Serial0/0/0 không tắt máy địa chỉ ip không công bằng-hàng đợi! giao diện Serial0/0/1 không tắt máy địa chỉ ip! giao diện Serial0/1/0 không tắt máy địa chỉ ip! giao diện Serial0/2/0 ip không có địa chỉ tắt máy đồng hồ tốc độ 2000000 cắt giảm sản lượngVì lợi ích ngắn gọn, | 272 Chapter 4 Configure verify and troubleshoot basic router operation route command is a good troubleshooting command for verifying your routing table and the show interfaces command will show you the status of each interface. I am going to go over both the debug command and the show processes command you need to troubleshoot a router. Using the ping Command So far you ve seen many examples of pinging devices to test IP connectivity and name resolution using the DNS server. To see all the different protocols that you can use with the ping program type ping Corp ping WORD Ping destination address or hostname clns CLNS echo ip IP echo srb srb echo tag Tag encapsulated IP echo cr The ping output displays the minimum average and maximum times it takes for a ping packet to find a specified system and return. Here s an example Corp ping R1 Translating R1 .domain server OK Type escape sequence to abort. Sending 5 100-byte ICMP Echos to timeout is 2 seconds Success rate is 100 percent 5 5 round-trip min avg max 1 2 4 ms Corp You can see that the DNS server was used to resolve the name and the device was pinged in 1 ms millisecond an average of 2 ms and up to 4 ms. The ping command can be used in user and privileged mode but not configuration mode. Verify router hardware and software operation using the SHOW and DEBUG 273 Pinging with SDM Unlike the Telnet option in SDM we at least have a screen we can use to choose an option or two. Once you choose Tools Ping you receive the following screen 274 Chapter 4 Configure verify and troubleshoot basic router operation From here you can choose the source interface to ping from which is a nice option. Enter your destination and then click Ping. Using the traceroute Command Traceroute the traceroute command or trace for short shows the path a packet takes to get to a remote device. It uses time to live TTL time-outs and ICMP error messages to outline the path a packet takes through an internetwork to .
