Administrator Guide

Conguring 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 Gi 1/2 Vl 10 CP
Internet 10.1.1.252 - 00:00:4d:57:e6:f6 Gi 1/1 Vl 10 CP
Internet 10.1.1.253 - 00:00:4d:57:f8:e8 Gi 1/3 Vl 10 CP
Internet 10.1.1.254 - 00:00:4d:69:e8:f2 Gi 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#
Conguring dynamic ARP inspection-limit
To congure dynamic ARP inspection rate limit on a port, perform the following task.
1 Enter into global conguration mode.
EXEC Privilege mode
configure terminal
2 Select the interface to be congured.
CONFIGURATION mode
interface interface-name
3 Congure ARP packet inspection rate limiting.
INTERFACE CONFIGURATION mode
arp inspection-limit {rate pps [interval seconds]}
The rate packet per second (pps) range is from 1 to 2048. The default is 15.
The rate burst interval range is from 1 to 15 seconds. The default is 1.
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Dynamic Host Conguration Protocol (DHCP)