H3C SOHO IE4300, Command Reference Manual

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ipv6 nd ra dns search-list
Use
ipv6 nd ra dns search-list
to specify DNS suffix information to be advertised in RA
messages.
Use
undo ipv6 nd ra dns search-list
to remove a DNS suffix from RA message
advertisement.
Syntax
ipv6 nd ra dns search-list domain-name [ seconds | infinite ] sequence
seqno
undo ipv6 nd ra dns search-list domain-name
Default
DNS suffix information is not specified and RA messages do not carry DNS suffix options.
Views
Interface view
Predefined user roles
network-admin
Parameters
domain-name
: Specifies a DNS suffix. It is a dot-separated, case-insensitive string that can
include letters, digits, hyphens (-), underscores (_), and dots (.), for example, aabbcc.com. The
DNS suffix can include a maximum of 253 characters, and each separated string includes no more
than 63 characters.
seconds
: Specifies the lifetime of the DNS suffix, in seconds. The value range is 4 to 4294967295.
Value 4294967295 indicates that the lifetime of the DNS suffix is infinite.
infinite
: Sets the lifetime of the DNS suffix to infinite.
seqno
: Specifies the sequence number of the DNS suffix, in the range of 0 to 4294967295. The
sequence number for a DNS suffix must be unique. A smaller sequence number represents a
higher priority.
Usage guidelines
The DNS search list (DNSSL) option in RA messages provides DNS suffix information for hosts.
The RA messages allow hosts to obtain their IPv6 addresses and the DNS suffix through stateless
autoconfiguration. This method is useful in a network where DHCPv6 infrastructure is not provided.
The default lifetime of the DNS suffix is three times the maximum interval for advertising RA
messages. To set the maximum interval, use the
ipv6 nd ra interval
command.
You can configure a maximum of eight DNS suffixes on an interface. One DNSSL option contains
one DNS suffix. All DNSSL options are sorted in ascending order of the sequence number of the
DNS suffix.
The sequence number uniquely identifies a DNS suffix. To modify a DNS suffix or its sequence
number, you must first use the
undo ipv6 nd ra dns search-list command to remove the
DNS suffix from RA message advertisement.
After you execute the ipv6 nd ra dns search-list command, the device immediately sends
an RA message with the existing and newly specified DNS suffix information.
After you execute the
undo ipv6 nd ra dns search-list
command, the device immediately
sends two RA messages.
•
The first RA message carries information about all DNS suffixes, including DNS suffixes
specified in the
undo
command with their lifetime set to 0 seconds.