ipv6 nd prefix-advertisement
Configures the prefixes to be included in router advertisement messages.
Syntax
ipv6 nd prefix-advertisement
ipv6-address
valid-lifetime
preffered-lifetime
[
auto-config
]
[
onlink
]
no ipv6 nd prefix-advertisement
ipv6-address
valid-lifetime
preffered-lifetime
[
auto-config
]
[
onlink
]
Command Default
By default, router advertisement messages include prefixes configured as addresses
on router interfaces using the ipv6 address command.
Parameters
- ipv6-address
- Specifies the IPv6 addres in hexadecimal using 16-bit values between colons as documented in RFC 2373 along with the prefix length in the format X:X::X:X/M.
- valid-lifetime
- Configures the time interval (in seconds) in which the specified prefix is advertised as valid. Valid values are 0 through 4294967295 seconds. The default is 2592000 seconds (30 days). When the timer expires, the prefix is no longer considered to be valid.
- preffered-lifetime
- Configures the time interval (in seconds) in which the specified prefix isadvertised as preferred. Valid values are 0 through 4294967295 seconds. The default is 604800 seconds (7 days). When the timer expires, the prefix is no longer considered to be preferred.
- auto-config
- If this flag is set, the stateless auto configuration feature can use the specified prefix in the automatic configuration of 128-bit IPv6 addresses for hosts on the local link, provided the specified prefix is aggregatable, as specified in RFC 2374.
Modes
Interface configuration mode
Usage Guidelines
The
no form of the command removes a prefix from the router advertisement messages sent
from a particular interface.
Examples
The following example configures to advertise the prefix 2001:DB8:a487:7365::/64 in router advertisement messages sent out on Ethernet interface 1/3/1 with a valid lifetime of 1000 seconds, a preferred lifetime of 800 seconds, and the Onlink and Autoconfig flags set.
device(config)# interface ethernet 1/3/1 device(config-if-e1000-1/3/1)# ipv6 nd prefix-advertisement 2001:DB8:a487:7365::/64 1000 800 onlink autoconfig