1. University of the Western Cape Chapter 12: Routing Protocols Interior and Exterior Routing Protocols Aleksandar Radovanovic

2. University of the Western Cape How a router learns about destinations Static routes -- manually defined by the system administrator as the next hop to a destination and are useful for security and traffic reduction Default routes -- manually defined by the system administrator as the path to take when there is no known route to the destination Dynamic routing -- the router learns of paths to destinations by receiving periodic updates from other routers

3. University of the Western Cape Static route configuration

4. University of the Western Cape Default route configuration ip default-network 192.168.17 default When an entry for a destination network does not exist in a routing table, the packet is sent to the default network.

5. University of the Western Cape Autonomous system An autonomous system consists of routers, run by one or more operators. The Network Information Center (NIC) assigns a unique autonomous system to enterprises. This autonomous system is a 16 bit number. A routing protocol such as Cisco's IGRP requires that you specify this unique, assigned autonomous system number in your configuration.

6. University of the Western Cape Interior versus exterior routing protocols Exterior routing protocols are used for communications between autonomous systems. Interior routing protocols are used within a single autonomous system (RIP, IGRP)

7. University of the Western Cape Interior IP routing protocols Examples of IP routing protocols include: RIP -- a distance-vector routing protocol IGRP -- Cisco's distance-vector routing protocol OSPF -- a link-state routing protocol EIGRP -- a balanced hybrid routing protocol

8. University of the Western Cape IP routing configuration tasks

9. University of the Western Cape Using the router and network commands The router command starts a routing process. The network command enables the routing process to determine which interfaces will participate in the sending and receiving of routing updates