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lcp(8)									lcp(8)

Name
       lcp - Local Area Transport server (LAT) control program

Syntax
       /etc/lcp [ options ]

Description
       The  LAT	 control  program, provides the essential functions to control
       and manage LAT terminal service.	 It allows you to start and  stop  LAT
       service,	 modify and display configuration characteristics, and display
       and set error counters to  zero.	  The  following  command  is  usually
       included	 in  the  file	to  automatically  restart  LAT service during
       reboot:
       lcp -s

Options
       The following options can be set with

       -s	      Starts LAT service. Enables connections from LAT	termi‐
		      nal  servers  to	host.  If LAT parameters have not been
		      set, they	 take  on  default  values  specified  in  the
		      option.

       -r	      Resets LAT parameters to the following default values:
		      multicast timer: 30 seconds
		      nodename: hostname
		      node description: ``ULTRIX''
		      servicename: hostname
		      service description: ``ULTRIX LAT SERVICE''

       -g	      Sets  groups  to	grp1,  grp2,  ... , grpn.  A number or
		      string of numbers can be used to set groups.   The  num‐
		      bers  used  for each group must be less than or equal to
		      255.  For example:
		      lcp -g 128

		      or

		      lcp -g 56,5,102,10,20,30,40,50,60,...,
		      110,150,200,210,255
		      A string of groups must be separated by commas  with  no
		      spaces.	If  the string exceeds the width of the screen
		      it must wrap over to the following line.	You cannot use
		      a backslash (\) or a carriage return to break a string.

       -h	      Sets  a  list of ttys (next argument) as being available
		      only for host-initiated connections.  A string  of  ttys
		      must  be	separated  by  commas  with no spaces.	If the
		      string exceeds the width of the  screen,	it  must  wrap
		      over  to the following line.  You cannot use a backslash
		      (\) or a carriage return to break a  string.   Each  tty
		      can  optionally  be associated with a specific port on a
		      specific terminal server by following the	 tty  name  by
		      the  name	 of  the server and port, separated by colons.
		      For example, the following command associates tty15 with
		      the  port	 named	"PORT7"	 on  the terminal server named
		      "LAT_SERVER".
		      /etc/lcp -h /dev/tty15:LAT_SERVER:PORT7

       -H	      Sets a list of ttys (next argument) as  being  available
		      only  for	 terminal  server  initiated  connections.   A
		      string of ttys must be separated by commas with no  spa‐
		      ces.   If	 the string exceeds the width of the screen it
		      must wrap over to the following line.  You cannot use  a
		      backslash (\) or a carriage return to break a string.

       -m	      Sets  multicast transmission timer to the specified time
		      (next argument).	A node advertises its presence to  the
		      LAT  servers by sending out a multicast message over the
		      network. The time variable  sets	the  interval  between
		      transmissions. Valid intervals range from 10 to 255 sec‐
		      onds, with a default of 30 seconds.

       -n	      Sets node to the specified name (next argument).	Speci‐
		      fies  the name that your node will be known by. Although
		      the Terminal Server keeps	 track	of  nodes  without  an
		      associated  nodename, a LAT node must have a nodename in
		      order for a terminal user to establish a	connection.  A
		      node  can have a list of associated services and service
		      ratings, specified by up to 16 alphanumeric  characters.
		      Dollar  ($) and underscore (_) characters are valid, but
		      leading underscores and trailing colons are removed. The
		      nodename	must  be  unique on the Ethernet. The Terminal
		      Server displays the nodename as a service	 if  you  type
		      the  command, and as a node if you type the command. The
		      nodename default is the hostname.

       -N	      Sets node description to	the  specified	message	 (next
		      argument).  The node description allows for a short mes‐
		      sage to be displayed to LAT  users,  providing  news  or
		      additional  node information.  Specify up to 64 alphanu‐
		      meric characters.	 Dollar ($) and underscore (_) charac‐
		      ters  are	 valid,	 but  leading underscores and trailing
		      colons are removed.   Leading  ampersands	 (&)  are  not
		      allowed.	The  default  is ``ULTRIX''.  You must enclose
		      the string in double quotation marks (" ")  if  it  con‐
		      tains one or more spaces.

       -v	      A	 service  node	advertises  one	 or more services.  By
		      default the single service offered  is  the  node	 name.
		      For  example,  node by default offers service The option
		      lets you change this default.  It also  lets  you	 cause
		      the  service node to advertise more than one service and
		      associate a given set of LAT ttys with each  service  by
		      appending	 a list of minor device numbers to the service
		      name. For example, the following command causes the node
		      to offer two additional services, "SERV1" and "SERV2":
		      /etc/lcp -v microv -v SERV1:/dev/tty15,/dev/tty16\
		      -v SERV2:/dev/tty17,/dev/tty18,/dev/tty19
		      Devices  tty15  and  tty16  are used for SERV1.  Devices
		      tty17, tty18, and tty19 are used for SERV2.   All	 other
		      LAT ttys are used for the default service,

       Note that normal LAT service is always associated with the first option
       to appear.  Therefore, if you wish to advertise additional services you
       must define the service name for normal lat, even if you still want the
       default service name, as in the above example.

       Every time you issue a new lcp command with the option, the new set  of
       services	 that  you  define  completely replaces any previously defined
       services.  To discontinue a previously  defined	service,  reissue  lcp
       with  the option without specifying that service.  For example, to dis‐
       continue the SERV1 service, use the following command:
       /etc/lcp -v microv \
       -v SERV2:dev/tty17,dev/tty18,dev/tty19

-V	       Sets service description to specified message (next  argument).
	       It  can be up to 64 characters in length.  You must enclose the
	       string in double quotation marks (" ") if it  contains  one  or
	       more  spaces.   If  you	are defining multiple services a given
	       description applies to the service name defined by  the	corre‐
	       sponding	 option	 (the  first  option  corresponds to the first
	       option, and so on). For example, the  following	command	 asso‐
	       ciates  the  description	 "ULTRIX LAT service" with the service
	       name and description "service 1" with service name "SERV1".
	       /etc/lcp -v microv -v SERV1:dev/tty15,dev/tty16\
	       -V "ULTRIX LAT service" -V "service 1"

-t	       Stops  LAT  service.  Disable  connections  from	 LAT  terminal
	       servers to host.

-d	       Displays LAT characteristics. Shows the LAT parameters at their
	       current setting. The following is an example of the  output  of
	       the option:
	       % /etc/lcp -d

	       Node name: NODE	   Service name: NODE
	       Node Identification: ULTRIX LAT service
	       Service Identification: ULTRIX
	       Groups: 0
	       Multicast timer: 30 seconds
	       LAT version: 5 eco: 0  LAT Protocol is active

-z	       Reinitializes (zeroes out) error counters.  To test system per‐
	       formance over a period of time, zero the counters  and  observe
	       the information that accumulates.

-c	       Displays	 error	counters  in  vertical format.	If an interval
	       also is specified (next argument), displays error  counters  in
	       horizontal  format every interval seconds.  The following is an
	       example of the output of the option:
	       % /etc/lcp -c
	       67413 Frames received (rcv)
		  32 Duplicate frames received (rcvdup)
	       89005 Frames transmitted (xmit)
		  62 Retransmissions (rexmit)
		   0 Illegal messages received (illmesg)
		   0 Illegal slots received (illslots)

interval       Continuously displays  error  counters  in  horizontal  format,
	       waiting	interval seconds between each iteration. Quit by send‐
	       ing a keyboard interrupt.  The following is an example  of  the
	       output of the interval option:
	       % /etc/lcp 10
	       rcv     rcvdup  xmit    rexmit  illmesg	illslots
	       67474   32      89066   62      0	0
	       67483   32      89067   62      0	0
	       67491   32      89073   62      0	0
	       67502   32      89089   62      0	0

-p	       Shows  which  LAT  server/port  combination  a specific LAT tty
	       device is connected to.	For example the following command dis‐
	       plays which terminal server and port are associated with tty15.
	       /etc/lcp -p /dev/tty15

Restrictions
       The service and node names cannot be more than 16 characters long.

       The user must have read and write access to a terminal.

Error Counters
       The meaning of each error counter is explained below.

       rcv	      Number of Ethernet LAT messages

       rcvdup	      Number  of  duplicate  messages received (normally indi‐
		      cates a system slowdown)

       xmit	      Number of transmitted Ethernet LAT messages

       rexmit	      Number of transmit frames that are sent more than once

       illmesg	      Number of bad messages flagged by the LAT driver

       illslots	      Number of bad transmission slots flagged by the driver

Diagnostics
       Messages indicating that user is not privileged or that LAT service  is
       not loaded

Files
       See Also
	      lta(4), ttys(5)

									lcp(8)
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