H3C Technologies H3C S7500E Series Switches - Manual (Page 137)

13-18
To do… Use the command… Remarks
Set the NS retransmission timer ipv6 nd ns retrans-timer value
Optional
By default, the local interface sends NS
messages at an interval of 1000
milliseconds, and the value of the
Retrans Timer field in RA messages
sent by the local interface is 0.
Set the reachable time
ipv6 nd nud reachable-time
value
Optional
By default, the neighbor reachable time
on the local interface is 30000
milliseconds, and the value of the
Reachable Timer field in RA messages
is 0.
z The maximum interval for sending RA messages should be less than or equal to the router lifetime
in RA messages.
z In VRRP networking, the source MAC address in an NA message is always different from that in
the link layer address option at present, and therefore the consistency check on the MAC address
of ND packets cannot be enabled.
Configuring the Maximum Number of Attempts to Send an NS Message for DAD
An interface sends a neighbor solicitation (NS) message for duplicate address detection after acquiring
an IPv6 address. If the interface does not receive a response within a specified time (determined by
the ipv6 nd ns retrans-timer command), it continues to send an NS message. If it still does not
receive a response after the number of sent attempts reaches a configurable threshold, the acquired
address is considered usable.
Follow these steps to configure the attempts to send an NS message for DAD:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Configure the number of attempts
to send an NS message for DAD
ipv6 nd dad attempts value
Optional
1 by default. When the value
argument is set to 0, DAD is
disabled.