Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH ユーザーズマニュアル

MED TLVs. Likewise, when disabling the LLDP MED TLVs, you must disable the LLDP-MED 
capabilities TLVs only after you have disabled all other LLDP MED TLVs. 

The LLDP MED protocol extension introduces a new feature called MED fast start, which is 
automatically enabled when the LLDP MED capabilities TLV is enabled. When a new 
MED-capable device is detected, the detecting switch sends out an LLDPDU each 1 second 
for the configured number of times (called the repeat count). By default, the switch sends out 
the LLDPDU each 1 second 3 times; you can change this repeat count between 1 and 0 
seconds 10 times. Once the repeat count is reached, the configured transmit interval value is 
used between LLDPDUs. Use the following command to configure the repeat count:

configure lldp med fast-start repeat-count <count>

The fast-start feature is automatically enabled, at the default level of 

3, when you enable the LLDP MED capabilities TLV on the port.

You must enable SNMP traps separately for the LLDP MED traps; they are disabled by 
default. To enable the LLDP MED SNMP traps, issue the following command:

enable snmp traps lldp-med {ports [all | <port_list>]}

In addition, the switch can receive, but not transmit, the LLDP MED inventory management 
TLVs. (See 

 for a listing of these inventory management TLVs.)

LLDP Packets 

You can configure the device to transmit messages, to receive messages, or both.

LLDP is enabled and configured per port. 

Multiple advertisements messages (or TLVs) are transmitted in one LAN packet, the LLDPDU 
(

). The LLDP packet contains the destination multicast address, the source MAC 

address, the LLDP EtherType, the LLDPDU data, and a frame check sequence (FCS). The 
LLDP multicast address is defined as 01:80:C2:00:00:0E, and the EtherType is defined as 
0x88CC.

The following characteristics apply to LLDP packets:

They are IEEE 802.3 Ethernet frames.

LLDP_Multicast

Address

Source MAC

Address

88-CC

LLDPDU

Data + Pad

Ethertype

SA

DA

1500

2

4

Octets

6

6

FCS

XOS005