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B
Dynamic Link Context System
(DLCS)
This appendix describes:
• How the ExtremeWare Enterprise Manager policy system uses The Dynamic Link
Context System (DLCS) to map logical endstations (users, hosts) to physical
attributes.
• How to enable DLCS on Extreme switches running ExtremeWare 5.0 or later.
• Limitations with DLCS as implemented in ExtremeWare 5.0.
O
VERVIEW
DLCS is a feature that snoops Windows Internet Naming Service (WINS) NetBIOS
packets and creates a mapping between a user name, the IP address of the host (end
station) and the switch and port. Based on the information in the packet, DLCS can
detect when an end station boots up or shuts down, or a user logs in or logs out. When
an end station boots up, DLCS associates its name and IP address to a port on a switch.
Similarly, when a user logs in, DLCS associates the user with an end station, and thus a
switch port. Such learned information is discarded when the user logs out, or when the
end station is shut down.
This information is used by the ExtremeWare Enterprise Manager in setting policies that
can be applied to users. These policies can dynamically follow a user's location if auto
configuration of policies is enabled. For DLCS to operate within ExtremeWare, the user
or end station must allow automatic DLCS updates. This feature should only be used in
conjunction with the ExtremeWare Enterprise Manager Policy System.
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B-1
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