Minimizing Link-Local Nd Entries; Setting The Hop Limit; Configuring Parameters For Ra Messages - H3C MSR 2600 Configuration Manual

Minimizing link-local ND entries

Perform this task to minimize link-local ND entries assigned to the driver. Link-local ND entries refer to ND
entries comprising link-local addresses.
By default, the device assigns all ND entries to the driver. With this feature enabled, the device does not
add newly learned link-local ND entries whose link local addresses are not the next hop of any route into
the driver to save driver resources.
This feature affects only newly learned link-local ND entries rather than existing ND entries.
To minimize link-local ND entries:
Step
Enter system view.
1.
2. Minimize link-local ND
entries.

Setting the hop limit

Perform this task to implement the following functions:
Set the value of the Hop Limit field for IPv6 packets sent by the device.
•
• If you use the undo ipv6 nd ra hop-limit unspecified command, the device sets the hop limit value
configured by this task in a sent RA message. A host receiving the RA message fills the value into
the Hop Limit field of sent IPv6 packets.
To set the hop limit:
Step
1. Enter system view.
2. Set the Hop Limit field in the IP header.

Configuring parameters for 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 9 Parameters in an RA message and their descriptions
Parameter
Hop Limit
Prefix information
MTU
Command
system-view
ipv6 neighbor link-local
minimize
Command
system-view
ipv6 hop-limit value
Table 12 describes the configurable parameters in an RA message.
Description
Maximum number of hops in RA messages. A host receiving the RA message fills the
value in the Hop Limit field of sent IPv6 packets.
After receiving the prefix information, the hosts on the same link can perform
stateless autoconfiguration.
Guarantees that all nodes on the link use the same MTU.
188
Remarks
N/A
By default, the device assigns all ND entries
to the driver.
Remarks
N/A
The default setting is 64.