Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (OSF1-V5.1-alpha)
Apropos / Subsearch:
optional field

learp(8)							     learp(8)


  learp	- Displays the contents	of a LAN-Emulation Address Resolution Proto-
  col (LE-ARP) table


  /usr/sbin/learp [-u unit_number] -a


  -u unit_number
      Specifies	a LE-ARP cache.	The unit number	is the same as is displayed
      by the netstat -i	command.  For example: elan0 is	unit 0,	elan1 is unit
      1, and so	on.

      If the -u	option is not specified, the default unit number is 0.

  -a  Displays all entries in the LAN-Emulation	Address	Resolution Protocol
      (LE-ARP) table.


  Each LAN-Emulation Client interface (displayed as elann in netstat output)
  has an Address Resolution Protocol (LE-ARP) table that contains mappings of
  6-byte medium	access control (MAC) addresses to 20-byte Asynchronous
  Transfer Mode	(ATM) addresses.  The learp command displays the contents of
  the LE-ARP table.

  Each LE-ARP table entry contains the following information:

  MAC Address
      Each MAC address that has	been or	is being contacted through the ATM-
      emulated LAN.

      One of the following state values:

	+  AP -- LE-ARP	is pending.  The ATM address associated	with the MAC
	   address is not known.

	+  DE -- Delete	of the LE-ARP cache entry is pending. When there are
	   no more VCs for a LE-ARP entry, it is marked	for deletion.  After
	   there is no activity	for 5 minutes (age periond), the entry is
	   removed for the cache.

	+  FD -- Forward Direct.  Packets flowing to the destination are
	   using the data-direct VC.

	+  FL -- Flush is pending.  A new VC has been established with the
	   remote node and the broadcast channel is being flushed so packets
	   flowing on the new VC will not arrive out of	order.

	+  VP -- Virtual Channel (VC) setup is pending.	 The ATM address is
	   known, but no VC is established with	the remote node.

  ATM Address
      If known,	the 20-byte ATM	address	associated with	the MAC	address.

      One of the following flags:

	+  R --	Remote entry.  The MAC address is on a legacy (that is,	Eth-
	   ernet) network on the back side of an ATM edge device.

	+  P --	Permanent entry.  The LE-ARP entry is permanent.

  VPI and VCI
      If known,	this is	the Virtual Path Identifier (VPI) and the Virtual
      Channel Identifier (VCI) of the data-direct VC used by packets destined
      to the MAC address.  Many	MAC addresses may use the same VC.


  The following	example	shows the output of a learp -a command in which	the
  LE-ARP cache contains	five entries:

       # learp -a
       le-arp cache contains 5 entries.
	  MAC Address	 State		  ATM Address		       Flags VPI/VCI
       08-00-2b-01-01-01 (AP) pending
       08-00-2b-01-01-02 (VP) 39000000000000000000000000.08002b010102.00     pending
       08-00-2b-01-02-02 (FL) 39000000000000000000000000.08002b010203.00  R    0/65
       08-00-2b-01-02-03 (FD) 39000000000000000000000000.08002b010203.00       0/65


  Commands: atmconfig(8), atmelan(8), atmsig(8)