lldpad

lldpad(8)                   System Manager's Manual                  lldpad(8)



NAME
       lldpad - Link Layer Discovery Protocol (LLDP) agent daemon

SYNOPSIS
       lldpad [-h] [-v] [-V level] [-d] [-k] [-p] [-s] [-t] [-f filename]

DESCRIPTION
       Executes the LLDP protocol for supported network interfaces.  The list
       of TLVs currently supported are:

       -      IEEE 802.1AB Mandatory TLVs

       -      IEEE 802.1AB Basic Management TLVs

       -      IEEE 802.3 Organizationally Specific TLVs

       -      LLDP-MED Organizationally Specific TLVs

       -      Data Center Bridging capabilities exchange protocol (DCBX) TLVs

       -      Edge Virtual Bridging (EVB) TLVs

       Capabilities of lldpad include:

       -      Transmission of LLDP PDUs containing enabled TLVs from enabled
              ports.

       -      Reception of LLDP PDUs from enabled ports.

       -      Operation of the DCBX protocol for interfaces which support the
              DCB rtnetlink interface.  This includes operation of the DCBX
              state machines above LLDP and corresponding configuration of the
              DCB parameters of the network interface.  Supported DCB features
              are: Extended Transmission Selection, Priority Flow Control and
              the FCoE application.

       -      Configuring the DCB settings of the network driver based on the
              operation of DCBX.

       -      Provides a multi-channel interface for client applications to
              query and configure features.  Events are also generated on the
              client interface to inform clients of changes.  The lldpad
              package includes two clients:  lldptool for general LLDP agent
              management and dcbtool for DCB management.

       lldpad supports the versions of the DCB capabilities exchange (DCBX)
       protocol listed as follows:

       version 1 - also known as CIN DCBX
              <http://download.intel.com/technology/eedc/dcb_cep_spec.pdf>

       version 2 - also known as CEE DCBX
              <http://www.ieee802.org/1/files/public/docs2008/az-wadekar-dcbx-
              capability-exchange-discovery-protocol-1108-v1.01.pdf>

       IEEE DCBX
              See the IEEE 802.1Qaz-2011 specification for details.

       IEEE DCBX is the default DCBX mode for a DCB capable interface so the
       default and configured IEEE DCBX TLVs will be transmitted when the
       interface comes up.  lldpad can be globally configured to support one
       of the legacy DCBX versions (CIN or CEE).  If the remote LLDP agent
       does not transmit any IEEE DCBX TLVs and does transmit a legacy DCBX
       TLV which matches the configured legacy DCBX version, then the DCBX
       mode will drop back to legacy DCBX mode.  It will not transition back
       to IEEE DCBX mode until the next link reset.  If lldpad has dropped
       back to legacy DCBX mode for a given interface and the daemon is
       stopped and restarted, the legacy DCBX mode for that interface will be
       used instead of starting out in IEEE DCBX mode.  This behavior only
       applies to the case where lldpad is restarted and is not persistent
       across a system reboot.

       See dcbtool for information on how to globally configure which legacy
       version of DCBX lldpad executes.

       See lldptool for information on how to reset the DCBX mode of an
       interface back to default (starts out in IEEE DCBX mode).

       lldpad also supports edge virtual bridging as currently under
       specification in the IEEE 802.1Qb working group.
       <http://www.ieee802.org/1/pages/802.1bg.html>


OPTIONS
       lldpad has the following command line options:

       -h     show usage information

       -f filename
              use the specified file as the configuration file instead of the
              default file: /var/lib/lldpad/lldpad.conf lldpad expects the
              directory of the configuration file to exist, but if the
              configuration file does not exist, then a default configuration
              file will be created.  lldpad creates and maintains the contents
              of the configuration file.  Configuration should be performed by
              using lldptool or dcbtool.

       -d     run lldpad as a daemon

       -v     show lldpad version

       -V level
              set lldpad debugging level. Uses syslog debug levels see
              syslog.2 for details.

       -k     used to terminate the first instance of lldpad that was started
              (e.g. from initrd).  Once lldpad -k has been invoked and lldpad
              has been restarted, subsequent invocations of lldpad -k will not
              terminate lldpad.


       -s     remove lldpad state records from shared memory

       -p     do not create PID file /var/run/lldpad.pid on startup

       -t     omit timestamps from logging messages

NOTE
       On termination, lldpad does not undo any of the configurations that it
       has set. This approach minimizes the risk of restarting the daemon to
       perform a software update, or of having storage issues during shutdown.
       Ongoing operation of network interfaces that had been controlled by
       lldpad may result in unexpected behavior.


SEE ALSO
       dcbtool(8), lldptool(8), lldptool-dcbx(8), lldptool-ets(8), lldptool-
       pfc(8), lldptool-app(8), lldptool-med(8), lldptool-vdp(8), lldptool-
       evb(8)


COPYRIGHT
       lldpad - LLDP agent daemon with DCBX support
       Copyright(c) 2007-2012 Intel Corporation.   Portions of lldpad  are
       based on:

       hostapd-0.5.7

       Copyright
              (c) 2004-2008, Jouni Malinen <j@w1.fi>

LICENSE
       This program is free software; you can redistribute it and/or modify it
       under the terms and conditions of the GNU General Public License,
       version 2, as published by the Free Software Foundation.

       This program is distributed in the hope it will be useful, but WITHOUT
       ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
       FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
       for more details.

       You should have received a copy of the GNU General Public License along
       with this program; if not, write to the Free Software Foundation, Inc.,
       51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

       The full GNU General Public License is included in this distribution in
       the file called "COPYING".

SUPPORT
       Contact Information: open-lldp Mailing List <lldp-devel@open-lldp.org>



                                March 23, 2012                       lldpad(8)