R21xx-HP FlexFabric 11900 Layer 3 IP Services Configuration Guide

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Figure 53 Converting a MAC address into an EUI-64 address-based interface identifier
• 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 "Configuring tunneling."
• O
n an interface of another type—The EUI-64 address-based interface identifier is generated
randomly by the device.
IPv6 ND protocol
The IPv6 Neighbor Discovery (ND) protocol uses the following ICMPv6 messages:
Table 8 ICMPv6 messages used by ND
ICMPv6 messa
g
e T
yp
e Function
Neighbor Solicitation (NS) 135
Acquires the link-layer address of a neighbor.
Verifies whether a neighbor is reachable.
Detects duplicate addresses.
Neighbor Advertisement
(NA)
136
Responds to an NS message.
Notifies the neighboring nodes of link layer changes.
Router Solicitation (RS) 133
Requests an address prefix and other configuration information
for autoconfiguration after startup.
Router Advertisement (RA) 134
Responds to an RS message.
Advertises information, such as the Prefix Information options
and flag bits.
Redirect 137
Informs the source host of a better next hop on the path to a
particular destination when certain conditions are met.
Address resolution
This function is similar to ARP in IPv4. An IPv6 node acquires the link-layer addresses of neighboring
nodes on the same link through NS and NA messages. Figure 54
shows how Host A acquires the
link-layer address of Host B on the same link.