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Configuration Guide - IP Service

S2720, S5700, and S6720 V200R013C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.
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Disabling a Device from Sending ND Miss Messages

Disabling a Device from Sending ND Miss Messages

Context

If a user sends an IPv6 packet with an irresolvable destination IPv6 address to the device (that is, if the device has a route to the destination IPv6 address of the IPv6 packet but has no ND entry matching the next hop of the route), the device generates an ND Miss message. By default, the device sends the ND Miss messages to the CPU. This improves the efficiency of processing the ND Miss messages.

When the ND Miss message sending function is enabled, a device cannot reply to ICMPv6 host unreachable packets. To enable the device to reply to ICMPv6 host unreachable packets, you can disable the ND Miss message sending function.

NOTE:

Only the S5720HI, S5730HI, and S6720HI support this function.

Procedure

  • Disable a device from sending ND Miss messages

    1. Run system-view

      The system view is displayed.

    2. Run nd-miss message-cache disable

      The ND Miss message sending function is disabled.

      By default, the ND Miss message sending function is enabled.

Verifying the Configuration

Run the display current-configuration | include nd-miss message-cache command to check the configuration of the ND Miss message sending function.

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Updated: 2019-04-20

Document ID: EDOC1100065678

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