HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 102

Configuring the maximum number of attempts to send an NS message for DAD, Command, Remarks

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Step 4. Configure the prefix information in RA messages. Command ipv6 nd ra prefix { ipv6-prefix prefix-length | ipv6-prefix/prefix-length } valid-lifetime preferred-lifetime [ no-autoconfig | off-link ] * 5. Turn off the MTU option in RA messages. ipv6 nd ra no-advlinkmtu 6. Set the M flag bit to 1. ipv6 nd autoconfig managed-address-flag 7. Set the O flag bit to 1. ipv6 nd autoconfig other-flag 8. Configure the router lifetime in RA messages. ipv6 nd ra router-lifetime value 9. Set the NS retransmission timer. ipv6 nd ns retrans-timer value 10. Set the reachable time. ipv6 nd nud reachable-time value Remarks Optional. By default, no prefix information is configured for RA messages, and the IPv6 address of the interface sending RA messages is used as the prefix information with valid lifetime 2592000 seconds (30 days) and preferred lifetime 604800 seconds (seven days). Optional. By default, RA messages contain the MTU option. Optional. By default, the M flag bit is set to 0 and hosts acquire IPv6 addresses through stateless autoconfiguration. Optional. By default, the O flag bit is set to 0 and hosts acquire other configuration information through stateless autoconfiguration. Optional. 1800 seconds by default. Optional. By default, the local interface sends NS messages at 1000 millisecond intervals, and the value of the Retrans Timer field in RA messages sent by the local interface is 0. The interval for retransmitting an NS message is determined by the receiving device. Optional. By default, the neighbor reachable time on the local interface is 30000 milliseconds, and the value of the Reachable Time field in the RA messages sent by the local interface is 0. The neighbor reachable time is determined by the receiving device. Configuring the maximum number of attempts to send an NS message for DAD An interface sends an NS message for DAD 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 the interface still does not receive a response after the number of sent attempts reaches the threshold (specified with the ipv6 nd dad attempts command), the acquired address is considered usable. 94

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94
Step
Command
Remarks
4.
Configure the prefix
information in RA
messages.
ipv6 nd ra prefix
{
ipv6-prefix
prefix-length
|
ipv6-prefix
/
prefix-length
}
valid-lifetime preferred-lifetime
[
no-autoconfig
|
off-link
] *
Optional.
By default, no prefix information is
configured for RA messages, and the
IPv6 address of the interface sending RA
messages is used as the prefix
information with valid lifetime 2592000
seconds (30 days) and preferred lifetime
604800 seconds (seven days).
5.
Turn off the MTU option in
RA messages.
ipv6 nd ra no-advlinkmtu
Optional.
By default, RA messages contain the
MTU option.
6.
Set the M flag bit to 1.
ipv6 nd autoconfig
managed-address-flag
Optional.
By default, the M flag bit is set to 0 and
hosts acquire IPv6 addresses through
stateless autoconfiguration.
7.
Set the O flag bit to 1.
ipv6 nd autoconfig other-flag
Optional.
By default, the O flag bit is set to 0 and
hosts acquire other configuration
information through stateless
autoconfiguration.
8.
Configure the router
lifetime in RA messages.
ipv6 nd ra router-lifetime
value
Optional.
1800 seconds by default.
9.
Set the NS retransmission
timer.
ipv6 nd ns retrans-timer
value
Optional.
By default, the local interface sends NS
messages at 1000 millisecond intervals,
and the value of the Retrans Timer field
in RA messages sent by the local
interface is 0. The interval for
retransmitting an NS message is
determined by the receiving device.
10.
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 Time field in the RA messages
sent by the local interface is 0. The
neighbor reachable time is determined
by the receiving device.
Configuring the maximum number of attempts to send an NS
message for DAD
An interface sends an NS message for DAD 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 the interface still does not receive a response after the number of
sent attempts reaches the threshold (specified with the
ipv6 nd dad attempts
command), the acquired
address is considered usable.