H3c-technologies H3C S5120 Series Switches User Manual download pdf (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:

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H3c-technologies H3C S5120 Series Switches User Manual Page 680

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