15-6
Figure 15-2
Convert a MAC address into an EUI-64 address-based interface identifier
z
On a tunnel interface
The lower 32 bits of the EUI-64 address-based interface identifier are the source IPv4 address
of the tunnel interface. The higher 32 bits of the EUI-64 address-based interface identifier of an
ISATAP tunnel interface are 0000:5EFE, whereas those of other tunnel interfaces are all zeros.
For more information about tunnels,
see Tunneling Configuration in the Layer 3 - IP Services
Configuration Guide
.
z
On an interface of another type (such as a serial interface)
The EUI-64 address-based interface identifier is generated randomly by the device.
IPv6 Neighbor Discovery Protocol
The IPv6 Neighbor Discovery Protocol (NDP) uses five types of ICMPv6 messages to
implement the following functions:
z
z
Neighbor reachability detection
z
z
Router/prefix discovery and address autoconfiguration
lists the types and functions of ICMPv6 messages used by the NDP.
Table 15-3
Types and functions of ICMPv6 messages
ICMPv6 message
Type
Function
Acquires the link-layer address of a neighbor.
Verifies that a neighbor is reachable.
Neighbor Solicitation (NS)
message
135
Deletes duplicate addresses.
Responds to an NS message.
Neighbor Advertisement
(NA) message
136
Notifies the neighboring nodes of link layer changes.
Router Solicitation (RS)
message
133
Requests for an address prefix and other configuration
information for autoconfiguration after startup.
