Cisco MDS 9000 Series Configuration Guide

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
These two commands do not start a session and can only be issued in the local switch.
Note
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.
You can view the contents of the DPVM pending database by issuing the show dpvm pending command.
Tip
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
26
Creating Dynamic VSANs
Clearing Learned Entries

Cisco MDS 9000 Series Specifications

General

Category	Switch
Operating System	Cisco NX-OS
Ports	Varies by model
Protocols	Fibre Channel (FC), Fibre Channel over IP (FCIP), iSCSI
Redundancy	Redundant supervisors, power supplies, and fans
Management	Cisco Data Center Network Manager (DCNM), CLI, SNMP
Virtualization Support	VSANs (Virtual SANs)
Security Features	Fibre Channel Security Protocol (FC-SP)
Hot Swappable Components	power supplies, fans
Power Supply Options	AC and DC options available