Dell PowerSwitch S4128F-ON EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 223
Bypass Dynamic ARP Inspection on an interface, Enable Dynamic ARP Inspection violation logging
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You can configure the system to log DAI validation failures corresponding to ARP packets. DAI violations are logged at the console if it is enabled. DAI violation logging is disabled by default. If you configure an interface as trusted, the switch interprets ARP packets that ingress the interface from hosts as legitimate packets. By default, all interfaces are in DAI untrusted state. For DAI to work, enable the DHCP snooping feature on the switch. DAI is disabled by default. DAI statistics The system maintains DAI statistics that contain the following details: ● Valid ARP requests ● Invalid ARP requests ● Valid ARP replies ● Invalid ARP replies You can clear the DAI statistics using the clear ip arp inspection statistics command. DAI trusted interfaces By default, all ports are untrusted and all packets go through the DAI validation process on all DAI-enabled VLANs. You can configure an interface to bypass ARP inspection by configuring the interface as trusted. NOTE: Dell EMC Networking recommends configuring the arp inspection-trust command on the DHCP snooping trusted interfaces when DAI is enabled for a VLAN. Restrictions for Dynamic ARP Inspection ● Dynamic ARP Inspection with VxLAN bridges is not supported. ● Maximum number of recommended Dynamic ARP Inspection entries is 2000. Enable Dynamic ARP Inspection ● Enable DHCP snooping. For more information about configuring DHCP snooping, see DHCP snooping. ● Enable Dynamic ARP Inspection on a VLAN in INTERFACE VLAN mode. arp inspection Enable Dynamic ARP Inspection violation logging ● Use the following command in CONFIGURATION mode: arp inspection violation logging Bypass Dynamic ARP Inspection on an interface ● Use the following command in INTERFACE mode: arp inspection-trust Clear DAI statistics ● Clear DAI statistics in EXEC mode. clear ip arp inspection statistics [vlan vlan-name] View DAI database ● View DAI database in EXEC mode show ip arp inspection database [vlan vlan-name] Use the vlan option to view DAI database for a specific VLAN. Example for viewing DAI database OS10# show ip arp inspection database Number of entries : 828 Address Hardware Address Interface VLAN System management 223
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