Chapter 1 Arp Configuration; Introduction To Arp; Arp Function; Arp Message Format - H3C S3100-52P Operation Manual

Operation Manual – ARP
H3C S3100-52P Ethernet Switch

Chapter 1 ARP Configuration

When configuring ARP, go to these sections for information you are interested in:

Introduction to ARP

Configuring ARP
Configuring Gratuitous ARP
Displaying and Debugging ARP
ARP Configuration Examples
Note:
The ARP attack detection feature is added to this manual. For details, refer to
section
The ARP packet rate limit feature is added to the manual. For details, refer to
section
1.1 Introduction to ARP

1.1.1 ARP Function

Address Resolution Protocol (ARP) is used to resolve an IP address into a data link
layer address.
An IP address is the address of a host at the network layer. To send a network layer
packet to a destination host, the device must know the data link layer address (MAC
address, for example) of the destination host or the next hop. To this end, the IP
address must be resolved into the corresponding data link layer address.
Note:
Unless otherwise stated, a data link layer address in this chapter refers to a 48-bit
Ethernet MAC address.

1.1.2 ARP Message Format

ARP messages are classified as ARP request messages and ARP reply messages.
Figure 1-1
Introduction to ARP Attack
Introduction to ARP Packet Rate
illustrates the format of these two types of ARP messages.
Detection.
Limit.
1-1
Chapter 1 ARP Configuration