Chapter 13 LANE Services
186 Avaya M770 ATM Switch User’s Guide
Proprietary Distributed LANE Services
The M770 ATM Switch LECS supports a proprietary system for a distributed LES/
BUS in advance of implementing LANE version 2. This will enable not only
resiliency of the ELAN but will also increase the number of clients (LECs) that can
be supported per ELAN on multiple modules (up to 2,500 LECs per ELAN). This is
achieved by allowing a single ELAN to be distributed over multiple LES/BUS pairs
in several modules (up to 10 LES/BUS’s per ELAN). Each client connects to a single
LES/BUS as normal but it could be any of the LES/BUS pairs that are supporting
the ELAN.
Virtual Channel Connection (VCC) requirements
In a single ELAN that supports the proprietary Distributed LANE Service:
• each LES has a point-to-point and a point-to-multipoint VCC mesh to each of
the other LESes in the ELAN.
• each BUS has a point-to-point and a point-to-multipoint VCC mesh to each of
the other BUSes in the ELAN
These connections are then used to exchange information about the registered
clients in the ELAN.
Setting up Distributed LANE Services
The M770 ATM Switch module sets up distributed LANE services as follows:
1 When a distributed LES registers with the LECS, it is assigned a LEC id range
and given the addresses of other distributed LESes on the ELAN.
2 The LES will then setup a point-to-point and point-to-multipoint with the other
LESes on the ELAN.
3 Once connections are setup between the distributed LESes on the ELAN, the
LESes will exchange information about their LECs (clients). In this way all the
LESes in the ELAN will know of all other clients on the ELAN, and which LES
they are attached to.
4 Each LES will also discover the address of every BUS in the ELAN. This
information is then used to setup a point-to-point and point-to-multipoint VCC
mesh between the BUSes.
LEC Assigned for a Distributed ELAN
When the LEC starts up, it will connect to the LECS in the usual way. If there are
several different possible LESes for an ELAN, then the LECS will select which one of
the distributed LES addresses to assign the LEC to.
One of the following methods can be configured:-