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Usage guidelines
The router lifetime in RA messages specifies how long the router sending the RA messages acts as
the default router. Hosts receiving the RA messages check this value to determine whether to use
the sending router as the default router. If the router lifetime is 0, the router cannot be used as the
default router.
The router lifetime in RA messages must be greater than or equal to the advertising interval.
Examples
# Set the router lifetime in RA messages on VLAN-interface 100 to 1000 seconds.
<Sysname> system-view
[Sysname] interface vlan-interface 100
[Sysname-Vlan-interface100] ipv6 nd ra router-lifetime 1000
Related commands
ipv6 nd ra interval
ipv6 nd router-preference
Use ipv6 nd router-preference to set a router preference in RA messages.
Use undo ipv6 nd router-preference to restore the default.
Syntax
ipv6 nd router-preference { high | low | medium }
undo ipv6 nd router-preference
Default
The router preference is medium.
Views
Interface view
Predefined user roles
network-admin
Parameters
high: Sets the router preference to the highest setting.
low: Sets the router preference to the lowest setting.
medium: Sets the router preference to the medium setting.
Usage guidelines
A hosts selects a router with the highest preference as the default router.
When router preferences are the same in RA messages, a host selects the router corresponding to
the first received RA message as the default gateway.
Examples
# Set the router preference in RA messages to the highest on VLAN-interface 100.
<Sysname> system-view
[Sysname] interface vlan-interface 100
[Sysname-Vlan-interface100] ipv6 nd router-preference high
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