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Configuring Neighbor Detection Protocol and Static Entries
IPv6 Neighbor Discovery Protocol supersedes IPv4 Address Resolution Protocol in
IPv6 networks. IPv6 nodes on the same network segment use Neighbor Discovery
to discover each other's presence, to determine each other's link-layer addresses, to
find routers and to maintain reachability information about the paths to active
neighbors. The key parameters used to facilitate this process are the number of
attempts made to verify whether or not a duplicate address exists on the same
network segment, and the interval between neighbor solicitations used to verify
reachability information.
Command Attributes
Protocol Settings
• VLAN – VLAN ID (Range: 1-4093)
• IPv6 ND DAD Attempts – The number of consecutive neighbor solicitation
messages sent on an interface during duplicate address detection. (Range: 0-600,
Default: 1)
- 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 (see “Creating VLANs” on page 11-6). 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.
•
IPv6 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.
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Setting the Switch’s IP Address (IP Version 6)
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