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11-75
Cisco MDS 9000 Family Command Reference
OL-16217-01, Cisco MDS SAN-OS Release 3.x
Chapter 11 I Commands
ipv6 nd
ipv6 nd
To configure IPv6 neighbor discovery commands on the interface, use the ipv6 nd command in interface
configuration submode. To remove IPv6 neighbor discovery configuration commands, use the no form
of the command.
ipv6 nd {dad attempts number | reachable-time time | retransmission-time time}
no ipv6 nd {dad attempts number | reachable-time time | retransmission-time time}
Syntax Description
Defaults DAD attempts: 0.
Reachable-time: 30000 milliseconds.
Retransmission-time: 1000 milliseconds.
Command Modes Interface configuration submode.
Command History
Usage Guidelines A router must be able to determine the link-local address for each of its neighboring routers in order to
ensure that the target address (the final destination) in a redirect message identifies the neighbor router
by its link-local address. For static routing, the address of the next-hop router should be specified using
the link-local address of the router; for dynamic routing, all IPv6 routing protocols must exchange the
link-local addresses of neighboring routers.
Note A high number of DAD attempts (greater than 2) can delay address assignment.
For complete information about IPv6 neighbor discovery, refer to the Cisco MDS 9000 Family CLI
Configuration Guide.
Examples The following example sets the duplicate address detection attempts count to 2.
switch# config terminal
switch(config)# interface gigabitethernet 2/2
switch(config-if)# ipv6 nd dad attempts 2
dad attempts number Configures duplicate address detection (DAD) attempts. The range is 0 to
15.
reachable-time time Configures reachability time. Specifies the reachability time in
milliseconds. The range is 1000 to 3600000.
retransmission-time
time
Configures the retransmission timer. Specifies the retransmission time in
milliseconds. The range is 1000 to 3600000.
Release Modification
3.0(1) This command was introduced.
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