Huawei AR150/200 Series Configuration Manual page 70

Huawei AR150&200 Series Enterprise Routers
Configuration Guide - Network Management
LLDP Trap
When information in the LLDP local system MIB or the LLDP remote system MIB changes,
the device sends traps to the NMS, requesting the NMS to update the topology. The information
changes include:
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The LLDP trap function is applied to all interfaces.
LLDP Packet
Figure 3-2
Figure 3-2 LLDP packet format
LLDP_Multicast
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LLDPDU in the LLDP packet contains the Layer 2 information discovered by the device, so it
is the most important part in the LLDP packet.
Figure 3-3
Figure 3-3 LLDPDU structure
Chassis ID
The basic unit in the LLDPDU is TLV.
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Issue 02 (2012-03-30)
Change of global LLDP status
Change of local management address
Change of neighbor information, excluding the change of neighbor management address
shows the LLDP packet format.
DA
MAC
address address
6 octects 6 octects
DA: indicates the destination address of the LLDP packet. It is the multicast address 01-80-
C2-00-00-0E.
SA: indicates the bridge MAC address of the neighbor device.
LLDP Ethertype: indicates the LLDP packet type. If a packet contains this field, it is an
LLDP packet and it is sent to the LLDP module. The value of this field is 0x88CC.
LLDPDU: indicates the LLDP data unit. It is the major content of an LLDP packet.
FCS: indicates the Frame Check Sequence.
shows the LLDPDU structure.
Port ID Time to
TLV TLV Live TLV
M M M
T: information type
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LLDP
SA
Ethertype
88-cc
2 octects
Optional
...
TLV
3 LLDP Configuration
Data + pad
LLDPDU
1500 octects
End of
Optional
LLDPDU
TLV
TLV
C
FCS
4 octects
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