The ping command is a useful test available on Cisco internetworking devices as well as on many host systems. In TCP/IP, this diagnostic tool is also known as an Internet Control Message Protocol (ICMP) Echo Request.
Note The ping command is particularly useful when high levels of input errors are being registered in the show interfaces serial display. See Figure 15-1.
Cisco internetworking devices provide a mechanism to automate the sending of many ping packets in sequence. Figure 15-5 illustrates the menu used to specify extended ping options. This example specifies 20 successive pings. However, when testing the components on your serial line, you should specify a much larger number, such as 1000 pings.
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