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