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ccna practical cisco routers phần 9

Ví dụ, mạng con đầu tiên sẽ chứa tất cả các địa chỉ 10.8.0.1 và 10.16.0.1 (nhưng không bao gồm AARP (AppleTalk Address Resolution Protocol) Một lớp mạng giao thức giải quyết AppleTalk mạng địa chỉ đến các địa chỉ phần cứng. | PART IV Ad vanced Configuration and Configuration To o l s CHAPTER 18 Basic Router Tr o u b l e s ho o t i n g Some of the high-end Cisco routers actually have complex cooling systems and also enable you to monitor the temperature of the device. FIGURE 18.2 The show controller command can be used to view sta -tistics related to the controllers installed on the router. In cases where the router crashes it can be tough to determine if the problem was hardware- or software-related. You can use the show stacks command to retrieve error messages that were saved by the ROM monitor at the time of the crash. Cisco technical support representatives can use the show stacks information to pinpoint the software or hardware problem that caused the crash . Besides the physical failure of router components you might also run into situations where the router doesn t have enough RAM or processor speed to really handle all the traffic that you have flowing through it. You might need to add additional routers to the internetwork to lighten the load or upgrade existing router hardware components such as RAM . In some cases you might want to upgrade from the existing router to a higher-end router. One way that network administrators identify bottlenecks on their networks a bottleneck is a device that is slowing network traffic is to use some type of network management software package that allows the monitoring of devices protocols and other aspects of the network and enables you to view the current health of your internetwork. CiscoWorks is an example of a network management software 304 PART IV Troubleshooting Hardware Problems CHAPTER 18 package that provides a number of tools for monitoring and troubleshooting internetworks. On large internetworks some sort of network management software is vital for keeping tabs on the network and its various devices. Other Hardware Problems Other hardware problems that will affect the job that your router is doing relate to devices that are .