LLDP packets transport TLVs to other network devices (the following figure).
They are IEEE 802.3 Ethernet frames.
The frames are sent as untagged frames.
The frames are sent with a link-local-assigned multicast address as the destination address.
The Spanning Tree Protocol (STP) state of the port does not affect the transmission of LLDP frames.
The length of the packet cannot exceed 1500 bytes. As you add TLVs, you increase the length of the LLDP frame. When you reach 1500 bytes, the remaining TLVs are dropped. We recommend that you advertise information regarding only one or two VLANs on the LLDP port, to avoid dropped TLVs.
Note
The LLDPDU maximum size is 1500 bytes, even with jumbo frames enabled. TLVs that exceed this limit are dropped.