H3C Technologies H3C S10500 Series Switches - Manual (Page 125)

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Configuring the maximum number of neighbors dynamically
learned
The device can dynamically acquire the link-layer address of a neighboring node through NS and NA
messages and add it into the neighbor table. A large table can 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
By default, a Layer 2 interface does
not limit the number of neighbors
dynamically learned, and a Layer
3 interface can learn up to 2048
neighbors dynamically.
Setting the age timer for ND entries in stale state
ND entries in stale state have an age timer. If an ND entry in stale state is not refreshed before the timer
expires, it transits to the delay state. If it is still not refreshed in five seconds, the ND entry transits to the
probe state, and the device sends an NS message for detection. If no response is received, the device
removes the ND entry.
Follow these steps to set the age timer for ND entries in stale state:
To do… Use the command… Remarks
Enter system view system-view —
Set the age timer for ND entries
in stale state
ipv6 neighbor stale-aging aging-time
Optional
Four hours 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 10 lists and describes the configurable parameters in an RA
message.
Table 10 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 Hop Limit field in IPv6
headers. The value is also filled into the Hop Limit field in the response packet of a
device.