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C
ONTENTS
A
BOUT
T
HIS
G
UIDE
Introduction 1
Terminology 1
ATM Terminology 1
Finding Information in This Guide 2
Conventions 2
Related Documentation 3
1
F
EATURES
AND
B
ENEFITS
ATM Benefits 1-1
ATM Module Features 1-2
2
N
ETWORK
L
AYER
C
ONCEPTS
The Layered Network Architecture 2-1
Upper Layer Protocols 2-2
What is LAN Emulation (LANE)? 2-2
LAN Emulation Components 2-3
LAN Emulation Client (LEC) 2-3
LAN Emulation Server (LES) 2-3
Broadcast and Unknown Server (BUS) 2-3
LAN Emulation Configuration Server (LECS) 2-3
LAN Emulation Components in Your Network 2-4
LAN Emulation and IBM Devices 2-4
Joining the ELAN 2-5
Locating the LECS 2-5
Mapping Ethernet and ATM Addresses 2-6
Address Resolution 2-6
LAN Emulation Address Resolution Protocol (LE_ARP)
2-7
What Happens to Unicast Frames? 2-7
What Happens to Broadcast and Multicast Frames? 2-7
ATM Adaptation Layer (AAL) 2-8
Asynchronous Transfer Mode (ATM) Layer 2-8
ATM is Cell-based 2-8
ATM is Service Transparent 2-9
ATM is Connection-oriented 2-9
Switched Virtual Circuits (SVCs) 2-12
Permanent Virtual Circuits (PVCs) 2-12
ATM Interfaces 2-12
Interim Local Management Interface (ILMI) 2-13
ATM Address Registration 2-13
The ATM Layer and Cell Structure 2-14
Physical Layer 2-15
SONET STS-3c 2-15
SDH STM-1 2-15
3
V
IRTUAL
LAN C
ONCEPTS
What is a Virtual LAN (VLAN)? 3-1
Creating Inter-switch VLANs 3-1
Extending VLANs into the ATM Network 3-2