Reference Guide

IPv6 Commands 697
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DELL CONFIDENTIAL – PRELIMINARY 5/21/14 - FOR PROOF ONLY
The interval between 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
4861, Neighbor Discovery for IPv6), which is used to determine the time
between retransmissions of neighbor solicitation messages to a neighbor
when resolving the address or when probing the reachability of a neighbor.
This is the same management variable used to specify the interval for
neighbor solicitation messages during address resolution and neighbor
unreachability detection. Use the ipv6 nd ns-interval command to configure
the interval between neighbor solicitation messages that are sent during
duplicate address detection.
Duplicate address detection is suspended on interfaces that are
administratively down. While an interface is administratively down, the
Unicast IPv6 addresses assigned to the interface are set to a pending state.
Duplicate address detection is automatically restarted on an interface when
the interface returns to being administratively up.
An interface returning to administratively up, restarts duplicate address
detection for all of the Unicast IPv6 addresses on the interface. While
duplicate address detection is performed on the link-local address of an
interface, the state for the other IPv6 addresses is still set to TENTATIVE.
When duplicate address detection is completed on the link-local address,
duplicate address detection is performed on the remaining IPv6 addresses.
When duplicate address detection identifies a duplicate address, the state of
the address is set to DUPLICATE and the address is not used. If the duplicate
address is the link-local address of the interface, the processing of IPv6
packets is disabled on the interface and an error SYSLOG message is issued.
If the duplicate address is a global address of the interface, the address is not
used and an error SYSLOG message is issued.
All configuration commands associated with the duplicate address remain as
configured while the state of the address is set to DUPLICATE.
If the link-local address for an interface changes, duplicate address detection
is performed on the new link-local address and all of the other IPv6 address
associated with the interface are regenerated (duplicate address detection is
performed only on the new link-local address).
Note. Since DAD is not supported on NBMA interfaces the command is
allowed but does not impact on an IPv6 tunnel interface of the ISATAP type