Configuring The Maximum Number Of Attempts To Send An Ns Message For Dad; Configuring Pmtu Discovery; Configuring A Static Pmtu For A Specified Ipv6 Address - HP A7500 Series Configuration Manual

NOTE:
The maximum interval for sending RA messages should be less than (or equal to) the router lifetime in
•
RA messages, so the router can be updated through an RA message before expiration.
The values of the NS retransmission timer and the reachable time configured for an interface are sent to
•
hosts via RA messages. Furthermore, this interface sends NS messages at the interval of the NS
retransmission timer and considers a neighbor reachable within the reachable time.
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.
Follow these steps to configure the attempts to send an NS message for DAD:
To do...
Enter system view
Enter interface view
Configure the number of attempts
to send an NS message for DAD

Configuring PMTU discovery

Configuring a static PMTU for a specified IPv6 address

You can configure a static PMTU for a specified destination IPv6 address. When a source host sends a
packet through an interface, it compares the interface MTU with the static PMTU of the specified
destination IPv6 address. If the packet size is larger than the smaller one of the two values, the host
fragments the packet according to the smaller value.
Follow these steps to configure a static PMTU for a specified IPv6 address:
To do...
Enter system view
Configure a static PMTU for a
specified IPv6 address
Use the command...
system-view
interface interface-type
interface-number
ipv6 nd dad attempts value
Use the command...
system-view
ipv6 pathmtu [ vpn-instance
vpn-instance-name ] ipv6-address
[ value ]
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Remarks
—
—
Optional
1 by default. When the value
argument is set to 0, DAD is
disabled.
Remarks
—
Required
Not configured by default