3Com Switch 8800 Advanced Software V5 Configuration Guide

224 CHAPTER 23: IPV6 BASICS CONFIGURATION
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The values of the Retrans Timer field and the Reachable Time field configured for
an interface are sent to hosts via RA messages. Furthermore, this interface sends
NS messages at intervals of Retrans Timer and considers a neighbor reachable
within the time of Reachable Time.
Follow these steps to configure parameters related to an RA message:
Tabl e 22 Parameters in an RA message and their descriptions
Parameters Description
Cur hop limit When sending an IPv6 packet, a host uses the
value of this parameter to fill the Cur Hop Limit
field in IPv6 headers. Meanwhile, the value of
this parameter is equal to the value of the Cur
Hop Limit field in response messages of the
device.
Prefix information options After receiving the prefix information advertised
by the device, the hosts on the same link can
perform stateless autoconfiguration operations.
M flag 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.
Otherwise, hosts use the stateless
autoconfiguration to acquire IPv6 addresses,
that is, hosts configure IPv6 addresses according
to their own link-layer addresses and the prefix
information issued by the router.
O flag 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 (for example, DHCP server) to
acquire information other than IPv6 addresses.
Otherwise, hosts use the stateless
autoconfiguration to acquire information other
than IPv6 addresses.
Router lifetime 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 of hosts.
Retrans timer If the device fails to receive a response message
within the specified time after sending an NS
message, the device will retransmit it.
Reachable time After the neighbor reachability detection shows
that a neighbor is reachable, the device
considers the neighbor is reachable within the
reachable time. If the device needs to send a
packet to a neighbor after the reachable time
expires, the device will again confirm whether
the neighbor is reachable.
To do... Use the command... Remarks
Enter system view system-view -