Manually Collecting Topology Information - HP 4800G Series Configuration Manual

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:
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.
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:
To do...
Enter system view
Configure the maximum hops
for topology collection
Configure the interval to collect
topology information
Configure the delay to forward
topology-collection request
packets on the first port
Configure the port delay to
forward topology collection
request on other ports
The two delay values should be configured on the topology collecting device. A topology collection
request sent by the topology collecting device carries the two delay values, and a device that receives
the request forwards the request according to the delays.

Manually Collecting Topology Information

The management device collects topology information periodically after a cluster is created. In addition,
you can configure to manually initiate topology information collection, thus managing and monitoring
the device on real time, regardless of whether a cluster is created.
Follow these steps to configure to manually collect topology information:
Manually collect topology information
Use the command...
system-view
ntdp hop hop-value
ntdp timer interval-time
ntdp timer hop-delay time
ntdp timer port-delay time
To do... Use the command...
ntdp explore
1-9
Remarks
—
Optional
3 by default.
Optional
1 minute by default.
Optional
200 ms by default.
Optional
20 ms by default.
Remarks
Required