H3C S3610 Series Operation Manual

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Operation Manual – System Maintenance and DebuggingH3C S3610&S5510 Series Ethernet Switches Chapter 2 System Maintaining and Debugging2-2z The statistics from execution of the command, which include number of sentpackets, number of received ECHO-REPLY packets, percentage of packets thatwere not received, the minimum, average, and maximum response time.II. The tracert commandUsers can use the tracert command to trace the routers used while forwarding packetsfrom the source to the destination device. In the event of network failure, users canidentify the failed node(s) in this way.Take the following steps when using the tracert command:1) The source device sends a packet with a TTL value of 1 to the destination device.2) The first hop (the router that has received the packet first) responds by sending aTTL-expired ICMP message with its IP address encapsulated to the source. In thisway, the source device can get the address of the first router.3) The source device sends a packet with a TTL value of 2 to the destination device.4) The second hop responds with a TTL-expired ICMP message, which gives thesource device the address of the second router.5) The above process continues until the ultimate destination device is reached. Inthis way, the source device can trace the addresses of all the routers that havebeen used to get to the destination device.2.1.2 Introduction to System DebuggingFor the majority of protocols and new features provided, the system generally providesthe related debugging functions to enable users to diagnose errors.The following two functions control the debugging information display.z Protocol debugging switch, which controls protocol specific debugging informationz Screen output function, which controls whether the debugging information isoutput on a certain screenFigure 2-1 illustrates the relationship between the protocol debugging switch and thescreen output switch. Only when both are turned on can debugging information beoutput on a terminal.