l V: content value
The LLDPDU carries different types of TLVs to meet the LLDP interaction requirements. The
device sends or receives the local and remote information by using these TLVs.
The LLDPDU starts with Chassis ID TLV, Port ID TLV, and Time to Live TLV, and ends with
End of LLDPDU TLV; therefore, these four TLVs are mandatory for an LLDPDU. The other
TLVs are optional. The device can add and remove the optional TLVs.
2.2 LLDP Feature Supported by the S5700
This section describes the usage scenarios of the LLDP feature and TLV types supported by the
S5700.
Usage Scenario
The LLDP feature of the S5700 is applicable to three types of networks.
The network where an interface has only one neighbor
The interfaces between two switches or the interfaces between a switch and a media endpoint
(ME) are directly connected, so each interface has only one neighbor. As shown in Figure
2-4, SwitchA is directly connected to SwitchB and ME. Each interface on SwitchA and
SwitchB has only one neighbor.
Figure 2-4 Each interface has only one neighbor
Internet
Switch A
Switch B ME
NMS
The network where an interface has multiple neighbors
The interfaces between two switches are connected through an unknown network, so each
interface has multiple neighbors. As shown in Figure 2-5, SwitchA, SwitchB, and SwitchC are
connected through an unknown network. The devices on the unknown network may not have
the LLDP function or not be managed by the network management system (NMS); however,
they must have the ability to transparently transmit LLDP packets. On this network, each
interface of SwitchA, SwitchB, and SwitchC has multiple neighbors.
Quidway S5700 Series Ethernet Switches
Configuration Guide - Network Management 2 LLDP Configuration
Issue 01 (2011-10-26) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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