HP 6200YL - Manual (Page 89)

IPv6 Addressing Configuration
Duplicate Address Detection (DAD)
Syntax: ipv6 nd ns-interval < milliseconds >
Used on VLAN interfaces to reconfigure the neighbor discovery
time in milliseconds between DAD neighbor solicitations sent
for an unresolved destination, or between duplicate address
detection neighbor solicitation requests. Increasing this
setting is indicated where neighbor solicitation retries or
failures are occurring, or in a “slow” (WAN) network .
To view the current setting, use show ipv6 nd.
Range: 1000 - 3600000 ms; Default: 1000 ms.
Syntax: ipv6 nd reachable-time < milliseconds >
Used on VLAN interfaces to configure the length of time in
milliseconds a neighbor will be considered reachable after the
Neighbor Unreachability Detection algorithm has confirmed
it to be reachable. When the switch operates in host mode, this
setting can be overridden by a reachable time received in a
router advertisement.
To view the current setting, use show ipv6 nd.
Range: 1000 - 2147483647 ms; Default: 30000 ms.
Operating Notes for Neighbor Discovery
■ A verified link-local unicast address must exist on a VLAN interface before
the switch can run DAD on other addresses associated with the interface.
■ If a previously configured unicast address is changed, a neighbor adver­
tisement (an all-nodes multicast message--ff02::1) is sent to notify other
devices on the VLAN and to perform duplicate address detection.
■ IPv6 addresses on a VLAN interface are assigned to multicast address
groups identified with well- known prefixes. For more on this topic, refer
to “Multicast Application to IPv6 Addressing” on page 3-19.
■ DAD is performed on all stateful, stateless, and statically configured
unicast addresses.
■ Neighbor solicitations for DAD do not cause the neighbor cache of
neighboring switches to be updated.
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