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CLI-based Configuration Guide - Security

AR500, AR510, and AR530 V200R007

This document describes the configurations of Security, including AAA, DAA,NAC, BRAS Access, ACL, Firewall, Deep Security Defense, Local Attack Defense;Attack Defense, Traffic Suppression, ARP Security, Port Security, DHCP Snooping, IPSG, URPF, PKI, SSL, HTTPS, Keychain, separating the management plane from the service plane, security risks.
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Basic Principles

Basic Principles

DHCP snooping supports the listening function to record mappings between IP addresses and MAC (Media Access Control) addresses of DHCP clients.

After DHCP snooping is enabled, the device generates a DHCP snooping binding table by listening to DHCP Request messages and Reply messages. A binding entry contains the MAC address, IP address, interface number, and Virtual Location Area Network (VLAN) ID of the DHCP client.

The DHCP snooping binding entries are aged out when the DHCP release expires, or the entries are deleted when users send DHCP Release packets to release IP addresses.

The administrator needs to record IP addresses of DHCP clients and identify the mappings between the IP addresses and MAC addresses of the DHCP clients. The DHCP snooping binding table helps the administrator conveniently record the mappings.


The DHCP snooping binding table records the mapping between IP addresses and MAC addresses of DHCP clients. The device can check DHCP messages against the DHCP snooping binding table to prevent bogus DHCP message attacks.

Updated: 2019-05-25

Document ID: EDOC1000097287

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