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Configuration Guide - Security

S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of Security, including ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, Port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, MPAC, separating the management plane from the service plane, security risks, PKI.
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What Is ARP Miss?

What Is ARP Miss?

The device sends an ARP Miss message when the routing table contains the routing entry that maps the destination IP address of an IP packet, but does not contain the ARP entry that maps the next hop of the routing entry.

The IP packet that triggers the ARP Miss message is sent to the CPU for processing. The device generates and delivers a temporary ARP entry based on the ARP Miss message, and sends an ARP Request packet to the destination network.

If a host sends a large number of IP packets with unresolvable destination IP addresses (the device has a route to the destination IP address of a packet but has no ARP entry matching the next hop of the route) to a device, the device sends a large number of ARP Miss messages and many ARP Request packets to the destination network, consuming considerable CPU and bandwidth resources.

Updated: 2019-09-23

Document ID: EDOC1000178177

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