Dynamic Addresses - Dell PowerConnect 3048 User Manual

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Dynamic Addresses

The Dynamic Address lookup table allows you to view the MAC addresses
that are currently in the address database. When addresses are in the
database, the packets intended for those addresses are forwarded directly to
those ports. You can filter out the table by port, virtual local area network
(VLAN), and MAC address by checking those fields.
Dynamic MAC address learning is enabled by default. This is the standard
mode for a network switch. In some networks, the administrator may want
to create a secured network by disabling the dynamic address learning
capabilities. When this is done, all current dynamic address entries will be
locked in. These addresses will not age out and new addresses will not be
learned. In addition, if a new address is detected on a port, the switch will
disable the port with the new address, save the current settings to NVRAM,
and send out a Simple Network Management Protocol (SNMP) trap
warning. This feature is used to block computers that were not on the
network before the lockdown from attempting to access the network. Once
a port is automatically disabled, the administrator can reenable the port
manually. The NVRAM will only be saved the first time a given port detects
a new address. The aging time should be raised before disabling the
dynamic address learning to provide enough time for the switch to learn all
current MAC addresses without the possibility of aging out.
This page contains the following options by which to query the dynamic
MAC address table:
• Port — Check the option box and select a port from the drop-down
list.
VLAN ID — Check the option box and type the appropriate
•
VLAN ID.
• MAC Address — Check the option box and select the address from
the list box provided.
• Query button — Click this button to execute the query once you have
selected the criteria for the query.