HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 100

Setting the age timer for ND entries in stale state, Configuring parameters related to RA messages

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Step 3. Configure the maximum number of neighbors dynamically learned by an interface. Command ipv6 neighbors max-learning-num number Remarks 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. To set the age timer for ND entries in stale state: Step 1. Enter system view. 2. Set the age timer for ND entries in stale state. Command system-view ipv6 neighbor stale-aging aging-time Remarks N/A 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 8 lists and describes the configurable parameters in an RA message. The maximum interval for sending RA messages should be less than (or equal to) the router lifetime in RA messages, so the router can be updated through an RA message before expiration. The values of the NS retransmission timer and the reachable time configured for an interface are sent to hosts via RA messages. Furthermore, this interface sends NS messages at the interval of the NS retransmission timer and considers a neighbor reachable within the reachable time. Table 8 Parameters in an RA message and their descriptions Parameters Cur Hop Limit Prefix Information options MTU Description 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. After receiving the prefix information, the hosts on the same link can perform stateless autoconfiguration. Make sure that all nodes on a link use the same MTU value. 92

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92
Step
Command
Remarks
3.
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.
To set the age timer for ND entries in stale state:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
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 8
lists and describes the configurable parameters in an RA
message.
The maximum interval for sending RA messages should be less than (or equal to) the router lifetime in RA
messages, so the router can be updated through an RA message before expiration.
The values of the NS retransmission timer and the reachable time configured for an interface are sent to
hosts via RA messages. Furthermore, this interface sends NS messages at the interval of the NS
retransmission timer and considers a neighbor reachable within the reachable time.
Table 8
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.
Prefix Information
options
After receiving the prefix information, the hosts on the same link can perform
stateless autoconfiguration.
MTU
Make sure that all nodes on a link use the same MTU value.