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Sample Situations for Use of the LECS Assignment Policies
The following section offers examples of various LECS assignment policies.
ATM Address Policy
The LECS permits two types of ATM address policy values. The first type is a
variable length ATM address prefix. For example, the policy value
(3999999999999900000102, LES_A) means that all LE clients whose ATM address
begins with 3999999999999900000102 should be assigned to LES_A.
The second type of ATM address policy value is an ESI and Selector of an ATM
address. For example, the policy value (10002345003281, LES_A) means that the
LE client with an ESI of 100023450032 and a selector of 81 should be assigned to
LES A.
When given the ATM address of an LE client, the LECS searches first for a
matching ESI and selector. If no match is returned, the LECS searches for the ATM
address prefix policy value with the longest matching prefix. Thus, for example, the
above policy value (399999999999990000, LES_B).
ATM address ESI and selector policy values can be used to assign clients to LESs
in a manner independent of the LE clients physical location (the ESI and selector is
defined locally to the client). ATM address prefixes are the only policy values which
indicate any geographic information.
LAN Destination Policy
LE clients can be assigned to LESs based upon a MAC address or a route
descriptor. Because a LAN destination uniquely identifies an LE client in a manner
that is independent of geographic location, this policy is useful in ensuring that the
LE client is assigned to the correct ELAN regardless of its physical location, for
example, retaining the ELAN memberships of a workstation when it is moved from
one switch to another.
ELAN Name Policy
ELAN names are perhaps the most flexible of the assignment criteria. Some of the
ways that ELAN name policy values can be used are:
v Use the actual name of the ELAN
If LES_A serves Elan 1, then create the policy value (Elan 1, LES_A). LE clients
specifying Elan 1 in configuration requests will then be assigned to LES_A.
v Use aliases for the ELAN
For example, all LE clients belonging to members of the Accounting Department
could be configured to use the ELAN name
Accounting
, while those belonging to
the Engineering Department could use the ELAN name
Engineering
. Depending
upon the number of LE clients on the ELANs, these names could be directed to
the same ELAN by configuring these policy values:
(Accounting, LES_A)
(Engineering, LES_A)
or to different ELANs by configuring these policy values:
(Accounting, LES_A)
(Engineering, LES_B)
Overview of LAN Emulation
262
MRS V3.2 Software User’s Guide