Concept Guide

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.
Examples of viewing the ARP inspection-limit information
DellEMC# show running-config interface gigabitethernet 1/1
interface GigabitEthernet 1/1
no ip address
switchport
arp inspection-limit rate 15 interval 1
no shutdown
DellEMC#
Bypassing the ARP Inspection
You can congure a port to skip ARP inspection by dening the interface as trusted, which is useful in multi-switch environments.
ARPs received on trusted ports bypass validation against the binding table. All ports are untrusted by default.
To bypass the ARP inspection, use the following command.
• Specify an interface as trusted so that ARPs are not validated against the binding table.
INTERFACE mode
arp inspection-trust
Dynamic ARP inspection is supported on Layer 2 and Layer 3.
Source Address Validation
Using the DHCP binding table, Dell EMC Networking OS can perform three types of source address validation (SAV).
Table 17. Three Types of Source Address Validation
Source Address Validation Description
IP Source Address Validation Prevents IP spoong by forwarding only IP packets that have been
validated against the DHCP binding table.
DHCP MAC Source Address Validation Veries a DHCP packet’s source hardware address matches the
client hardware address eld (CHADDR) in the payload.
IP+MAC Source Address Validation Veries that the IP source address and MAC source address are a
legitimate pair.
Enabling IP Source Address Validation
IP source address validation (SAV) prevents IP spoong by forwarding only IP packets that have been validated against the DHCP binding
table.
A spoofed IP packet is one in which the IP source address is strategically chosen to disguise the attacker. For example, using ARP spoong,
an attacker can assume a legitimate client’s identity and receive trac addressed to it. Then the attacker can spoof the client’s IP address
to interact with other clients.
Dynamic Host
Conguration Protocol (DHCP) 287