HP 6120XG HP ProCurve Series 6120 Blade Switches IPv6 Configuration Guide - Page 33

Neighbor Discovery (ND) in IPv6, Refer to Default IPv6 Router on and View IPv6 Gateway

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Introduction to IPv6 Configuration and Management Refer to "Default IPv6 Router" on page 4-30 and "View IPv6 Gateway, Route, and Router Neighbors " on page 4-31. Neighbor Discovery (ND) in IPv6 The IPv6 Neighbor Discovery protocol operates in a manner similar to the IPv4 ARP protocol to provide for discovery of IPv6 devices such as other switches, routers, management stations, and servers on the same interface. Neighbor Discovery runs automatically in the default configuration and provides services in addition to those provided in IPv4 by ARP. For example: ■ Run Duplicate Address Detection (DAD) to detect duplicate unicast address assignments on an interface. An address found to be a duplicate is not used, and the show ipv6 command displays the address as a duplicate. ■ Quickly identify routers on an interface by sending router solicitations requesting an immediate router advertisement (RA) from reachable routers. ■ If a default router becomes unreachable, locate an alternate (if available on the interface). ■ Learn from reachable routers on the interface whether to use DHCPv6 or stateless address auto configuration. In the latter case, this also includes the address prefixes to use with stateless address auto configuration for routed destinations. (A DHCPv6 server can also be used for "stateless" service; that is, for configuring the interface for access to other network services, but not configuring a global IPv6 unicast address on the interface. Refer to "Neighbor Discovery (ND)" on page 4-17.) ■ Use multicast neighbor solicitations to learn the link-layer addresses of destinations on the same interface and to verify that neighbors to which traffic is being sent are still reachable. ■ Send a multicast neighbor advertisement in response to a solicitation from another device on the same interface or to notify neighbors of a change in the link- layer address. ■ Advertise anycast addresses that may be configured on the device. ■ Determine the MTU (Maximum Transmission Unit) for the interface from router advertisements. For more on IPv6 neighbor discovery applications, refer to "Neighbor Discovery (ND)" on page 4-17. 2-9

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2-9
Introduction to IPv6
Configuration and Management
Refer to “Default IPv6 Router” on page 4-30 and “View IPv6 Gateway, Route,
and Router Neighbors ” on page 4-31.
Neighbor Discovery (ND) in IPv6
The IPv6 Neighbor Discovery protocol operates in a manner similar to the IPv4
ARP protocol to provide for discovery of IPv6 devices such as other switches,
routers, management stations, and servers on the same interface. Neighbor
Discovery runs automatically in the default configuration and provides
services in addition to those provided in IPv4 by ARP. For example:
■
Run Duplicate Address Detection (DAD) to detect duplicate unicast
address assignments on an interface. An address found to be a duplicate
is not used, and the
show ipv6
command displays the address as a
duplicate
.
■
Quickly identify routers on an interface by sending router solicitations
requesting an immediate router advertisement (RA) from reachable
routers.
■
If a default router becomes unreachable, locate an alternate (if available
on the interface).
■
Learn from reachable routers on the interface whether to use DHCPv6 or
stateless address auto configuration. In the latter case, this also includes
the address prefixes to use with stateless address auto configuration for
routed destinations. (A DHCPv6 server can also be used for “stateless”
service; that is, for configuring the interface for access to other network
services, but not configuring a global IPv6 unicast address on the inter-
face. Refer to “Neighbor Discovery (ND)” on page 4-17.)
■
Use multicast neighbor solicitations to learn the link-layer addresses of
destinations on the same interface and to verify that neighbors to which
traffic is being sent are still reachable.
■
Send a multicast neighbor advertisement in response to a solicitation from
another device on the same interface or to notify neighbors of a change
in the link- layer address.
■
Advertise anycast addresses that may be configured on the device.
■
Determine the MTU (Maximum Transmission Unit) for the interface from
router advertisements.
For more on IPv6 neighbor discovery applications, refer to “Neighbor
Discovery (ND)” on page 4-17.