R3303-HP HSR6800 Routers Layer 3 - IP Services Configuration Guide

147
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Set the aging 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 9 lists and d
escribes the configurable parameters in an RA
message.
Table 9 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.
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.