Cisco WS-C2980G-A Software Guide - Page 343
Using Ping, Understanding How Ping Works
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Chapter 20 Checking Status and Connectivity Using Ping telnet tim tim-nt.bigcorp.com * telnet suzy suzy-pc.bigcorp.com Console> (enable) disconnect console Console session disconnected. Console> (enable) disconnect tim-nt.bigcorp.com Telnet session from tim-nt.bigcorp.com disconnected. (1) Console> (enable) show users Session User Location telnet jake jake-mac.bigcorp.com * telnet suzy suzy-pc.bigcorp.com Console> (enable) Using Ping The next two sections describe how to use IP ping. Understanding How Ping Works You can use IP ping to test connectivity to remote hosts. To ping a host in a different IP subnetwork, you must define a static route to the network or configure a router to route between those subnets. The ping command is configurable from normal executive and privileged executive mode. In normal executive mode, the ping command supports the -s parameter, which allows you to specify the packet size and packet count. In privileged executive mode, the ping command allows you to specify the packet size, packet count, and the wait time. Table 20-1 lists the default values that apply to the ping-s command. Table 20-1 Ping Default Values Number of Packets Packet Size Wait Time Source Address Ping 5 56 2 Host IP Address Ping-s 0=continuous ping 56 2 - Ping will return one of the following responses: • Normal response-The normal response (hostname is alive) occurs in 1 to 10 seconds, depending on network traffic. • Destination does not respond-If the host does not respond, a no answer message is returned. • Unknown host-If the host does not exist, an unknown host message is returned. • Destination unreachable-If the default gateway cannot reach the specified network, a destination unreachable message is returned. • Network or host unreachable-If there is no entry in the route table for the host or network, a network or host unreachable message is returned. To stop a ping in progress, press Ctrl-C. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 20-9
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