The network-layer address of the device
SNMP-agent as reported in the most recent FDP/CDP message
in the following format:
IP address: 4 octets, ip(1)
IPX address: 10 octets, ipx(2)
First 4-octet as the network number
Second 6-octet as the host number
Appletalk address: 3 octets, appletalk(3)
First 2-octet as the network number
Second 1-octet as the host number