H3C Technologies H3C S7500E Series Switches - Manual (Page 134)

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z 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.
z If you adopt the second method, 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 the
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 through NS and NA
messages and add it into the neighbor table. Too large a neighbor table may reduce the forwarding
performance of the device. 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 —
Enter interface view
interface interface-type
interface-number
—
Configure the maximum number of
neighbors dynamically learned by
an interface
ipv6 neighbors
max-learning-num number
Optional
2048 by default
Configuring Parameters Related to RA Messages
You can enable an interface to send RA messages, and configure the interval for sending RA
messages and parameters in RA messages. After receiving an RA message, a host can use these
parameters to perform corresponding operations. Table 13-4 lists the configurable parameters in an RA
message and their descriptions.
Table 13-4 Parameters in an RA message and their descriptions
Parameters Description
Cur hop limit
When sending an IPv6 packet, a host uses the value to fill the Cur Hop Limit field in
IPv6 headers. The value is also filled into the Cur Hop Limit field in response
messages of a device.
Prefix information
options
After receiving the prefix information advertised by the device, the hosts on the
same link can perform stateless autoconfiguration.