3Com Switch 8800 Family Configuration Guide

720 CHAPTER 60: NDP CONFIGURATION
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■ On the management device, NDP must be enabled in the system and on the
ports.
■ On member devices and candidate devices, the NPD feature must also be
enabled in the system and on the corresponding ports. The aging timer for the
NDP information sent from the management device is used during NDP
operation.
Enabling NDP in the
System
To collect the NDP information sent by the neighbor device, you must enable NDP
on the switch. With NDP enabled in the system, the switch periodically collects
NDP information, which you can query by using the display ndp command. With
NDP disabled in the system, the switch clears all NDP neighbor information stored
on it but will still forwards NDP packets.
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When you try to enable NDP on all ports, NDP is enabled only on the common
Ethernet ports and Gigabit Ethernet ports that support NDP interface modules.
Configuring NDP on a
Port
You can control the collection of neighbor device information for the specified
port by enabling/disabling NDP on the port. With NDP enabled on the port and in
the system, the system periodically collects the NDP neighbor information about
the adjacent node of the port. With NDP disabled on the port, the system cannot
collect NDP information through the port.
Configuring the Aging
Timer for NDP
Information
Upon receipt of NDP packets, from the aging timer information carried in the
packets, the switch can learn about the aging timer for the NDP information of
the neighbor device that sent the packets and discards the NDP information of the
neighbor device once the aging timer is exceeded. This configuration allows you to
set the aging timer for the NDP information of the current device on the neighbor
device.
Tabl e 664 Enable NDP in the system
Operation Command Description
Enter system view system-view -
Enable NDP in the system
ndp enable [ interface
port-list | all ]
By default, NDP is disabled in
the system.
Tabl e 665 Enable NDP on a port
Operation Command Description
Enter system view system-view -
Enter Ethernet port view
interface interface-type
interface-number
Currently, only common
Ethernet interface modules
and Gigabit Ethernet interface
modules support NDP.
Enable NDP on the port ndp enable
By default, NDP is disabled on
a port.
Tabl e 666 Configure the aging timer for NDP information
Operation Command Description
Enter system view system-view -