H3C S3610-28P Operation Manual page 1135

Operation Manual – Cluster Management
H3C S3610&S5510 Series Ethernet Switches
The management device periodically sends NTDP topology collection request
from the NTDP-enabled ports.
Upon receiving the request, the device sends NTDP topology collection response
to the management device, copies this response packet on the NTDP-enabled
port and sends it to the adjacent device. Topology collection response includes the
basic information of the NDP-enabled device and NDP information of all adjacent
devices.
The adjacent device performs the same operation until the NTDP topology
collection request is sent to all the devices within specified hops.
When the NTDP topology collection request is advertised in the network, large
numbers of network devices receive the NTDP topology collection request and send
NTDP topology collection response at the same time, which may cause congestion and
the management device busyness. To avoid such case, the following methods can be
used to control the speed of the NTDP topology collection request advertisement:
Upon receiving an NTDP topology collection request the device does not forward it,
instead, it waits for a period of time and then forwards the NTDP topology
collection request on the first NTDP-enabled port.
On the same device, except the first port, each NTDP-enabled port waits for a
period of time and then forwards the NTDP topology collection request after the
port before it sends the NTDP topology collection request.
III. Cluster management maintenance
1) Adding a candidate device to a cluster
You should specify the management device before creating a cluster. The
management device discovers and defines a candidate device through NDP and NTDP
protocols. The candidate device can be automatically or manually added to the cluster.
After the candidate device is added to the cluster, it can obtain the member number
assigned by the management device and the private IP address used for cluster
management.
2) Communication within a cluster
In a cluster the management device communicates with its member devices by sending
handshake packets to maintain connection between them. The management/member
device state change is shown in
Chapter 1 Cluster Management Configuration
Figure 1-3.
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