36APPENDIX B: ADMINISTERING ATM

ATM in Your

ATM architecture differs fundamentally from IEEE 802.x technology. IEEE

Network

802.x LANs, which are limited to FDDI, Ethernet, and token ring, are

 

connectionless and use the Media Access Control (MAC) addresses in

 

each packet to communicate to end-stations. ATM is connection-oriented

 

and uses an circuit identifier, called a virtual channel identifier, to

 

exchange data between two ATM stations over previously established

 

virtual channel connection (VCC).

LAN Emulation

To forward data over an ATM interface in an existing network, two

and Classical IP

methods are provided to adapt existing network layer protocols to the

 

connection-oriented paradigm of ATM:

 

LAN Emulation (LANE) — Supports transparent translation of higher

 

level protocols, such as IP, IPX, and AppleTalk protocols. LANE also

 

supports broadcast and multicast addressing.

 

Classical IP over ATM — Supports transparent translation of IP only

 

over ATM, and does not support broadcast or multicast addressing.

 

Classical IP is supported only in CoreBuilder 2500 Extended Switching

 

Software, version 8.1.0 or later. Thus, it does not apply to Intelligent

 

Switching Software version 8.1.2.

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3Com Version 8.1.2 manual ATM in Your, Network, LAN Emulation, Classical IP

Version 8.1.2 specifications

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