H3C Technologies H3C S5560 Series Switches - Manual (Page 168)

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Parameter Description
Router Preference
Specifies the router preference in a RA message. A host selects a router as the
default gateway according to the router preference. If router preferences are the
same, the host selects the router from which the first RA message is received.
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 by an RA message before expiration.
The values of the NS retransmission timer and the reachable time configured for an interface are sent in
RA messages to hosts. 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
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable sending of RA
messages.
undo ipv6 nd ra halt The default setting is disabled.
4. Configure the maximum and
minimum intervals for sending
RA messages.
ipv6 nd ra interval
max-interval-value
min-interval-value
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 for RA messages
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 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 ] *
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. If the IPv6 address is
manually configured, the prefix uses a
fixed valid lifetime of 2592000 seconds
(30 days) and a preferred lifetime of
604800 seconds (7 days). If the IPv6
address is automatically obtained, the
prefix uses the valid lifetime and
preferred lifetime configured for the IPv6
address.