Chapter 1 Arp Configuration; Arp Overview; Arp Function; Arp Message Format - H3C S3610-28P Operation Manual

Operation Manual – ARP
H3C S3610&S5510 Series Ethernet Switches

Chapter 1 ARP Configuration

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

ARP Overview

Configuring ARP
Configuring Gratuitous ARP
Configuring ARP Source Suppression
Displaying and Maintaining ARP
1.1 ARP Overview

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 (such as
the MAC address) of the destination host. To this end, the IP address must be resolved
into the corresponding data link layer address.
Note:
Unless otherwise stated, the data link layer addresses that appear in this chapter refer
to the 48-bit Ethernet MAC addresses.

1.1.2 ARP Message Format

Hardware
type
2
Figure 1-1 ARP message format
Hardware address length
Protocol address length
Protocol OP Sender hardware
type address
1 1 2
2
28-byte ARP request/response
Sender protocol Target hardware
address
6 4
1-1
Chapter 1 ARP Configuration
Target
protocol
address
address
6 4