User's Manual

286
Chapter 39 PDP Overview
39.1 Overview
PDP is specially used to discover network equipment, that is, it is used to find all neighbors of a known device.
Through PDP, the network management program can use SNMP to query neighboring devices to acquire
network topology.
Our company’s switches can discover the neighboring devices but they do not accept SNMP queries.
Therefore, switches only run at the edge of network, or they cannot acquire a complete network topology.
PDP can be set on all SNAPs (e.g. Ethernet).
39.2 PDP Configuration Tasks
 Default PDP Configuration
 Setting the PDP Clock and Information Storage
 Setting the PDP Version
 Starting PDP on a Switch
 Starting PDP on a Port
 PDP Monitoring and Management
39.2.1 Default PDP Configuration
Function Default Settings
Global configuration mode This function is not enabled by default.
Interface configuration mode
Starts up.
PDP clock (packet transmission frequency)
60 seconds
PDP information storage
180 seconds
PDP version
2
39.2.2 Setting the PDP Clock and Information Storage
To set the PDP packet transmission frequency and the PDP information storage time, you can run the following
commands in global configuration mode.
Command Purpose
pdp timer seconds
Sets the transmission frequency of the PDP packets.
pdp holdtime seconds
Sets the PDP information storage time.