HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Configuration G - Page 139

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

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Step Command Remarks 9. Set the NS retransmission timer. ipv6 nd ns retrans-timer value By default, an interface sends NS messages every 1000 milliseconds, and the value of the Retrans Timer field in RA messages is 0. 10. Set the router preference in ipv6 nd router-preference { high By default, the router preference is RA messages. | low | medium } medium. 11. Set the reachable time. ipv6 nd nud reachable-time value By default, the neighbor reachable time is 30000 milliseconds, and the value of the Reachable Time field in sent RA messages is 0. Configuring the maximum number of attempts to send an NS message for DAD An interface sends an NS message for DAD after obtaining an IPv6 address. If the interface does not receive a response within the time specified by the ipv6 nd ns retrans-timer command, it sends an NS message again. If the interface still does not receive a response after the number of attempts reaches the threshold specified by the ipv6 nd dad attempts command, it considers the address is usable. To configure the attempts to send an NS message for DAD: Step 1. Enter system view. 2. Enter interface view. 3. Configure the number of attempts to send an NS message for DAD. Command system-view interface interface-type interface-number ipv6 nd dad attempts value Remarks N/A N/A The default setting is 1. When the value argument is set to 0, DAD is disabled. Configuring path MTU discovery Configuring the interface MTU IPv6 switches do not support packet fragmentation. If the size of a packet exceeds the MTU of the output interface, the switch discards the packet and sends a Packet Too Big message to the source host. The source host fragments the packet according to the MTU. To avoid this situation, configure a proper interface MTU. To configure the interface MTU: Step 1. Enter system view. 2. Enter interface view. Command system-view interface interface-type interface-number Remarks N/A N/A 131

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131
Step
Command
Remarks
9.
Set the NS retransmission
timer.
ipv6 nd ns retrans-timer
value
By default, an interface sends NS
messages every 1000 milliseconds, and
the value of the Retrans Timer field in RA
messages is 0.
10.
Set the router preference in
RA messages.
ipv6 nd router-preference
{
high
|
low
|
medium
}
By default, the router preference is
medium.
11.
Set the reachable time.
ipv6 nd nud reachable-time
value
By default, the neighbor reachable time
is 30000 milliseconds, and the value of
the Reachable Time field in sent RA
messages is 0.
Configuring the maximum number of attempts to send an NS
message for DAD
An interface sends an NS message for DAD after obtaining an IPv6 address. If the interface does not
receive a response within the time specified by the
ipv6 nd ns retrans-timer
command, it sends an NS
message again. If the interface still does not receive a response after the number of attempts reaches the
threshold specified by the
ipv6 nd dad attempts
command, it considers the address is usable.
To configure the attempts to send an NS message for DAD:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view.
interface
interface-type
interface-number
N/A
3.
Configure the number of
attempts to send an NS
message for DAD.
ipv6 nd dad attempts
value
The default setting is 1. When the
value
argument is set to 0, DAD is
disabled.
Configuring path MTU discovery
Configuring the interface MTU
IPv6 switches do not support packet fragmentation. If the size of a packet exceeds the MTU of the output
interface, the switch discards the packet and sends a Packet Too Big message to the source host. The
source host fragments the packet according to the MTU. To avoid this situation, configure a proper
interface MTU.
To configure the interface MTU:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view.
interface
interface-type
interface-number
N/A