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Auto settings of Address by Router Advertisement Message Reception
This device supports the reception function of Router Advertisement Message.
The prefix information used by the network is included in Router Advertisement Message. When prefix
information is received, prefix list to manage valid period is generated and the IPv6 address having the
interface ID is set automatically.
The received prefix information can be referred by show ipv6 ra prefix-list command. Moreover, the
automatically set IPv6 address can be referred by show ipv6 route or show interface command.
Points to be noted
• When multiple prefix information is received by 1 interface, add only the numbers which are required for the
setting of auto generation.
• When the prefix information (Excluding indefinite period) is received after the expiry of 365 days validity, it
is operated as valid period of 365 days.
• When the prefix length of prefix information is other than 64, the prefix information is destroyed.
• When onlink flag and auto address generation flag of prefix information is set, the IPv6 address is set to
interface.
Auto Settings of Default Route by Router Advertisement Message Reception
When Router Advertisement Message is received, default route is set which assumes the link local address of
transmission router as broadcast gateway.
When Router Advertisement Message is received by multiple routers, the default router list which can be used
as default router is generated, in this list, the router which can reach the packet is set as default router. The
generated default router list can be referred by show ipv6 ra default-router-list command. Moreover, the set
default router can be referred by show ipv6 route command.
Points to be noted
• When Router Advertisement Message is received from multiple routers, priority control is not operated by
router preference. In this case, the first received router is considered as default router.
• The priority value of default route by Router Advertisement Message is set by 12.
When operated along with default route of static, change the priority value of static route.
Auto Settings of ND information by Router Advertisement Message Reception
In the Router Advertisement Message, adjacent information (ND information) used at the time of
communication is included. When the ND information included in received message and ND information
saved in this device differs after receiving the Router Advertisement Message, the ND information is updated.
The ND information saved in this device and its initial value are shown below.
Valid period (Default is 30 seconds) for reachability of adjacent device
•
Transmission interval (Default is 1 second) of Neighbor Solicitation（NS）Message which confirms the
•
reachabilty of adjacent device
Number of maximum hop (Default is 64)
•
MTU length (Default is 1500 bytes) recommended on received network
•
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