H3C Technologies H3C S12500 Series Switches - Manual (Page 131)

118
Step Command Remarks
6. Set the M flag bit to 1.
ipv6 nd autoconfig
managed-address-flag
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
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
By default, the router lifetime is 1800
seconds.
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.
268B
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.
121B
Configuring path MTU discovery
269B
Configuring the interface MTU
IPv6 routers do not support packet fragmentation. If the size of a packet exceeds the MTU of the output
interface, the router discards the packet and sends a Packet Too Big message to the source host. The