INS_CNGE3FE8MS[POE][HO] Rev. 11.7.17 PAGE 121
INSTRUCTION MANUAL CNGE3FE8MS[POE][HO]
TECH SUPPORT: 1.888.678.9427
Object Description
Loop Back
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'. To-wards 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 to-wards a MIP.
MPLS TTL The Time-To-Live value to be used for the MPLS OAM LBM PDU. It is insignificant when this MEP
domain type is MPLS Link/Tunnel/PW/LSP. The allowed value is from 0 through 255.
To Send The number of LBM PDU to send in one loop test. The value 0 indicate infinite transmission (test
behaviour). This is HW based LBM/LBR and Requires VOE.
Size The LBM frame size. This is entered as the wanted size (in bytes) of a un-tagged frame containing LBM
OAM PDU - including CRC (four bytes).
Example when 'Size' = 64=> Un-tagged 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 96009600
Bytes
CPU RX frame MAX size: The MAX frame size (all inclusive) possible to copy to CPU of 15261526 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.
Interval The interval between transmitting LBM PDU. In 10ms. in case 'To Send' != 0 (max 100 - '0' is as fast
as possible) In 1us. in case 'To Send' == 0 (max 10.000)",
Loop Back State
Transaction ID The transaction id of the first LBM transmitted. For each LBM transmitted the transaction id in the
PDU is incremented.
Transmitted The total number of LBM PDU transmitted.
Reply MAC The MAC of the replying MEP/MIP. In case of multi-cast LBM, replies can be received from all peer
MEP in the group. This MAC is not shown in case of 'To Send' == 0.
Received The total number of LBR PDU received from this 'Reply MAC'.
Out Of Order The number of LBR PDU received from this 'Reply MAC' with incorrect 'Transaction ID'.
Link Trace
Enable Link Trace based on transmitting/receiving LTM/LTR PDU can be enabled/disabled. Link Trace is
automatically disabled when all 5 transactions are done with 5 sec. interval - waiting 5 sec. for all
LTR in the end. The LTM PDU is always transmitted as Multi-cast Class 2.
Priority The priority to be inserted as PCP bits in TAG (if any).
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