HP-UX Reference (11i v1 05/09) - 1M System Administration Commands A-M (vol 3)
l
linkloop(1M) linkloop(1M)
NAME
linkloop - verify LAN connectivity with link-level loopback
SYNOPSIS
linkloop [-i PPA][
-n count][-r rif][-s size][-t
timeout][-v] linkaddr ...
DESCRIPTION
The
linkloop command uses IEEE 802.2 link-level test frames to check connectivity within a local area
network (LAN).
linkaddr is the hardware station address of a remote node. Several addresses can be specified at one time.
linkloop 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
lanscan on the
remote node. This hardware station address is usually represented as a hexadecimal string prefixed with
0x. It can also be represented as a octal string prefixed with
0 or as a decimal string. The hardware sta-
tion address must not be a multicast or broadcast address.
Options
linkloop recognizes the following options:
-i PPA Specify the PPA to use. If this option is omitted,
linkloop uses the first PPA
it encounters in an internal data structure.
-n count Set the number of frames to transmit. If count is 0, linkloop
transfers
frames indefinitely until an interrupt signal (defined by the user shell) is
received. The default value for count is
1.
-r rif Specify the particular bridge route over which token ring packets should be
delivered. 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.
-s size 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 max-
imum data byte count that can be used for the particular link.
-t timeout Set the amount of time in seconds to wait for a reply from the remote node
before aborting. If timeout is 0, linkloop waits indefinitely for a reply. The
default value is 2 seconds.
-v 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
linkloop aborts upon receipt of an interrupt signal. If aborted, the current results are printed.
linkloop 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:
address has bad format
An incorrect hardware station address was entered on the command line.
address is not individual
The station address entered on the command line is either a multicast or broadcast address.
frames sent
Total number of frames sent.
frames received correctly
Total number of frames received without errors.
frames with length error
Received frame length does not match transmitted frame length. If the verbose option is set, the
length received is printed.
Section 1M−−422 Hewlett-Packard Company − 1 − HP-UX 11i Version 1: September 2005