lldptool(8)							       Linux							       lldptool(8)

NAME

       evb - Show / manipulate EVB TLV configuration

SYNOPSIS

       lldptool -t -g ncb -i ethx -V evbCfg -c enableTx

       lldptool -T -g ncb -i ethx -V evbCfg -c enableTx=[yes|no]

       lldptool -t -g ncb -i ethx -V evbCfg -c fmode

       lldptool -T -g ncb -i ethx -V evbCfg -c fmode=[bridge|reflectiverelay]

       lldptool -t -g ncb -i ethx -V evbCfg -c capabilities

       lldptool -T -g ncb -i ethx -V evbCfg -c capabilities=[rte|ecp|vdp|none]

       lldptool -t -g ncb -i ethx -V evbCfg -c rte

       lldptool -T -g ncb -i ethx -V evbCfg -c rte=[<rte>]

       lldptool -t -g ncb -i ethx -V evbCfg -c vsis

       lldptool -T -g ncb -i ethx -V evbCfg -c vsis=[<number of vsis>]

DESCRIPTION

       The  EVB TLV is a TLV to announce the station and bridge's edge virtual bridging (evb) capabilities and request the bridge forwarding mode.
       If both sides have agree on edge control protocol (ECP), VSI discovery protocol (VDP) capabilities, both sides can exchange VDP	TLV  using
       ECP frames.  The vsis parameter will set the maximum number of VSIs and show the number of currently configured VSIs.

ARGUMENTS

       enableTx
	      Enables the EVB TLV to be transmitted

       fmode  shows or sets the forwarding mode between bridge (default) or reflectiverelay (RR).

       capabilities
	      shows  or  sets the local capabilities that are announced to the adjacent switch in the TLV. This parameter will accept any combina-
	      tion of rte, vdp or ecp, separated by ",". Use the keyword "none" if you do not want to set any capabilities.

       rte    shows or set the local run time exponent (RTE). The RTE will be used as the base for the timing of the ECP and VDP protocols.

       vsis   shows or sets the number of virtual station interfaces (VSIs) that are announced to the adjacent switch in the TLV.  This  parameter
	      expects a number between 0 and 65535.

Theory of Operation
       The EVB TLV is used to announce and exchange supported parameters between the station and an adjacent switch. The TLV uses the nearest cus-
       tomer bridge agent.

       If "reflectiverelay" is set as forwarding mode, the switch will allow "reflection" of frames coming from different sources at the same port
       back to the port. This will allow communication between virtual machines on the same host via the switch.

       The capabilities parameter is used to set RTE, ECP and VDP support. VDP TLVs in ECP frames can only be exchanged if both sides agree on ECP
       and VDP as capabilities. RTE will be used as the base timing parameter for ECP and VDP.

EXAMPLE &; USAGE
       Display locally configured values for eth8
	      lldptool -t -g ncb -i eth8 -V evbCfg

       Display remotely configured values for eth8
	      lldptool -n -g ncb -t -i eth8 -V evbCfg

       Display wether evb tlv is configured for tx on eth8
	      lldptool -t -g ncb -i eth8 -V evbCfg -c enableTx

       Display the currently requested forwarding mode for eth8
	      lldptool -t -g ncb -i eth8 -V evbCfg -c fmode

       Set the forwarding mode to reflective relay
	      lldptool -T -g ncb -i eth8 -V evbCfg -c fmode=reflectiverelay

       Display the currently configured capabilities
	      lldptool -t -g ncb -i ethx -V evbCfg -c capabilities

       Set the locally possible capabilities to RTE, ECP and VDP
	      lldptool -T -g ncb -i ethx -V evbCfg -c capabilities=rte,ecp,vdp

       Resets the locally possible capabilities to "none"
	      lldptool -T -g ncb -i ethx -V evbCfg -c capabilities=none

       Display the locally configured value for RTE
	      lldptool -t -g ncb -i ethx -V evbCfg -c rte

       Set the value for RTE
	      lldptool -T -g ncb -i ethx -V evbCfg -c rte=[<rte>]

       Display the configured maximum number of VSIs
	      lldptool -t -g ncb -i ethx -V evbCfg -c vsis

       Set the maximum number of VSIs
	      lldptool -T -g ncb -i ethx -V evbCfg -c vsis=[<number of vsis>]

SOURCE

       o      IEEE 802.1Qbg (http://www.ieee802.org/1/pages/802.1bg.html)

NOTES

       Currently the code in lldpad reflects draft 0 of the upcoming standard. EVB TLVs on the wire can be decoded with wireshark > v1.6.

SEE ALSO

       lldptool-vdp(8), lldptool(8), lldpad(8)

AUTHOR

       Jens Osterkamp

open-lldp							   February 2010						       lldptool(8)