R3721-F3210-F3171-HP High-End Firewalls Network Management Configuration Guide-6PW101

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Table 86 Parameters in an RA message and their descriptions
Parameters Descri
p
tion
Cur Hop Limit
When sending an IPv6 packet, a host uses the value to fill the Hop Limit field in IPv6
headers. The value is also filled into the Hop Limit field in the response packet of a
device.
Prefix Information
options
After receiving the prefix information, the hosts on the same link can perform
stateless autoconfiguration.
MTU Make sure that all nodes on a link use the same MTU value.
M flag
Determines whether hosts use the stateful autoconfiguration to acquire IPv6
addresses.
If the M flag is set to 1, hosts use the stateful autoconfiguration (for example, through
a DHCP server) to acquire IPv6 addresses. Otherwise, hosts use the stateless
autoconfiguration to acquire IPv6 addresses and generate IPv6 addresses
according to their own link-layer addresses and the obtained prefix information.
O flag
Determines whether hosts use stateful autoconfiguration to acquire other
configuration information.
If the O flag is set to 1, hosts use stateful autoconfiguration (for example, through a
DHCP server) to acquire other configuration information. Otherwise, hosts use
stateless autoconfiguration to acquire other configuration information.
Router Lifetime This field tells the receiving hosts how long the advertising device can live
Retrans Timer
If the device fails to receive a response message within the specified time after
sending an NS message, it will retransmit the NS message.
Reachable Time
If the neighbor reachability detection shows that a neighbor is reachable, the
device considers the neighbor reachable within the specified reachable time. If the
device needs to send a packet to the neighbor after the specified reachable time
expires, the device will reconfirm whether the neighbor is reachable.
To allow sending of RA messages:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface
view.
interface interface-type
interface-number
N/A
3. Disable RA
message
suppression.
undo ipv6 nd ra halt By default, RA messages are suppressed.
4. Configure the
maximum and
minimum intervals
for sending RA
messages.
ipv6 nd ra interval
max-interval-value
min-interval-value
Optional.
By default, the maximum interval for sending
RA messages is 600 seconds, and the
minimum interval is 200 seconds.
The device sends RA messages at random
intervals between the maximum interval and
the minimum interval.
The minimum interval should be less than or
equal to 0.75 times the maximum interval.