Clearing Learned Entries; Dpvm Database Distribution; About Dpvm Database Distribution; Disabling Dpvm Database Distribution - Cisco MDS 9000 Series Configuration Manual

Clearing Learned Entries

Clearing Learned Entries
You can clear DPVM entries from the active DPVM database (if autolearn is still enabled) using one of two
methods.
• To clear a single autolearn entry, use the clear dpvm auto-learn pwwn command.
switch# clear dpvm auto-learn pwwn 55:22:33:44:55:66:77:88
• To clear all autolearn entries, use the clear dpvm auto-learn command.
switch# clear dpvm auto-learn
Note
These two commands do not start a session and can only be issued in the local switch.

DPVM Database Distribution

If the DPVM database is available on all switches in the fabric, devices can be moved anywhere and offer the
greatest flexibility. To enable database distribution to the neighboring switches, the database should be
consistently administered and distributed across all switches in the fabric. The Cisco NX-OS software uses
the Cisco Fabric Services (CFS) infrastructure to achieve this requirement (refer to the Cisco MDS 9000
Family NX-OS System Management Configuration Guide ).
This section describes how to distribute the DPVM database and includes the following topics:

About DPVM Database Distribution

Using the CFS infrastructure, each DPVM server learns the DPVM database from each of its neighboring
switches during the ISL bring-up process. If you change the database locally, the DPVM server notifies its
neighboring switches, and that database is updated by all switches in the fabric.
If fabric distribution is enabled, all changes to the configuration database are stored in the DPVM pending
database. These changes include the following tasks:
• Adding, deleting, or modifying database entries.
• Activating, deactivating, or deleting the configuration database.
• Enabling or disabling autolearning.
These changes are distributed to all switches in a fabric when you commit the changes. You can also discard
(abort) the changes at this point.
Tip You can view the contents of the DPVM pending database by issuing the show dpvm pending command.

Disabling DPVM Database Distribution

To disable DPVM database distribution to the neighboring switches, follow these steps:
Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
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Creating Dynamic VSANs