Introduction To Ntdp; Introduction To Cluster Roles - Huawei Quidway S3100 Series Operation Manual

Operation Manual – Stack&Cluster
Quidway S3100 Series Ethernet Switches
A device with NDP enabled maintains an NDP information table. Each entry in an NDP
table ages with time. You can also clear the current NDP information manually to have
adjacent information collected again.
A device with NDP enabled broadcasts NDP packets regularly through all its ports that
are in up state. An NDP packet carries the holdtime, which indicates the period for the
receiving devices to keep the information the packet carries. Receiving devices only
store the information carried in the received NDP packets rather than forward them.
The corresponding data entry in the NDP table is updated when the information carried
in a received NDP packet if the received information differs from the existing one,
otherwise, only the holdtime of the corresponding entry is updated.

2.1.4 Introduction to NTDP

NTDP is a protocol for network topology information collection. NTDP provides the
information about the devices that can be added to clusters and collects the topology
information within the specified hops for cluster management.
Based on the NDP information table created by NDP, NTDP transmits and forwards
NTDP topology collection request to collect the NDP information and neighboring
connection information of each device in a specific network range for the management
device or the network administrator to implement needed functions.
Upon detecting a change occurred on a neighbor, a member device informs the
management device of the change through handshake packets. The management
device then collects the specified topology information through NTDP. Such a
mechanism enables topology changes to be tracked in time.
Note:
As for NTDP implementing, you need to perform configurations on the management
device, the member devices, and the candidate devices as follows:
On the management device, enable NTDP both globally and for specific ports, and
configure the NTDP settings.
On each member device and candidate device, enable NTDP both globally and for
specific ports. As member devices and candidate devices adopt the NTDP settings
configured for the management device, NTDP setting configurations are not
needed.

2.1.5 Introduction to Cluster Roles

A cluster has one (and only one) management device. Note the following when creating
a cluster:
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Chapter 2 Cluster