CCNA4-RIP路由协议.ppt

WAN Connections Enabling RIP What Is a Routing Protocol? Routing protocols are used between routers to determine paths and maintain routing tables. After the path is determined, a router can route a routed protocol. Autonomous Systems: Interior or Exterior Routing Protocols Classes of Routing Protocols Administrative Distance: Ranking Routes Classful Routing Protocol Classful routing protocols do not include the subnet mask with the route advertisement. Within the same network, consistency of the subnet masks is assumed. Summary routes are exchanged between foreign networks. These are examples of classful routing protocols: RIPv1 IGRP Classless Routing Protocol Classless routing protocols include the subnet mask with the route advertisement. Classless routing protocols support a variable-length subnet mask (VLSM). Summary routes can be manually controlled within the network. These are examples of classless routing protocols: RIPv2 EIGRP OSPF IS-IS Distance Vector Routing Protocols Routers pass periodic copies of their routing table to neighboring routers and accumulate distance vectors Sources of Information and Discovering Routes Routers discover the best path to destinations from each neighbor. RIP Overview Maximum is 16 equal-cost paths (default = 4) Hop-count metric selects the path Routes update every 30 seconds RIPv1 and RIPv2 Comparison IP Routing Configuration Tasks Router configuration Select routing protocols Specify networks or interfaces RIP Configuration Starts the RIP routing process RIP Configuration Example Verifying the RIP Configuration Displaying the IP Routing Table debug ip rip Command Summary Routing is the process by which items get from one location to another. Dynamic routing protocols determine how updates are conveyed, what knowledge is conveyed, when to convey knowledge, and how to locate recipients of the updates. A routing protocol that has a lower administrative value is more trustworthy than a protocol that has a higher adminis