H3C Technologies H3C S3100 Series Switches - Manual (Page 426)

Operation Manual – Cluster
H3C S3100-52P Ethernet Switch Chapter 1 Cluster
1-3
will keep the NDP packet data. The receiving devices store the information carried in
the NDP packet into the NDP table but do not forward the NDP packet. When they
receive another NDP packet, if the information carried in the packet is different from the
stored one, the corresponding entry in the NDP table is updated, otherwise only the
holdtime of the entry is updated.
1.1.3 Introduction to NTDP
NTDP is a protocol used to collect network topology information. NTDP provides
information required for cluster management: it collects topology information about the
switches within the specified hop count, so as to provide the information of which
devices can be added to a cluster.
Based on the neighbor information stored in the neighbor table maintained by NDP,
NTDP on the management device advertises NTDP topology collection requests to
collect the NDP information of each device in a specific network range as well as the
connection information of all its neighbors. The information collected will be used by the
management device or the network management software to implement required
functions.
When a member device finds any change on its neighbors through its NDP table, it
informs the management device through handshake packets, and the management
device triggers its NTDP to perform specific topology collection, so that its NTDP can
discover topology changes in real time.
Note:
To implement NTDP, you need to enable NTDP globally and on specific ports on both
management device and member/candidate devices, and configure NTDP parameters
on only management device. You need not configure NTDP parameters on
member/candidate devices because they adopt NTDP parameter settings delivered
from the management device when NTDP is running.
1.1.4 Introduction to Cluster
A cluster must have one and only one management device. Note the following when
creating a cluster:
z
You need to designate a management device for the cluster. The management
device of a cluster is the portal of the cluster. That is, any operations from outside
the network intended for the member devices of the cluster, such as accessing,
configuring, managing, and monitoring, can only be implemented through the
management device.