Transition Networks SM TAT4X Series Web User Manual page 245

Transition Networks
Mode: Indicating if it was a MEP/MIP sending this LTR.
Direction: Indicating if MEP/MIP sending this LTR is ingress/egress.
Forwarded: Indicating if MEP/MIP sending this LTR has forwarded the LTM.
Relay: The Relay action can be one of the following:
MAC: The was a hit on the LT Target MAC
FDB: LTM is forwarded based on hit in the Filtering DB
MFDB: LTM is forwarded based on hit in the MIP CCM DB
Last MAC: The MAC identifying the last sender of the LBM causing this LTR ‐ initiating MEP or previous MIP
forwarding.
Next MAC: The MAC identifying the next sender of the LBM causing this LTR ‐ MIP forwarding or terminating
MEP.
Test Signal: Enable: Test Signal based on transmitting TST PDU can be enabled/disabled.
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).
Peer MEP: The TST frame destination MAC will be taken from the 'Unicast Peer MAC' configuration of this peer.
Rate: The TST frame transmission bit rate ‐ in Kilobits pr. second. Limit in 10 Gbps. This is the bit rate of a
standard frame without any encapsulation. If 1 Mbps rate is selected in a EVC MEP, the added tag will give a
higher bitrate on the wire.
Size: The TST frame size. This is entered as the wanted size (in bytes) of a un‐tagged frame containing TST OAM
PDU ‐ including CRC (four bytes).
Example when 'Size' = 64=> Un‐tagged frame size = DMAC(6) + SMAC(6) + TYPE(2) + TST 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 10240
Bytes.
CPU RX frame MAX size: The MAX frame size (all inclusive) possible to copy to CPU of 10240 Bytes
Consider that the Peer MEP must be able to handle the selected frame size. Consider that in order to
calculate the 'RX rate' a received TST 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.
Pattern: The 'empty' TST PDU has the size of 12 bytes. In order to achieve the configured frame size a
data TLV will be added with a pattern.
Example when 'Size' = 64=> Un‐tagged frame size = DMAC(6) + SMAC(6) + TYPE(2) + TST PDU LENGTH(46) + CRC(4)
= 64 bytes
The TST PDU needs to be 46 bytes so a pattern of 46‐12=34 bytes will be added.
All Zero: Pattern will be '00000000'
All One: Pattern will be '11111111'
10101010: Pattern will be '10101010'
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