TLV stands for Type Length Value and the other half of the message is saying that it had an unrecognized object identifier. This is a generic error.
If you're curious as to the different types of messages a list of them is in the DOCSIS 3.0 specification CM-SP-MULPIv3.0-I17-111117 MAC and Upper Layer Protocols Interface Specification on page 478.
»www.cablelabs.com/cablemodem/spe ··· s30.html
Chris@Cox Communications Arizona