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11-14
C
11: ATM N
HAPTER
LANE Components
ETWORKS
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C
A
C
B
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C
Figure 11-9 ATM Network Using LAN Emulation
Three important concepts are illustrated in Figure 11-9:
Network nodes may be members of the same LAN emulation service (ATM
LAN segment) even if they are connected to different switches in the
network, as long as the switches are interconnected.
Traffic destined for end nodes on the same LAN segment — for instance,
traffic between two native ATM nodes on segment C — is directed by the
LAN emulation service.
Traffic destined for end nodes on different LAN segments must be bridged
or routed. This means that each LAN emulation service is required to
forward traffic between nodes on segments A and B to the router.
Membership in an ATM LAN segment is defined by the logical membership
in a LAN emulation service rather than by a physical connection to a LAN
segment.
Each emulated LAN contains of:
One or more LAN Emulation Clients (LECs)
A single LAN Emulation Service, consisting of
One LAN Emulation Server (LES)
One Broadcast and Unknown Server (BUS)
In addition, there is also a LAN Emulation Configuration Server (LECS) that
services all of the emulated LANs (ELANs) that exist in the ATM network.
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C
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A B C
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B
Router
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