HP VPN Firewall Appliances Network Management Configuration Guide
689
Parameters Descri
p
tion
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 must send a packet to the neighbor after the specified reachable time
expires, the device reconfirms whether the neighbor is reachable.
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 through 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.
Enabling 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.
Configuring parameters related to RA messages
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Configure the hop limit.
ipv6 nd hop-limit value
Optional.
64 by default.
3. Enter interface view.
interface interface-type
interface-number
N/A
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 (7 days).