linkloop(1M)linkloop(1M)NAMElinkloop - verify LAN connectivity with link-level loopback
PPA] count] rif] size] timeout] linkaddr ...
The and commands are deprecated. See for more information.
The command uses IEEE 802.2 link-level test frames to check connectiv‐
ity within a local area network (LAN).
linkaddr is the hardware station address of a remote node. Several
addresses can be specified at one time.
tests the connectivity of the local node and the remote node specified
by each hardware station address. The hardware station address of a
remote node can be found by executing on the remote node. This hard‐
ware station address is usually represented as a hexadecimal string
prefixed with It can also be represented as a octal string prefixed
with or as a decimal string. The hardware station address must not be
a multicast or broadcast address.
recognizes the following options:
Specify the PPA to use. If this option is omitted, uses the
first PPA it encounters in an internal data
Set the number of frames to transmit.
If count is transfers frames indefinitely until
an interrupt signal (defined by the user shell)
is received. The default value for count is
Specify the particular bridge route
over which token ring packets should be deliv‐
ered. rif is the routing information field used
for token-ring networks. Its value is given as
an even number of hexadecimal bytes separated by
colons, up to a maximum of 16 bytes.
Set the size in bytes of the data message to send.
The maximum data size is dependent on the type of
LAN link being used. The default value is the
maximum data byte count that can be used for the
Set the amount of time in seconds to wait for a reply
from the remote node before aborting. If timeout
is waits indefinitely for a reply. The default
value is 2 seconds.
Set the verbose option.
In addition to the regular summary of test
results, this option displays more extensive
error information. If there are header or length
errors, appropriate messages are displayed. All
verbose output is preceded by the number of
replies accepted before an error occurred.
Connectivity Test Results
aborts upon receipt of an interrupt signal. If aborted, the current
results are printed.
prints the result of the link-level connectivity test. If the test
fails, it prints a summary of the test and indicates the type of error.
The possible messages are:
An incorrect hardware station address was entered on the command
The station address entered on the command line is either a mul‐
ticast or broadcast address.
Total number of frames sent.
Total number of frames received without errors.
Received frame length does not match transmitted frame length.
If the verbose option is set, the length received is printed.
Received frame does not match transmitted frame.
Number of frames received containing unexpected frame header
information. Either the source address does not match the
remote address, the destination address does not match the local
address, or the control field is not the TEST frame control
field. These frames are ignored. continues to try to receive
the reply frame until the operation times out.
Count of how many operations timed out before the reply was
The count specified in the option is a negative integer, or the
number specified is too large for the local computer.
The timeout specified in the option is a negative integer, or
the value specified multiplied by 1000 is too large for the
The size specified in the option is not in the range from 0 to
the maximum link data size. Remember that the maximum link data
size can vary in value for different LAN connection types. The
current MTU can be obtained with the command.
The PPA specified in the option is not a valid PPA.
Device file does not exist.
The rif value in the option is invalid.
The number of bytes in rif in the option exceeded 16, which is
the maximum allowed.
The number of bytes in rif in the option is odd. The number of
bytes must be even.
The and commands are deprecated. These commands will be removed in a
future HP-UX release. HP recommends the use of replacement command
nwmgr(1M) to perform all network interface-related tasks.
was developed by HP.
SEE ALSOlanadmin(1M), lanscan(1M), nwmgr(1M), lan(7).
TO BE OBSOLETED linkloop(1M)