Application Guide

[156]
Software User's
Manual
–
Version 3.0
Fault Management
This page allows the user to inspect and configure the Fault Management of the
current MEP Instance.
Loop Back
Setting Description
Enable
Loop Back based on transmitting/receiving LBM/LBR PDU can be
enabled/disabled. Loop Back is automatically disabled when all 'To Send' LBM
PDU has been transmitted
-
waiting 5 sec. for all LBR from the end.
DEI The DEI to be inserted as PCP bits in TAG (if any).
Priority The priority to be inserted as PCP bits in TAG (if any).
Cast
Selection of LBM PDU transmitted unicast or multi-cast. The unicast MAC will be
configured through 'Peer MEP' or 'Unicast Peer MAC'. Towards MIP only unicast
Loop Back is possible.
Peer MEP
This is only used if the 'Unicast MAC' is configured to all zero. The LBM unicast
MAC will be taken from the 'Unicast Peer MAC' configuration of this peer.
Unicast MAC
This is only used if NOT configured to all zero. This will be used as the LBM PDU
unicast MAC. This is the only way to configure Loop Back towards a MIP.
To Send
The number of LBM PDU to send in one loop test. The value 0 indicates infinite
transmission (test
behavior
). This is HW based LBM/LBR and
r
equires VOE.
Size
The LBM frame size. This is entered as the wanted size (in bytes) of an un-
tagged frame containing LBM OAM PDU - including CRC (four bytes).
Example when 'Size' = 64=> Untagged frame size = DMAC(6) + SMAC(6) +
TYPE(2) + LBM PDU LENGTH(46) + CRC(4) = 64 bytes
The transmitted frame will be four bytes longer for each tag added - 8 bytes in
case of a tunnel EVC.
There are two frame MAX sizes to consider:
 Switch RX frame MAX size: The MAX frame size (all inclusive) accepted
on the switch port of 9600 Bytes.
 CPU RX frame MAX size: The MAX frame size (all inclusive) possible to
copy to CPU of 1526 Bytes.
Consider that the Peer MEP must be able to handle the selected frame size.
Consider that in case of SW based MEP, the received LBR PDU must be copied
to CPU.
Warning will be given if selected frame size exceeds the CPU RX frame MAX
size Frame.
MIN Size is 64
Bytes.