As per the 802.1ag standard, optional TLV’s are carried as part of IEEE 802.1ag packet. Basically LTM/LTR packets are meant to trace the path from source end point to destination end point. The idea is to enhance LTM/LTR packet to carry additional TLVs for a specified priority and VLAN, and to check for loss-less and/or security or not.
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ALE USA Inc., "Trace The Security And/Or Lossless Component In Data Center Lossless Ethernet Network Using CFM (IEEE802.1ag)", Technical Disclosure Commons, (November 24, 2016)