The value of tmnxDot1agCfmMepSlmTWDataSize specifies the data size,
in bytes, contained in the padding TLV for the two-way Synthetic Loss
Measurement (SLM) test. A value of zero (0) specifies that no padding
TLV is inserted in the SLM packet. Any non-zero value will increase
the packet size by the specified data size plus 3 bytes for the TLV
header.