Huawei S9300 Configuration Manual page 62

S9300&S9300E Terabit Routing Switch
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:
l
Change of global LLDP status
l Change of local management address
l Change of neighbor information, excluding the change of neighbor management address
The LLDP trap function is applied to all interfaces.
LLDP Packet
Figure 2-2
Figure 2-2 LLDP packet format
LLDP_Multicast
l DA: indicates the destination address of the LLDP packet. It is the multicast address 01-80-
C2-00-00-0E.
l
SA: indicates the bridge MAC address of the neighbor device.
l 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.
l LLDPDU: indicates the LLDP data unit. It is the major content of an LLDP packet.
l FCS: indicates the Frame Check Sequence.
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 2-3
Figure 2-3 LLDPDU structure
Chassis ID
The basic unit in the LLDPDU is TLV.
l
T: information type
Issue 01 (2012-03-15)
shows the LLDP packet format.
DA SA
MAC
address address
6 octets 6 octets
shows the LLDPDU structure.
Port ID
TLV TLV
M
M
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Copyright © Huawei Technologies Co., Ltd.
LLDP
Data+pad
Ethertype
88-CC LLDPDU
2 octets
1500 octets
Time to
Optional
Live TLV
TLV
M
2 LLDP Configuration
FCS
4 octets
End of
...
Optional
LLDPDU
TLV
TLV
C
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