Ipv6 Nd Dad Attempts (Bng) - Cisco ASR 9000 Series Command Reference Manual

ipv6 nd dad attempts (BNG)

ipv6 nd dad attempts (BNG)
To configure the number of consecutive neighbor solicitation messages that are sent on an interface while
duplicate address detection is performed on the unicast IPv6 addresses of the interface, use the ipv6 nd dad
attempts command in an appropriate configuration mode. To return the number of messages to the default
value, use the no form of this command.
ipv6 nd dad attempts value
no ipv6 nd dad attempts value
Syntax Description
value
Command Default
Duplicate address detection on unicast IPv6 addresses with the sending of one neighbor solicitation message
is enabled. The default is one message.
Command Modes
Interface configuration (not applicable for BNG)
Dynamic template configuration (for BNG)
Command History
Release
Release 3.7.2
Release 4.3.0
Usage Guidelines
Duplicate address detection verifies the uniqueness of new unicast IPv6 addresses before the addresses are
assigned to interfaces (the new addresses remain in a tentative state while duplicate address detection is
performed). Duplicate address detection uses neighbor solicitation messages to verify the uniqueness of unicast
IPv6 addresses.
The DupAddrDetectTransmits node configuration variable (as specified in RFC 2462, IPv6 Stateless Address
Autoconfiguration) is used to automatically determine the number of consecutive neighbor solicitation messages
that are sent on an interface while duplicate address detection is performed on a tentative unicast IPv6 address.
The interval between the sending of duplicate address detection neighbor solicitation messages (the duplicate
address detection timeout interval) is specified by the neighbor discovery-related variable RetransTimer (as
specified in RFC 2461, Neighbor Discovery for IP Version 6 [IPv6]), which is used to determine the time
between retransmissions of neighbor solicitation messages to a neighbor when the address is being resolved
or when the reachability of a neighbor is being probed. This is the same management variable used to specify
the interval for neighbor solicitation messages during address resolution and neighbor unreachability detection.
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Command Reference,
Release 5.2.x
354
Number of neighbor solicitation messages. Range is 0 to 600. Configuring a value of 0
disables duplicate address detection processing on the specified interface; a value of 1
configures a single transmission without follow-up transmissions.
Modification
This command was introduced.
This command was supported in the dynamic template configuration
mode for BNG.
Neighbor Discovery Commands