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3.1 | ![]() |
Routing | |
3.1.1 | ![]() |
Routing fundamentals |
One of the primary jobs of a router is to determine the best path to a given destination. A router learns paths, or routes, from the static configuration entered by an administrator or dynamically from other routers, through routing protocols. Routers keep a routing table in RAM. A routing table is a list of the best known available routes. Routers use this table to make decisions about how to forward a packet. Issue the show ip route command to view the TCP/IP routing table.![]() A routing table maps network prefixes to an outbound interface.
The first few lines in Figure
Administratively defined routes are referred to as static routes
because they do not change until a network administrator manually
programs the changes.
The following sections describe how to configure both static and dynamic routing on a Cisco router.
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