Appendix D
Components in LANE Services
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Cajun M770 ATM Switch User’s Guide
the LECS. The LECS decides which LES to direct a LEC to, on the basis of the
information that the LEC gives it. For example, the LEC may provide the name of
the ELAN it expects to join. Alternatively, the LECS may be configured to associate
a particular LEC with a specific ELAN.
Discovering the ATM address of another LEC
Every LEC has one or more LAN addresses (for example, MAC address) and an
ATM address associated with it. When the network operating system passes a frame
to a LEC to transmit, the LEC checks whether it already has a connection set up to
that frame's LAN destination address. If there is no existing connection, the LEC
must discover the ATM address for that destination end-station, signal to the
network for a connection, and then transmit the data.
To discover an ATM address, the LEC consults its list of ATM stations that it has
communicated with. If the LEC cannot find the address it requires from its own list,
it will communicate with the LES for the required address.
When a LEC needs an ATM address, it sends a LANE ARP (Address Resolution
Protocol) request to the LES. If the LES knows the ATM address, it sends it to the
LEC. If it does not know the ATM address, the LES may forward the address request
to any LECs that are registered with it so that they can respond directly to the LES.
The LES will then forward the response to the LEC.
Setting up the connection
When the LEC has discovered the ATM address of the required LEC, it signals to the
ATM network for a Virtual Circuit Connection (VCC) to that LEC.
Transmitting the data
When the VCC is set up, the LEC transmits its data through the ATM network to
the destination LEC.
Locating the LECS, LES, and BUS services
An ATM network may contain several ELANs. The network must only have one
LECS, and each ELAN must have one active LES and one BUS (which may be part
of a distributed LES/BUS).
The LECS, LES, and BUS constitute the LANE Services. These elements must reside
on hosts that all the LECs on a network can access. They can be located on the same
host or on different hosts, which may be one of the following:
•
An ATM switch
•
A dedicated workstation
•
An existing or dedicated server. For example, the services could be
implemented as NetWare Loadable Modules (NLMs) on a NetWare server.
Summary of Contents for CAJUN M770
Page 2: ...2 Cajun M770 ATM Switch User s Guide...
Page 14: ...xii Cajun M770 ATM Switch User s Guide...
Page 54: ...Chapter 4 Managing Miscellaneous Commands 36 Cajun M770 ATM Switch User s Guide...
Page 64: ...Chapter 5 Managing Physical Ports 46 Cajun M770 ATM Switch User s Guide...
Page 106: ...Chapter 6 Managing Virtual Ports 88 Cajun M770 ATM Switch User s Guide...
Page 112: ...Chapter 7 Managing Module Hardware 94 Cajun M770 ATM Switch User s Guide...
Page 122: ...Chapter 8 Managing PVC Connections 104 Cajun M770 ATM Switch User s Guide...
Page 158: ...Chapter 11 Managing the Management LEC 140 Cajun M770 ATM Switch User s Guide...
Page 176: ...Chapter 13 LANE Services 158 Cajun M770 ATM Switch User s Guide...
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