HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 91

IPv6 neighbor discovery protocol, Address resolution

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• 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." • On an interface of another type The EUI-64 address-based interface identifier is generated randomly by the device. IPv6 neighbor discovery protocol The IPv6 Neighbor Discovery (ND) protocol uses five types of ICMPv6 messages to implement the following functions: • Address resolution • Neighbor reachability detection • Duplicate address detection • Router/prefix discovery and address autoconfiguration • Redirection Table 7 ICMPv6 messages used by ND ICMPv6 message Neighbor Solicitation (NS) message Neighbor Advertisement (NA) message Router Solicitation (RS) message Router Advertisement (RA) message Redirect message Type 135 136 133 134 137 Function Acquires the link-layer address of a neighbor. Verifies whether a neighbor is reachable. Detects duplicate addresses. Responds to an NS message. Notifies the neighboring nodes of link layer changes. Requests an address prefix and other configuration information for autoconfiguration after startup. Responds to an RS message. Advertises information such as the Prefix Information options and flag bits. Informs the source host of a better next hop on the path to a particular destination when certain conditions are satisfied. Address resolution This function is similar to the ARP function in IPv4. An IPv6 node acquires the link-layer addresses of neighboring nodes on the same link through NS and NA message exchanges. Figure 45 shows how Host A acquires the link-layer address of Host B on a single link. 83

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83
•
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
."
•
On an interface of another type
The EUI-64 address-based interface identifier is generated randomly by the device.
IPv6 neighbor discovery protocol
The IPv6 Neighbor Discovery (ND) protocol uses five types of ICMPv6 messages to implement the
following functions:
•
Address resolution
•
Neighbor reachability detection
•
Duplicate address detection
•
Router/prefix discovery and address autoconfiguration
•
Redirection
Table 7
ICMPv6 messages used by ND
ICMPv6 message
Type
Function
Neighbor Solicitation (NS)
message
135
Acquires the link-layer address of a neighbor.
Verifies whether a neighbor is reachable.
Detects duplicate addresses.
Neighbor Advertisement
(NA) message
136
Responds to an NS message.
Notifies the neighboring nodes of link layer changes.
Router Solicitation (RS)
message
133
Requests an address prefix and other configuration information for
autoconfiguration after startup.
Router Advertisement (RA)
message
134
Responds to an RS message.
Advertises information such as the Prefix Information options and flag
bits.
Redirect message
137
Informs the source host of a better next hop on the path to a particular
destination when certain conditions are satisfied.
Address resolution
This function is similar to the ARP function in IPv4. An IPv6 node acquires the link-layer addresses of
neighboring nodes on the same link through NS and NA message exchanges.
Figure 45
shows how
Host A acquires the link-layer address of Host B on a single link.