Configuring Parameters Related To Ra Messages - HP 830 Series Configuration Manual

Step
3. Configure the maximum
number of neighbors that can
be learned dynamically by an
interface.

Configuring parameters related to RA messages

You can enable an interface to send RA messages, and configure the interval for sending RA messages
and parameters in RA messages. After receiving an RA message, a host can use these parameters to
perform corresponding operations.
message.
Table 8 Parameters in an RA message and their descriptions
Parameters
Cur Hop Limit
Prefix Information
options
MTU
M flag
O flag
Router Lifetime
Retrans Timer
Reachable Time
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.
Command
ipv6 neighbors max-learning-num
number
Table 8 lists and describes the configurable parameters in an RA
Description
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.
After receiving the prefix information, the hosts on the same link can perform
stateless autoconfiguration.
Guarantees that all nodes on a link use the same MTU value.
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.
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.
This field tells the receiving hosts how long the advertising device can live.
If the device fails to receive a response message within the specified time after
sending an NS message, it retransmits the NS message.
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.
106
Remarks
Optional.
By default, a Layer 2 interface does
not limit the number of neighbors
dynamically learned. A Layer 3
interface can dynamically learn a
maximum of 256 neighbors.