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Chapter 3 System Features
AC 60 Software Features
3-20
255-700-025
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
Ethernet LAN Bridging
The Ethernet LAN bridging feature is provided on the Ethernet module. The
various functions and interfaces associated with Ethernet LANs are governed
by standards published by the Institute of Electrical and Electronics Engineers
(IEEE). The relationships of the various IEEE standards that affect LAN
bridging are shown in Figure 3-3.
Bridging is accomplished by relaying data from the MAC layer of one LAN to
the MAC layer of another LAN (see Figure 3-4).
Ethernet bridging over the ATM network is accomplished using ATM Forum
standards; that is, document RFC 1483, which specifies multiprotocol
encapsulation within ATM. Ethernet MAC data is encapsulated using ATM
Adaptation Layer 5 (AAL-5) and transported over the ATM network (see
Figure 3-5).
Figure 3-3. IEEE Protocols for Ethernet LANs (IEEE 802.1)
Figure 3-4. Ethernet Bridging via the MAC Layer (IEEE 802.1)
IEEE 802.3 Physical Layer
IEEE 802.3 CSMA/CD
Media Access Control (MAC) Layer
IEEE 802.1 Bridging
IEEE 802.2 Logical Link Control (LLC)
Layer
IEEE
802.1
Manage-
ment
LLC
Layer
End Station
LAN
Bridge
Relay
MAC
Layer
MAC
Layer
MAC
Layer
LLC
Layer
End Station
LAN
MAC
Layer
Содержание PacketStar AC 60
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