Web Management Guide-R02

Chapter 16 | IP Configuration
Setting the Switch’s IP Address (IP Version 6)
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with a duplicate address remain configured while the address is in
“duplicate” state.
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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.
When a non-default value is configured, the specified interval is used both for
router advertisements and by the router itself.
◆ 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 is used for neighbor discovery operations,
0 milliseconds is advertised in router advertisements.
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The time limit configured by this parameter allows the router to detect
unavailable neighbors. During the neighbor discover process, an IPv6 node
will multicast neighbor solicitation messages to search for neighbor nodes.
For a neighbor node to be considered reachable, it must respond to the
neighbor soliciting node with a neighbor advertisement message to
become a confirmed neighbor, after which the reachable timer will be
considered in effect for subsequent unicast IPv6 layer communications.
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This time limit is included in all router advertisements sent out through an
interface, ensuring that nodes on the same link use the same time value.
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Setting the time limit to 0 means that the configured time is unspecified by
this router.
RA Guard Mode
◆ Interface – Shows port or trunk configuration page.
◆ RA Guard – Blocks incoming Router Advertisement and Router Redirect
packets. (Default: Disabled)
IPv6 Router Advertisements (RA) convey information that enables nodes to
auto-configure on the network. This information may include the default router
address taken from the observed source address of the RA message, as well as
on-link prefix information. However, note that unintended misconfigurations,
or possibly malicious attacks on the network, may lead to bogus RAs being
sent, which in turn can cause operational problems for hosts on the network.