learp - Displays the contents of a LAN-Emulation Address Resolution Proto-
col (LE-ARP) table
/usr/sbin/learp [-u unit_number] -a
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
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:
Each MAC address that has been or is being contacted through the ATM-
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.
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)