H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 397)

39-2
Figure 40-1 ARP message format
Hardware type (16 bits)
Protocol type (16 bits)
Length of hardware address Length of protocol address
Operator (16 bits)
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)
Protocol type (16 bits)
Length of hardware address Length of protocol address
Operator (16 bits)
Hardware address of the sender
IP address of the sender
Hardware address of the receiver
IP address of the receiver
Table 40-1 describes the fields of an ARP packet.
Table 40-1 Description on the fields of an ARP packet
Field Description
Hardware Type
Type of the hardware interface. Refer to Table 40-2 for the
information about the field values.
Protocol type
Type of protocol address to be mapped. 0x0800 indicates an IP
address.
Length of hardware address Hardware address length (in bytes)
Length of protocol address Protocol address length (in bytes)
Operator
Indicates the type of a data packets, which can be:
z
1: ARP request packets
z 2: ARP reply packets
z
3: RARP request packets
z
4: RARP reply packets
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
z
For an ARP request packet, this field is null.
z
For an ARP reply packet, this field carries the hardware address
of the receiver.
IP address of the receiver IP address of the receiver
Table 40-2 Description on the values of the hardware type field
Value Description
1 Ethernet
2 Experimental Ethernet
3 X.25
4 Proteon ProNET (Token Ring)