H3C S3100-52P Operation Manual page 473

Operation Manual – ARP
H3C S3100-52P Ethernet Switch
As for an ARP request, all the fields except the hardware address of the receiver
field are set. The hardware address of the receiver is what the sender requests for.
As for an ARP reply, all the fields are set.
Length of hardware address Length of protocol address Length of hardware address Length of protocol address
Figure 1-1 ARP message format
Table 1-1
Table 1-1 Description on the fields of an ARP packet
Hardware Type
Protocol type
Length of hardware address
Length of protocol address
Operator
Hardware address of the sender
IP address of the sender
Hardware address of the
receiver
IP address of the receiver
Hardware type (16 bits) Hardware type (16 bits) Hardware type (16 bits)
Protocol type (16 bits) Protocol type (16 bits)
Operator (16 bits) Operator (16 bits)
Hardware address of the sender Hardware address of the sender
IP address of the sender IP address of the sender
Hardware address of the receiver Hardware address of the receiver
IP address of the receiver IP address of the receiver
describes the fields of an ARP packet.
Field Description
Type of the hardware interface. Refer to
1-2 for the information about the field values.
Type of protocol address to be mapped. 0x0800
indicates an IP address.
Hardware address length (in bytes)
Protocol address length (in bytes)
Indicates the type of a data packets, which can
be:
1: ARP request packets
2: ARP reply packets
3: RARP request packets
4: RARP reply packets
Hardware address of the sender
IP address of the sender
For an ARP request packet, this field is null.
For an ARP reply packet, this field carries the
hardware address of the receiver.
IP address of the receiver
1-2
Chapter 1 ARP Configuration
Table