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15.2 NTDP
NTDP (Neighbor Topology Discovery Protocol）is used for the commander switch to collect NDP
information. NTDP transmits and forwards NTDP topology collection request based on NDP
neighbor information table, and collects the NDP information and neighboring connection
information of each device in a specific network range. The commander switch can collects the
specified topology in the network regularly and you can also enable topology collection manually
on the commander switch.
After the commander switch sends out NTDP request packets, lots of switches receive the request
packets and send out response packets at the same time, which may result in network congestion
and the commander switch overload. To avoid the above problem, two time parameters are
designed to control the spread speed of NTDP request packets.
NTDP hop delay: Indicates the time between the switch receiving NTDP request packets and
the switch forwarding NTDP request packets for the first time.
NTDP port delay: Indicates the time between the port forwarding NTDP request packets and its
adjacent port forwarding NTDP request packets over.
The NTDP function can be implemented on Device Table, NTDP Summary and NTDP Config
pages.
15.2.1 Device Table
On this page you can view the information of the devices collected by NTDP. Meanwhile, no matter
whether a cluster is established, on this page you can manually collect NTDP information at any
time to manage and control devices.
Choose the menu Cluster→NTDP→Device Table to load the following page.
Figure 15-5 Device Table
The following entries are displayed on this screen:
Device Table
Device Type: Displays the device description collected through NTDP.
Device MAC: Displays the MAC address of this device.
Cluster Name: Displays the cluster name of this device.
Role: Displays the role this device plays in the cluster.
Commander: Indicates the device that can configure and
manage all the devices in a cluster.
Member: Indicates the device that is managed in a cluster.
Candidate: Indicates the device that does not belong to any
cluster though it can be added to a cluster.
Individual: Indicates the device with cluster feature disabled.
Hops: Displays the hop count from this device to the switch.
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