(Optional) Configuring Probe Parameters for ND Entries in the PROBE State

This section describes how to configure probe parameters for ND entries in the PROBE state to enhance probe reliability.

Context

If an ND entry is in the PROBE state, the neighbor is no longer known to be reachable. The device sends unicast NS messages to detect the validity of the ND entry. If a response is received from the neighbor, the ND entry enters the REACH state, indicating that the neighbor is known to have been reachable. If no response is received from the neighbor, the ND entry is deleted.

You are advised to set probe parameters to larger values for ND entries in the PROBE state in the following situations. This prevents ND entries from being mistakenly deleted, hence negatively affecting packet forwarding efficiency if no response is received from the neighbor within the specified period (calculated as Default number of probe retransmissions x Default interval of probe retransmissions).

The link reliability on the network is poor, and packet loss may occur during packet transmission.
The peer device is busy processing services and cannot process NS messages in time.

Procedure

Run system-view
The system view is displayed.
Run interface interface-type interface-number
The interface view is displayed.
Run ipv6 enable
IPv6 is enabled for the interface.
Run ipv6 nd nud attempts attempts
The number of probe retransmissions is set for ND entries in the PROBE state.
Run ipv6 nd nud interval interval
A probe interval is set for ND entries in the PROBE state.
Run commit
The configuration is committed.