HP 4800G Series Configuration Manual page 349

Table 1-4 Parameters in an RA message and their descriptions
Parameters
Cur hop limit
Prefix information
options
M flag
O flag
Router lifetime
Retrans timer
Reachable time
The values of the Retrans Timer and the Reachable Time configured for an interface are sent to hosts
via RA messages. Furthermore, this interface sends NS messages at the interval of Retrans Timer and
considers a neighbor reachable within the Reachable Time.
Follow these steps to configure parameters related to an RA message:
To do...
Enter system view
Configure the hop limit
Enter interface view
When sending an IPv6 packet, a host uses the value to fill the Cur Hop Limit
field in IPv6 headers. The value is also filled into the Cur Hop Limit field in
response messages of a device.
After receiving the prefix information advertised by the device, the hosts on
the same link can perform stateless autoconfiguration.
This field determines whether hosts use the stateful autoconfiguration to
acquire IPv6 addresses.
If the M flag is set to 1, hosts use the stateful autoconfiguration to acquire
IPv6 addresses (for example, through a DHCP server). Otherwise, hosts
use the stateless autoconfiguration to acquire IPv6 addresses, that is,
hosts generate IPv6 addresses according to their own link-layer addresses
and the prefix information issued by the router.
This field determines whether hosts use the stateful autoconfiguration to
acquire information other than IPv6 addresses.
If the O flag is set to 1, hosts use the stateful autoconfiguration to acquire
information other than IPv6 addresses (for example, through a DHCP
server). Otherwise, hosts use the stateless autoconfiguration to acquire
information other than IPv6 addresses.
This field is used to set the lifetime of the router that sends RA messages to
serve as the default router of hosts. According to the router lifetime in the
received RA messages, hosts determine whether the router sending RA
messages can serve as the default router.
If the device fails to receive a response message within the specified time
after sending an NS message, the device will retransmit 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 needs to send a packet to a neighbor after the specified
reachable time expires, the device will reconfirm whether the neighbor is
reachable.
Use the command...
system-view
ipv6 nd hop-limit value
interface interface-type
interface-number
1-13
Description
Remarks
—
Optional
64 by default.
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