CLI Reference Guide-R07

Chapter 27 | IP Interface Commands
IPv4 Interface
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devices respond correctly to probes by returning an “ICMP port unreachable”
message. If the timer goes off before a response is returned, the trace function
prints a series of asterisks and the “Request Timed Out” message. A long
sequence of these messages, terminating only when the maximum timeout
has been reached, may indicate this problem with the target device.
◆ If the target device does not respond or other errors are detected, the switch
will indicate this by one of the following messages:
■
* - No Response
■
H - Host Unreachable
■
N - Network Unreachable
■
P - Protocol Unreachable
■
O -Other
Example
Console#traceroute 192.168.0.1
Press "ESC" to abort.
Traceroute to 192.168.0.99, 30 hops max, timeout is 3 seconds
Hop Packet 1 Packet 2 Packet 3 IP Address
--- -------- -------- -------- ---------------
1 20 ms <10 ms <10 ms 192.168.0.99
Trace completed.
Console#
ping This command sends (IPv4) ICMP echo request packets to another node on the
network.
Syntax
ping host [count count] [size size]
host - IP address or alias of the host.
count - Number of packets to send. (Range: 1-16)
size - Number of bytes in a packet. (Range: 32-512)
The actual packet size will be eight bytes larger than the size specified
because the switch adds header information.
Default Setting
count: 5
size: 32 bytes
Command Mode
Normal Exec, Privileged Exec
Command Usage
◆ Use the ping command to see if another site on the network can be reached.