Introduction To Ntdp - H3C S7500 Series Operation Manual

Operation Manual – Cluster
H3C S7500 Series Ethernet Switches
An NDP-enabled device 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.
An NDP-enabled device broadcasts NDP packets regularly to all active ports. An NDP
packet carries the holdtime field, which indicates the period for the receiving devices to
keep the NDP data. Receiving devices store only the information carried in the received
NDP packets rather than forward them. The corresponding data entry in the NDP table
is updated when the received information is different from the existing one. Otherwise,
only the holdtime of the corresponding entry is updated.

1.1.3 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 requests 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 required 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.
NTDP takes effect in the management VLAN only. S7500 series Ethernet switches
take VLAN 1 as the management VLAN, that is, the NTDP function of the S7500
series takes effect in VLAN 1 only.
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Chapter 1 Cluster