188Minimizing link-local ND entriesPerform this task to minimize link-local ND entries assigned to the driver. Link-local ND entries refer to NDentries comprising link-local addresses.By default, the device assigns all ND entries to the driver. With this feature enabled, the device does notadd newly learned link-local ND entries whose link local addresses are not the next hop of any route intothe 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 Command Remarks1. Enter system view. system-view N/A2. Minimize link-local NDentries.ipv6 neighbor link-localminimizeBy default, the device assigns all ND entriesto the driver.Setting the hop limitPerform 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 valueconfigured by this task in a sent RA message. A host receiving the RA message fills the value intothe Hop Limit field of sent IPv6 packets.To set the hop limit:Step Command Remarks1. Enter system view. system-view N/A2. Set the Hop Limit field in the IP header. ipv6 hop-limit value The default setting is 64.Configuring parameters for RA messagesYou can enable an interface to send RA messages, and configure the interval for sending RA messagesand parameters in RA messages. After receiving an RA message, a host can use these parameters toperform corresponding operations. Table 12 describes the configurable parameters in an RA message.Table 9 Parameters in an RA message and their descriptionsParameter DescriptionHop Limit Maximum number of hops in RA messages. A host receiving the RA message fills thevalue in the Hop Limit field of sent IPv6 packets.Prefix information After receiving the prefix information, the hosts on the same link can performstateless autoconfiguration.MTU Guarantees that all nodes on the link use the same MTU.
