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Part V
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CHAPTERS
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19 20 Basic Routing OSPF Routing 21 EIGRP Routing
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Basic Routing
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CERTIFICATION OBJECTIVES
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1901 1902 1903 Static Routes Dynamic Routing Protocol Basics RIP
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19: Basic Routing
n 15, you read about routing protocols, including the different types and their advantages and disadvantagesYou performed a basic configuration of a router from the command-line interface (CLI) in 16 and Security Device Manager (SDM) in 18 This chapter covers the basic configuration of static routes and distance vector protocols, specifically the IP Routing Information Protocol (RIP) The section on RIP focuses on the basics of this protocol; advanced configuration of RIP is beyond the scope of this book However, by the end of the chapter, you ll be able to configure routers using static routes or a running RIP that will route traffic in a network between the router s interfaces
CERTIFICATION OBJECTIVE 1901
Static Routes
A static route is a manually configured route on your router Static routes are typically used in smaller networks and when few networks or subnets exist, or with WAN links that have little available bandwidth With a network that has hundreds of routes, static routes are not scalable, since you would have to configure each route and any redundant paths for that route on each router This section covers the configuration of static routes and some of the issues associated with them
Dynamic routing protocols are preferred over static routes when many networks or subnets exist in a network, since the con guration of static routes would be prone to miscon guration given
the number of destinations Static routes are typically used in small networks with few segments and little bandwidth, such as WAN links
Static Routes
Static Route Con guration
To configure a static route for IP, use one of these two commands:
Router(config)# ip route destination_network_# [subnet_mask] IP_address_of_next_hop_neighbor [administrative_distance] [permanent]
Router(config)# ip route destination_network_# [subnet_mask] interface_to_exit [administrative_distance] [permanent]
The first parameter that you must specify is the destination network number If you omit the subnet mask for the network number, it defaults to the Class A (255000), B (25525500), or C (2552552550) default subnet mask, depending on the network number of the destination After the subnet mask parameter, you can specify how to reach the destination network in one of two ways: you can tell the router the next hop neighbor s IP address or the interface the router should exit to reach the destination network You should use the former method if the link is a multi-access link (the link has more than two devices on it three routers, for instance) You can use the latter method if it is a point-to-point link In this instance, you must specify the name of the interface on the router, like so: serial0 Optionally, you can change the administrative distance of a static route If you omit this value, it will have one of two defaults, depending on the configuration of the previous parameter If you specified the next hop neighbor s IP address, then the administrative distance defaults to 1 If you specified the interface on the router it should use to reach the destination, the router treats the route as a connected route and assigns an administrative distance of 0 to it Note that you can create multiple static routes to the same destination For instance, you might have primary and backup paths to the destination For the primary path, use the default administrative distance value For the backup path, use a number higher than this, such as 2 Once you have configured a backup path, the router will use the primary path, and if the interface on the router fails for the primary path, the router will use the backup route The permanent parameter will keep the static route in the routing table even when the interface the router uses for the static route fails If you omit this parameter, and the interface used by the static route fails, the router will remove this route from its routing table and attempt to find an alternative path to place in the routing table
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