Appendix G Dynamic Link Context System (Dlcs); Overview Of Dlcs; Using Dlcs With The Policy Manager - Extreme Networks EPICenter Software Installation Manual
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- Reference manual (580 pages) ,
- Manual (268 pages) ,
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G
Dynamic Link Context System (DLCS)
This appendix describes:
• How the EPICenter policy system uses the Dynamic Link Context System (DLCS) to map logical end
stations (users, hosts) to physical attributes
• How to enable DLCS on Extreme switches running ExtremeWare 5.0 or later
• Limitations of DLCS as implemented in ExtremeWare 5.0
Overview of DLCS
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, and the switch and port. Based on the
information in the packet, DLCS can detect when a host boots up or shuts down, or a user logs in or
logs out. When a host 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 a host, and thus a switch port. Such
learned information is discarded when the user logs out, or when the host is shut down.
This information is used by the EPICenter software 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 host must allow automatic DLCS updates. This
feature should only be used in conjunction with the EPICenter Policy Manager.
EPICenter uses DLCS information to create a policy object for a user or host that is mapped to the
appropriate physical attributes (IP address, switch, and port).
Using DLCS with the Policy Manager
For DLCS to operate within the EPICenter policy system, two conditions must be met:
• DLCS must be enabled on the switch.
• In the Policy Manager client, the user or host must be set to allow automatic DLCS updates.
If both of these conditions are true, the policy system will expect to get current physical attributes for
the user or host dynamically through DLCS. If auto configuration is enabled in the Policy Manager
client, then dynamic data learned through DLCS will also update the configured policies.
EPICenter Software Installation and User Guide
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