGP)
 Exterior Gateway Protocol (EGP)
 Each AS can be assigned a number called (ASN)
 Public ASN assigned by regional organization
under control of IANA
 Private ASN: 64,512 to 65,534

5.  IGP: Routing information exchange between
routers of the same Autonomous system
 Distance Vector
 Link State
 RIP
 IGRP
 OSPF
 IS-IS
 Hybrid
 EIGRP

6.  Periodic update
 Neighbor relationship
 Whole routing table
 Low Convergence
 Link utilization
 RIPv1 RIPv2 and IGRP

7.  Entire routers relationship
 Partial / Full update
 Event trigger
 Fast convergence
 Better links utilization
 OSPF and IS-IS

8.  Run the protocol (RIP, OSPF, EIGRP)
Router(config)# router protocol-name
 Activate interfaces in protocol process and add its
network in related updates
Router(config-router)# network networkID

9.  Topology Changes
 Passive Interface
 Redistribution Concept
 Equal Cost Load Balancing