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This soft copy for use by IBM employees only.
It is not necessary to pre-define the LECS′ address on each LEC
definition if you have a LECS since the mechanisms by which the
LECs dynamically use a specific ATM address of the LECS are
standardized.
When the 8285 LEC is attached to this type of ELAN, the SET DEVICE
LAN_EMULATION_CLIENT command with the parameter
NO_LES_WITH_LECS followed by NONE is used to get the LECS ATM
address dynamically. The IBM 8285 will search for the LECS ATM
address, first using ILMI. If it does not find it, then it will try using the
LECS well-known address (WKA) as specified in the standard. To
use the dynamic LECS ATM address resolution, you must not forget
to define the specific ATM address of LECS in the IBM 8285 definition
using the SET LAN_EMUL CONFIGURATION_SERVER command.
The LEC automatically starts when the SET DEVICE
LAN_EMULATION_CLIENT command is issued and it cannot be stopped after
starting. If you really need to clear the LEC parameters, you should clear the
parameters using CLEAR CONFIGURATION command in maintenance mode.
•
LECS / IBM 8285 Addressing
The IBM 8285 doesn′t have the LECS but does interwork with the external
LECS. When you have an external LECS and resolve the specific ATM
address of LECS dynamically, such as using ILMI and well-known Address
(WKA), you have to define the real ATM address of it to register it on the
LECS address table in the IBM 8285.
To register the real ATM address of LECS, use the SET LAN_EMUL
CONFIGURATION_SERVER command with the following parameter:
− ACTIVE_WKA or INACTIVE_WKA
The LECS address table contains an ATM address to be substituted for
the WKA. You can define the specific ATM address of WKA as Active
WKA. In an 8285, you can define only one active WKA entry. But you
can also define 4 Inactive WKA entries in addition. The ACTIVE_WKA or
INACTIVE_WKA option is followed by the specific ATM address of it. The
ACTIVE_WKA option replaces current Active WKA.
Note
As described above, the SET LAN_EMUL CONFIGURATION_SERVER
command is used to define the specific ATM address of LECS for ILMI
MIB. Then the active WKA has no meaning and all entries defined on
the table are included in the MIB in the order of index (Index 1 should
be top of the ILMI MIB entries). It means that you can have LECS
redundancy by defining multiple LECSs, which have the same
configuration on the IBM 8285/8260s in your campus ATM network.
7.2.3 Configuring a Simple LANE Network
Figure 42 on page 136 and Figure 43 on page 136 show a simple LANE network,
both physically and logically, comprised of an IBM 8285 and workstations.
Chapter 7. IBM 8285 Configuration 135