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Dell Configuration Guide for the S4048–ON System 9.14.2.6

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Configuring Dynamic ARP Inspection

To enable dynamic ARP inspection, use the following commands.

  1. Enable DHCP snooping.
  2. Validate ARP frames against the DHCP snooping binding table.
    INTERFACE VLAN mode
    arp inspection

Examples of Viewing the ARP Information

To view entries in the ARP database, use the show arp inspection database command.

DellEMC#show arp inspection database

Protocol  Address     Age(min) Hardware Address   Interface VLAN   CPU
---------------------------------------------------------------------
Internet  10.1.1.251  -        00:00:4d:57:f2:50  Te 1/2    Vl 10  CP
Internet  10.1.1.252  -        00:00:4d:57:e6:f6  Te 1/1    Vl 10  CP
Internet  10.1.1.253  -        00:00:4d:57:f8:e8  Te 1/3    Vl 10  CP
Internet  10.1.1.254  -        00:00:4d:69:e8:f2  Te 1/5   Vl 10  CP
DellEMC#

To see how many valid and invalid ARP packets have been processed, use the show arp inspection statistics command.

DellEMC#show arp inspection statistics

Dynamic ARP Inspection (DAI) Statistics
---------------------------------------
Valid ARP Requests           : 0
Valid ARP Replies            : 1000
Invalid ARP Requests         : 1000
Invalid ARP Replies          : 0
DellEMC#

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