HP VPN Firewall Appliances Network Management Configuration Guide

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Setting the age timer for ND entries in stale state
ND entries in stale state have an age timer. If an ND entry in stale state is not refreshed before the timer
expires, it transits to the delay state. If it is still not refreshed in 5 seconds, the ND entry transits to the
probe state, and the device sends an NS message for detection. If no response is received, the device
removes the ND entry.
To set the age timer for ND entries in stale state:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Set the age timer for ND
entries in stale state.
ipv6 neighbor stale-aging
aging-time
Optional.
4 hours by default.
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. Table 80 lists and d
escribes the confi
gurable parameters in an RA
message.
Table 77 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 Guarantees 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 retransmits the NS message.