АМАТЕК AN-SGM28P24-400 [259/322] Ntdp profile

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will automatically delete the corresponding neighbor table entry。

21.1.4 NTDP profile

NTDP is used to collect the information of each device and the connection information

between devices in a certain network range. NTDP provides device information for management

devices that can join the cluster and collects topological information of the devices within the

specified hop count。

NDP provides adjacency list information for NTDP, NTDP sends and forwards NTDP

topology collection request according to adjacency information, collects NDP information of each

device in a certain network range and its connection information with all neighbors. After

collecting the information, the management equipment or network management can use the

information according to the need to complete the required functions. When a member device

NDP neighbor discovery has changed, the handshake message will notify neighbor management

equipment change, management of equipment can start NTDP for the specified topology

collection, so that the NTDP can reflect the change of network topology。

The management device can periodically collect topology in the network, and the user can

initiate a topology collection by manually configuring commands. Management equipment

collects topological information process as follows：

 The management device sends the NTDP topology to collect the request packets from

the ports that enable the NTDP function。

 Receive the request message immediately send response message to the topology of

equipment management equipment, and has the function of NTDP in the port of a copy of the

request message and sends it to the adjacent equipment; the response message contains the

topological equipment basic information and all adjacent equipment information NDP。

 The neighbor device receives the request message and executes the same operation until

the topology collects the request packets to all devices within the specified hop range。

When the topology collection request message diffusion within the network, a large number

of network equipment also received the request and send topology topology collection response

message, in order to avoid network congestion and task management device is busy, you can take

the following measures to control the topology collection request message diffusion speed：

 After receiving the topology collection request, the device does not immediately forward

the topology collection request packet, but delays waiting for a certain time, and then begins to

forward the topology collection request packet at the port enabling the NTDP function。

 On the same device, except for the first port, each port enabled the NTDP function to

send the topology collection request message at the previous port, and then it will delay a certain