Planet Networking & Communication SGS-5240 Series User Manual page 182

◆Enable IPv6 Explicitly – Enables IPv6 on an interface. Note that when an explicit address is assigned to an interface, IPv6 is
automatically enabled, and cannot be disabled until all assigned addresses have been removed. (Default: Disabled) Disabling
this parameter does not disable IPv6 for an interface that has been explicitly configured with an IPv6 address.
◆MTU – Sets the size of the maximum transmission unit (MTU) for IPv6 packets sent on an interface. (Range: 1280-65535
bytes; Default: 1500 bytes)

The maximum value set in this field cannot exceed the MTU of the physical interface, which is currently fixed at
1500 bytes.

IPv6 routers do not fragment IPv6 packets forwarded from other routers. However, traffic originating from an
end-station connected to an IPv6 router may be fragmented.

All devices on the same physical medium must use the same MTU in order to operate correctly.

IPv6 must be enabled on an interface before the MTU can be set. If an IPv6 address has not been assigned to the
switch, "N/A" is displayed in the MTU field.
◆ND DAD Attempts – The number of consecutive neighbor solicitation messages sent on an interface during duplicate
address detection. (Range: 0-600, Default: 3)

Configuring a value of 0 disables duplicate address detection.

Duplicate address detection determines if a new unicast IPv6 address already exists on the network before it is
assigned to an interface.

Duplicate address detection is stopped on any interface that has been suspended. While an interface is suspended,
all unicast IPv6 addresses assigned to that interface are placed in a "pending" state. Duplicate address detection is
automatically restarted when the interface is administratively re-activated.

An interface that is re-activated restarts duplicate address detection for all unicast IPv6 addresses on the interface.
While duplicate address detection is performed on the interface's link-local address, the other IPv6 addresses
remain in a "tentative" state. If no duplicate link-local address is found, duplicate address detection is started for the
remaining IPv6 addresses.

If a duplicate address is detected, it is set to "duplicate" state, and a warning message is sent to the console. If a
duplicate link-local address is detected, IPv6 processes are disabled on the interface. If a duplicate global unicast
address is detected, it is not used. All configuration commands associated with a duplicate address remain
configured while the address is in "duplicate" state.

If the link-local address for an interface is changed, duplicate address detection is performed on the new link-local
address, but not for any of the IPv6 global unicast addresses already associated with the interface.
◆ND NS Interval – The interval between transmitting IPv6 neighbor solicitation messages on an interface. (Range:
1000-3600000 milliseconds; Default: 1000 milliseconds is used for neighbor discovery operations, 0 milliseconds is advertised
in router advertisements. This attribute specifies the interval between transmitting neighbor solicitation messages when
resolving an address, or when probing the reachability of a neighbor. Therefore, avoid using very short intervals for normal IPv6
operations.
◆ND Reachable-Time – The amount of time that a remote IPv6 node is considered reachable after some reachability
confirmation event has occurred. (Range: 0-3600000 milliseconds; Default: 30000 milliseconds)
User's Manual of SGS-5240 Series Managed Switch
182