Netgear XCM8810 - 8800 SERIES 10-SLOT CHASSIS SWITCH ユーザーズマニュアル

The frames are sent as untagged frames.

The frames are sent with a link-local-assigned multicast address as 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. 
NETGEAR recommends that you advertise information regarding only one or two VLANs on 
the LLDP port, to avoid dropped TLVs. 

If the system drops TLVs because of exceeded length, the system logs a message to the 
EMS and the 

show lldp statistics

 commands shows this information under the 

Tx Length 

Exceeded

 field. 

The LLDPDU has a maximum of 1500 bytes, even with jumbo 

frames enabled. TLVs that exceed this limit are dropped. 

Transmitting LLDP Messages

In transmit mode, the NETGEAR switch periodically sends out an untagged LLDPDU frame 
that contains the mandatory LLDP TLVs as well as the configured optional TLVs. The LLDP 
agent running on the NETGEAR switch passes serially through the list of ports that are 
enabled for LLDP and periodically transmits an LLDP frame containing the mandatory TLVs 
and any configured optional TLVs. The mandatory TLVs and the system description TLV are 
automatically transmitted after you enable LLDP.

The following information, when configured, can be sent at regular intervals:

Chassis ID (mandatory)

Port ID (mandatory)

Time-to-live (mandatory)

Port description 

System name

System description (sent by default) 

System capabilities

Management address

802.1-specific information

VLAN name

Port VLAN ID

Port and protocol VLAN ID

802.3-specific information

MAC/PHY