H3C Technologies H3C S3100 Series Switches - Manual (Page 370)

Operation Manual – ARP
H3C S3100-52P Ethernet Switch Chapter 1 ARP Configuration
1-3
1.1.3 ARP Table
In an Ethernet, the MAC addresses of two hosts must be available for the two hosts to
communicate with each other. Each host in an Ethernet maintains an ARP mapping
table, where the latest used IP address-to-MAC address mapping entries are stored.
Note that this manual only introduces the basic implementation of the mapping table.
Different products of different manufactures may provide more information about the
mapping table. S3100-52P Ethernet switches provide the display arp command to
display the information about ARP mapping entries. Figure 1-2 shows the structure of
an ARP mapping table.
Entry n
…
Entry 5
Entry 4
Entry 3
Entry 2
Entry 1
IP ad Physical address IF index Type dress
Figure 1-2
An ARP mapping table
Table 1-3 describes the APR mapping table fields.
Table 1-3
Description on the fields of an ARP table
Field Description
IF index
Index of the physical interface/port on the device owning
the physical address and IP address contained in the
entry
Physical address Physical address of the device, that is, the MAC address
IP address IP address of the device
Type
Entry type, which can be:
z
1: An entry falling out of the following three cases
z
2: Invalid entry
z
3: Dynamic entry
z
4: Static entry