H3C Technologies H3C S5120 Series Switches - Manual (Page 680)

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The time for the receiving device to hold NDP packets cannot be shorter than the interval for sending
NDP packets; otherwise, the NDP table may become instable.
Enabling NTDP Globally and for Specific Ports
For NTDP to work normally, you must enable NTDP both globally and on specific ports.
Follow these steps to enable NTDP globally and for specific ports:
To do… Use the command… Remarks
Enter system view system-view —
Enable NTDP globally ntdp enable
Optional
Enabled by default
Enter Ethernet interface view or
Layer 2 aggregate interface
view
interface interface-type
interface-number
—
Enable NTDP for the port ntdp enable
Optional
NTDP is enabled on all ports by
default.
You are recommended to disable NTDP on the port which connects with the devices that do not need to
join the cluster, preventing the management device from adding the device which needs not to join the
cluster and collecting the topology information of this device.
Configuring NTDP Parameters
By configuring the maximum hops for collecting topology information, you can get topology information
of the devices in a specified range, thus avoiding unlimited topology collection.
After the interval for collecting topology information is configured, the device collects the topology
information at this interval.
To avoid network congestion caused by large amounts of topology responses received in short periods:
z Upon receiving an NTDP topology collection request, a device does not forward it, instead, it waits
for a period of time and then forwards the NTDP topology collection request on its first
NTDP-enabled port.
z 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 previous port forwards the NTDP
topology collection request.
Follow these steps to configure NTDP parameters: