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Configuration Guide - IP Service
S1720, S2700, S5700, and S6720 V200R011C10

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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Configuring the Switch to Discard IP Packets Matching No Routing Entry

Configuring the Switch to Discard IP Packets Matching No Routing Entry


If the switch receives an IP packet that matches no routing entry in the local routing table, it sends the packet to the CPU. If a lot of IP packets match no routing entry because of an attack or incorrect network configuration, the CPU is busy. To prevent this problem, configure the switch to discard these packets.


  1. Run system-view

    The system view is displayed.

  2. Run ipv4 destination-unreachable drop

    The switch is configured to discard IP packets that match no routing entry.

    By default, the function of discarding IP packets that match no routing entry is enabled.

    Only the S5720SI, S5720S-SI, S5720EI, S5720HI, S5730SI, S5730S-EI, S6720LI, S6720S-LI, S6720SI, S6720S-SI, S6720EI, and S6720S-EI support this command.

Updated: 2020-02-26

Document ID: EDOC1000178170

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