510 CHAPTER 38: IPV6 BASICS CONFIGURATION
■ You need to execute the ipv6 address auto link-local command before the
undo ipv6 address auto link-local command. However, if an IPv6 site-local
address or aggregatable global unicast address is already configured for an
interface, the interface still has a link-local address because the system
automatically generates one for the interface. If no IPv6 site-local address or
aggregatable global unicast address is configured, the interface has no
link-local address.
Configuring IPv6 NDP
Configuring a Static
Neighbor Entry
The IPv6 address of a neighbor node can be resolved into a link-layer address
dynamically through NS and NA messages or through a manually configured
neighbor entry.
The device uniquely identifies a static neighbor entry according to the IPv6 address
and the layer 3 interface ID. Currently, there are two configuration methods:
■ Configure an IPv6 address and link-layer address for a Layer 3 interface.
■ Configure an IPv6 address and link-layer address for a port in a VLAN.
Follow these steps to configure a static neighbor entry:
c
CAUTION: You can adopt either of the two methods above to configure a static
neighbor entry for a VLAN interface.
■ After a static neighbor entry is configured by using the first method, the device
needs to resolve the corresponding Layer 2 port information of the VLAN
interface.
■ If you adopt the second method to configure a static neighbor entry, you
should ensure that the corresponding VLAN interface exists and that the layer 2
port specified by port-type port-number belongs to the VLAN specified by
vlan-id. After a static neighbor entry is configured, the device relates the VLAN
interface to an IPv6 address to uniquely identify a static neighbor entry.
Configuring the
Maximum Number of
Neighbors Dynamically
Learned
The device can dynamically acquire the link-layer address of a neighbor node and
add it into the neighbor table through NS and NA messages. Too large a neighbor
table from which neighbor entries can be dynamically acquired may lead to the
forwarding performance degradation of the device. Therefore, you can restrict the
size of the neighbor table by setting the maximum number of neighbors that an
interface can dynamically learn. When the number of dynamically learned
neighbors reaches the threshold, the interface will stop learning neighbor
information.
Follow these steps to configure the maximum number of neighbors dynamically
learned:
To do… Use the command… Remarks
Enter system view system-view -
Configure a static
neighbor entry
ipv6 neighbor ipv6-address mac-address
{ vlan-id port-type port-number | interface
interface-type interface-number }
Required
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