H3C Technologies H3C S3100 Series Switches - Manual (Page 919)

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dynamically learned neighbors reaches the threshold, the interface will stop learning neighbor
information.
Table 1-7 Configure the maximum number of neighbors dynamically learned:
To do… Use the command… Remarks
Enter system view system-view —
Enter VLAN interface view
interface interface-type
interface-number
—
Configure the maximum number of
neighbors dynamically learned by
an interface
ipv6 neighbors
max-learning-num number Optional
The default value is 2,048
Configure the attempts to send an ns message for duplicate address detection
The device sends a neighbor solicitation (NS) message for duplicate address detection. If the device
does not receive a response within a specified time (set by the ipv6 nd ns retrans-timer command),
the device continues to send an NS message. If the device still does not receive a response after the
number of attempts to send an NS message reaches the maximum, the device judges the acquired
address is available.
Table 1-8 Configure the attempts to send an NS message for duplicate address detection
To do… Use the command… Remarks
Enter system view system-view —
Enter VLAN interface view
interface interface-type
interface-number
—
Configure the attempts to send an
NS message for duplicate address
detection
ipv6 nd dad attempts value
Optional
1 by default. When the value
argument is set to 0, the duplicate
address detection is disabled.
Configure the NS Interval
After a device sends an NS message, if it does not receive a response within a specific period, the
device will send another NS message. You can configure the interval for sending NS messages.
Table 1-9 Configure the NS interval
To do… Use the command… Remarks
Enter system view system-view —
Enter VLAN interface view
interface interface-type
interface-number
—
Specify the NS interval ipv6 nd ns retrans-timer value
Optional
1,000 milliseconds by default
Configure the neighbor reachable timeout time on an interface
After a neighbor passed the reachability detection, the device considers the neighbor to be reachable in
a specific period. However, the device will examine whether the neighbor is reachable again when there
is a need to send packets to the neighbor after the neighbor reachable timeout time elapsed.