NAME

       udplso - UDP-based LTP link service output task

SYNOPSIS

       udplso {remote_engine_hostname | @}[:remote_port_nbr] [txbps] remote_engine_nbr

DESCRIPTION

       udplso is a background "daemon" task that extracts LTP segments from the queue of segments
       bound for the indicated remote LTP engine, encapsulates them in UDP datagrams, and sends
       those datagrams to the indicated UDP port on the indicated host.  If not specified, port
       number defaults to 1113.

       UDP congestion can be controlled by setting udplso's rate of UDP datagram transmission
       txbps (transmission rate in bits per second) to the value that is supported by the
       underlying network.

       Each "span" of LTP data interchange between the local LTP engine and a neighboring LTP
       engine requires its own link service output task, such as udplso.  All link service output
       tasks are spawned automatically by ltpadmin in response to the 's' command that starts
       operation of the LTP protocol, and they are all terminated by ltpadmin in response to an
       'x' (STOP) command.

EXIT STATUS

       "0" udplso terminated normally, for reasons noted in the ion.log file.  If this
           termination was not commanded, investigate and solve the problem identified in the log
           file and use ltpadmin to restart udplso.

       "1" udplso terminated abnormally, for reasons noted in the ion.log file.  Investigate and
           solve the problem identified in the log file, then use ltpadmin to restart udplso.

FILES

       No configuration files are needed.

ENVIRONMENT

       No environment variables apply.

DIAGNOSTICS

       The following diagnostics may be issued to the ion.log log file:

       udplso can't initialize LTP.
           ltpadmin has not yet initialized LTP protocol operations.

       No such engine in database.
           remote_engine_nbr is invalid, or the applicable span has not yet been added to the LTP
           database by ltpadmin.

       LSO task is already started for this engine.
           Redundant initiation of udplso.

       LSO can't open UDP socket
           Operating system error.  Check errtext, correct problem, and restart udplso.

       LSO can't connect UDP socket
           Operating system error.  Check errtext, correct problem, and restart udplso.

       Segment is too big for UDP LSO.
           Configuration error: segments that are too large for UDP transmission (i.e., larger
           than 65535 bytes) are being enqueued for udplso.  Use ltpadmin to change maximum
           segment size for this span.

BUGS

       Report bugs to <ion-bugs@korgano.eecs.ohiou.edu>

SEE ALSO

       ltpadmin(1), ltpmeter(1), udplsi(1), owltsim(1)