3com 8807 User Guide

The NDP information of the adjacent device must be updated periodically to 
ensure that the switch can update the local NDP neighbor information table in 
time after the configuration of the adjacent device is changed. You can configure 
the interval at which NDP packets are sent by using the following command.

After the above-mentioned configuration:

■

Use the display command in any view to display the operating state of the 
NDP and verify configuration result.

■

You can use the reset command to clear the statistics related to NDP in user 
view.

■

Switch A, Switch B, and Switch C are interconnected.

■

Ethernet1/1/1 on Switch A is connected to Ethernet 1/1/1 on Switch B and 
Ethernet 1/1/2 on Switch A is connected to Ethernet 1/1/1 on Switch C.

Configure the aging timer for 
NDP information 

ndp timer aging 
aging-in-secs 

By default, the aging timer for 
NDP information is 180 
seconds.

The aging timer for NDP 
information must be greater 
than or equal to the interval at 
which NDP packets are sent; 
otherwise, the NDP 
information table will be 
unstable.

Table 666   Configure the aging timer for NDP information

Table 667   Configure the interval at which NDP packets are sent

Enter system view 

system-view 

- 

Configure the interval at 
which NDP packets are sent 

ndp timer hello seconds 

By default, NDP packets are 
sent every 60 seconds.

The interval at which NDP 
packets are sent must be less 
than or equal to the aging 
timer for NDP information. 
Otherwise, the NDP 
information table will be 
unstable.

Table 668   Display and debug NDP

Display the NDP configuration of the system 
(including the interval at which packets are 
sent and the aging timer for NDP information 

display ndp 

Display the NDP neighbor information of the 
specified port 

display ndp interface port-list 

Clear the statistics of an NDP-enabled port 

reset ndp statistics [ interface port-list ]