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Types of Routes
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A router can learn a route using one of two methods: static and dynamic The following two sections discuss the two types
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Static Routes
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A router can learn a static route in two ways: First, a router will look at its active interfaces, examine the addresses configured on the interfaces and determine the corresponding network numbers, and populate the routing table with this information This is commonly called a connected or directly connected route The second way that a router can learn a static route is for you to configure it manually One special type of static route is called a default route, commonly called the gateway of last resort If the specified destination is not listed in the routing table, the default route can be used to route the packet A default route has an IP address of 0000 and a subnet mask of 0000, often represented as 0000/0 Default routes are commonly used in small networks on a perimeter router pointing to the directly connected ISP router The configuration of static and default routes is discussed in 19
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A router learns dynamic routes by running a routing protocol Routing protocols will learn about routes from other neighboring routers running the same routing protocol Dynamic routing protocols share network numbers known by the router and reachability information concerning these networks Through this sharing
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15: Routers and Routing
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TABLE 15-1
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Routing Protocols
RIP, IGRP, OSPF, EIGRP, BGP, IS-IS RIP, NLSP, EIGRP RMTP, AURP, EIGRP
Routed and Routing Protocols
process, a router will eventually learn about all of the reachable network and subnet numbers in the network You should know that the terms routing protocol and routed protocol have two different meanings A routing protocol learns about routes for a routed protocol A routed protocol is a layer 3 protocol, such as Transmission Control Protocol/Internet Protocol (TCP/IP) or Internetwork Packet Exchange (IPX) A routed protocol carries user traffic such as e-mail, file transfers, and web downloads Table 15-1 shows some common routed protocols and the routing protocols that they use This book focuses only on routing for IP traffic and covers the basics of the following dynamic IP routing protocols: Routing Information Protocol (RIP) v1 and v2 in 19, Open Shortest Path Remember the difference First (OSPF) in 20, and Enhanced between a routed protocol and a routing Interior Gateway Routing Protocol (EIGRP) in protocol 21
Autonomous Systems
Some routing protocols understand the concept of an autonomous system, and some do not An autonomous system (AS) is a group of networks under a single administrative control, which could be your company, a division within your company, or a group of companies An Interior Gateway Protocol (IGP) refers to a routing protocol that handles routing within a single autonomous system IGPs include RIP, EIGRP, OSPF, and Intermediate System-Intermediate System (IS-IS) An Exterior Gateway Protocol (EGP) handles routing between different autonomous systems Today, only one EGP is active: the Border Gateway Protocol (BGP) BGP is used to route traffic across the Internet backbone between different autonomous systems Not every routing protocol understands the concept of an AS An AS can provide distinct boundaries for a routing protocol, and thus provides some advantages For instance, you can control how far a network number is propagated by routers Plus, you can control what routes you will advertise to other autonomous systems and what routes you ll accept from these systems
Routing Introduction
To distinguish one autonomous system from another, an AS can be assigned a unique number from 1 to 65,535 The Internet Assigned Numbers Authority (IANA) is responsible for assigning these numbers Just like the public and private IP addresses defined in RFC 1918, there are public and private AS numbers If you will be connected to the Internet backbone, are running BGP, and want to accept BGP routes from the Internet, you will need a public AS number However, if you only need to break up your internal network into different systems, you can use private AS numbers Routing protocols that understand the concept of an AS are EIGRP, OSPF, IS-IS, and BGP RIP doesn t understand autonomous systems, while OSPF does; but OSPF doesn t require you to configure the AS number, whereas other protocols, such as EIGRP, do Cisco s CCNP certification spends a lot of time discussing autonomous systems and routing between them The CCNA exam focuses only on the basics of IGPs and routing within an AS
An autonomous system (AS) is a group of networks under a single administrative control Each AS is assigned
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