计算机网络（第六版）课件路由协议知识讲稿.ppt

* * * * * * * Router status commands are as follows: show version桪isplays the configuration of the system hardware, the software version, the names and sources of configuration files, and the boot images. show processes桪isplays information about the active processes. show protocols桪isplays the configured protocols. This command shows the status of any configured Layer 3 (network) protocol. show mem桽hows statistics about the router抯 memory, including memory free pool statistics. show stacks桵onitors the stack use of processes and interrupt routines and displays the reason for the last system reboot. show buffers桺rovides statistics for the buffer pools on the network server. show flash桽hows information about the Flash memory device. show running-config (write term on Cisco IOS Release 10.3 or earlier)桪isplays the active configuration file. show startup-config (show config on Cisco IOS Release 10.3 or earlier)桪isplays the backup configuration file. show interfaces桪isplays statistics for all interfaces configured on the router. * Purpose: This figure illustrates typical company sites. Emphasize: This class will focus on how to connect three sites: a central site, a branch office, and a small site. Familiarize students with the multiple terms that are used to reference the various sites. Analogy: At Cisco Systems, the headquarters site in San Jose is a central site example. Likewise, branch offices that house many SEs are located in most major cities. Employees who work from home are considered telecommuters. When employees travel on business, they must dial in from remote locations to check their e-mail. In this course, they are referred to as remote telecommuters. Transition: The following three figures describe typical considerations at each company site. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Interdomain Loop Prevention BGP at AS YYY will never accept a route with ASPATH containing YYY. AS 7018 /16 A