Disabling Mac Address Learning; Fdb Configuration Examples; Configuring The Fdb Aging Time - Extreme Networks ExtremeWare XOS Guide Manual

Permanent entries—Permanent entries are retained in the database if the switch is reset or a power
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off/on cycle occurs. Permanent entries must be created by the system administrator through the CLI.
Permanent entries are static, meaning they do not age or get updated.

Disabling MAC Address Learning

By default, MAC address learning is enabled on all ports. You disable learning on specified ports using
the following command:
disable learning port [<port_list> | all]
If MAC address learning is disabled, only broadcast traffic, EDP traffic, and packets destined to a
permanent MAC address matching that port number, are forwarded. Use this command in a secure
environment where access is granted via permanent FDBs per port. Disabling learning on a port causes
the MAC addresses to flood because the will not be present in the FDB during a destination lookup.

FDB Configuration Examples

The following example adds a permanent static entry to the FDB:
create fdbentry 00:E0:2B:12:34:56 vlan marketing port 3:4
The permanent entry has the following characteristics:
MAC address is 00:E0:2B:12:34:56.
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VLAN name is marketing.
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Slot number for this device is 3.
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Port number for this device is 4.
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NOTE
On the Aspen 8810 switch, if the MAC address 00:E0:2B:12:34:56 is encountered on any port/VLAN other than
VLAN marketing, port 3:4, that address will be handled as a blackhole entry, and packets from that source will be
dropped.

Configuring the FDB Aging Time

You configure the aging time for dynamic FDB entries using the following command:
configure fdb agingtime <seconds>
If the aging time is set to zero, all aging entries in the database are defined as static, nonaging entries.
This means the entries will not age out, but non-permanent static entries can be deleted if the switch is
reset. Supported aging is between 15 and 1,000,000 seconds. The default is 5 minutes (300 seconds).
ExtremeWare XOS 11.1 Concepts Guide
FDB Configuration Examples
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