The 802.3 Header is defined by IEEE and consists of:
–Destination (MAC) address (6 octets)
–Source (MAC) address (6 octets)
–Enet Type (2 octets)
SIZE-14
The 802.2 Header is defined by IEEE and consists of:
–Destinations SAP (1 octet)
–Source SAP (1 octet)
–Type (1 octet)
–Protocol ID (3 octets)
0xAA (SNAP)
0xAA (SNAP)
0x03 (UI)
0x08008F (3Com)
The 3Com Protocol Header is defined by 3Com and consists of:
–Protocol ID (2 octets
0x81b1 (RCP)
For Remote Character Protocol
or
0x81b2 (RTAG)
0x81b2 (RTAG)
For Tag Resolution
As stated earlier, tag resolution is initiated to resolve a 3Com name to a network address. This occurs when the name is used in the REMOTE_LOGIN and the PING commands.
Troubleshooting 4 - 9
