Ubuntu Manpage: evb22 - Show / manipulate EVB IEEE 802.1 Ratified Standard TLV configuration

NAME

       evb22 - Show / manipulate EVB IEEE 802.1 Ratified Standard TLV configuration

SYNOPSIS

       lldptool -t -i ethx -g ncb -V evb

       lldptool -t -i ethx -g ncb -V evb -c evbmode

       lldptool -T -i ethx -g ncb -V evb -c enabletx=[yes|no]

       lldptool -T -i ethx -g ncb -V evb -c evbmode=[bridge|station]

       lldptool -t -i ethx -g ncb -V evb -c evbrrreq

       lldptool -T -i ethx -g ncb -V evb -c evbrrreq=[yes|no]

       lldptool -t -i ethx -g ncb -V evb -c evbrrcap

       lldptool -T -i ethx -g ncb -V evb -c evbrrcap=[yes|no]

       lldptool -t -i ethx -g ncb -V evb -c evbgpid

       lldptool -T -i ethx -g ncb -V evb -c evbgpid=[yes|no]

       lldptool -t -i ethx -g ncb -V evb -c ecpretries

       lldptool -T -i ethx -g ncb -V evb -c ecpretries=[0..7]

       lldptool -t -i ethx -g ncb -V evb -c ecprte

       lldptool -T -i ethx -g ncb -V evb -c ecprte=[0..31]

       lldptool -t -i ethx -g ncb -V evb -c vdprwd

       lldptool -T -i ethx -g ncb -V evb -c vdprwd=[0..31]

       lldptool -t -i ethx -g ncb -V evb -c vdprka

       lldptool -T -i ethx -g ncb -V evb -c vdprka=[0..31]

DESCRIPTION

The Edge Virtual Bridge (EVB) TLV is a TLV to announce the station and bridge's edge virtual bridging
(EVB) capabilities and may request the bridge port to be set into reflective relay (hairpin) mode. If
both sides agree on the modes and time out values, the edge control protocol (ECP) will be used to
exchange VSI discovery protocol (VDP) data using ECP frames between the host interface and the adjacent
switch port facing the host interface.

This man pages describes the IEEE 802.1 Qbg ratified standard dated from July 5th, 2012. The arguments
and parameters differ from the IEEE 802.1 Qbg draft 0.2, which is also implemented. The EVB protocol
version to be used depends on the organizational unique identifier (OUI) of the EVB TLV in the LLDP data
stream. A OUI value of 0x001b3f stands for the IEEE 802.1 Qbg draft 0.2, a OUI value of 0x0080c2 stands
for the IEEE 802.1 Qbg ratified standard. The version of the ECP and VDP protocols are determined by the
ethernet type field in the ethernet header. The ethernet type value for IEEE 802.1 Qbg draft 0.2 is
0x88b7, the value for IEEE 802.1 Qbg ratified standard is 0x8890. Note that the EVB protocol is
exchanged between nearest customer bridges only, employing the reserved multicast MAC address
01:80:c2:00:00:00 as destination MAC address. lldpad(8) supports both versions, the switch port
configuration determines which version will be used. The switch port configuration should select only
one protocol version, never both.

The command line options and arugments are explained in the lldptool(8) man pages. Only the EVB, ECP and
VDP protocol specific parameters are detailed in this manual page.

ARGUMENTS

The invocation without command line option '-c' and argument displays the complete EVB, ECP and VDP
protocol settings. See below for a detailed description on how to interpret the output.

-c text
Use command line option '-c' and one of the following arguments to display and set individual
parameters. Text can be one of the following values:

enabletx
Enables or disables the EVB TLV to be transmitted. When set to disabled no EVB TLV will be
included in the LLDP data stream. Furthermore the output of the complete EVB settings without
option '-c' will be empty.

evbmode
Display the current role or sets the role the to given value. Supported values are either
"station" or "bridge".

evbrrreq
Shows the current reflective relay (hairpin) request mode or sets the reflective relay (hairpin)
request mode. If the value is "yes", the station requests the interface facing switch port to be
set in reflective relay (hairpin) mode. This field is only valid for stations, the output of
evbmode equals "station".

evbrrcap
Shows the current reflective relay (hairpin) capabilities or sets the reflective relay (hairpin)
capabilities. If the value is "yes", the switch port will be set in reflective relay (hairpin)
mode. This field is only valid for switches, the output of evbmode equals "bridge".

gpid Shows the current station or switch support for grouping or turns on/off the station or switch
support for grouping. If set to true, the station or switch wants to use group identifiers in VDP
protocols.

ecpretries
Shows or sets the maximum number of retries for ECP frames to be retransmitted. A retransmit
occurs when no ECP acknowledgement message has been received during a given time period.

ecprte Shows or sets the local run time exponent (RTE). The RTE will be used as the base for the timing
of the ECP protocol time outs and retransmits. The wait time is calcuated as 10*2ecprte micro
seconds.

vdprwd Shows or sets the number of resource wait delay value. This value is calcuated as 10*2vdprwd
micro seconds and determines the maximum wait time for VDP protocol acknowledgements.

vdprka Shows or sets the number of re-init keep alive value. This value is calcuated as 10*2vdprka micro
seconds and determines the wait time for VDP protocol to send a keep alive message.

Theory of Operation

       The  EVB  TLV  is  used to announce and exchange supported parameters between the station and an adjacent
       switch.  If reflectiverelay is active, the switch sends back ethernet frames on the  very  same  port  it
       received  the  frame  on.  This is an extension to the current bridging standard and allows communication
       between virtual machines on the same host through the switch port.

EXAMPLE & USAGE

Display locally configured values for eth0
lldptool -t -g ncb -i eth0 -V evb
EVB Configuration TLV
bridge:(00)
station:rrreq,rrstat(0x5)
retries:7 rte:31
mode:station r/l:0 rwd:31
r/l:0 rka:8
This output is displayed when enabletx has been enabled. The first line shows the currently known
status of the bridge. The second line shows the currently known status of the station. The
status is displayed verbose appended by the hexadecimal value in parenthesis. The verbose output
uses the bit naming convention used in the standard document. The third line displays the values
for the ECP protocol number of retransmits (retries) and the retransmit timeout exponent. The
forth line shows the current mode of operation, either bridge or station, the resource wait delay
value (rwd) and an indication if the local (0) or remote (1) rwd value is used. The fifth line
displays the value of the re-init keep alive counter (rka) and an indication if the local (0) or
remote (1) rka value is used.

Display the currently requested forwarding mode for eth0
lldptool -t -g ncb -i eth0 -V evb -c evbrrreq

Display the locally configured value for RTE
lldptool -t -g ncb -i eth0 -V evb -c evbrte

Set the value for RTE to its maximum value
lldptool -T -g ncb -i eth0 -V evb -c rte=7

Set the value for enabletx to yes to transmit EVB TLV
to the switch. lldptool -T -g ncb -i eth0 -V evb -c enabletx=yes

NOTES

       Currently  the  code  in  lldpad  reflects  IEEE 802.1 Qbg draft 0.2 of the upcoming standard.  Wireshark
       support for IEEE 802.1 Qbg ratified standard TLVs is currently missing.  Support for the IEEE  802.1  Qbg
       ratified standard protocols ECP and VDP is currently under development and not fully functional.

AUTHOR

       Thomas Richter

open-lldp                                         February 2013                                      lldptool(8)