Disable Learning Ports - Extreme Networks ExtremeWare Command Reference Manual

Commands for Configuring Slots and Ports on a Switch

disable learning ports

disable learning ports <portlist>
Description
Disables MAC address learning on one or more ports for security purposes.
Syntax Description
portlist Specifies one or more ports or slots and ports. On a modular switch, can be a list of slots and ports. On
a stand-alone switch, can be one or more port numbers. May be in the form 1, 2, 3-5, 2:*, 2:5, 2:6-2:8.
Default
Enabled
Usage Guidelines
On a modular switch,
<portlist>
can be one or more port numbers.For a detailed explanation of port specification, see "Modular Switch
Numerical Ranges" or "Stand-alone Switch Numerical Ranges" in Chapter 1.
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 forwarding
databases (FDBs) per port.
NOTE
Disabling port learning does not disable forwarding once L3 forwarding and the corresponding learning
of FDB and IPFDB tables has been turned ON, Forwarding of traffic through a particular port does not
stop even after port learning is disabled for that port. This characteristic is a known behavior of
ExtremeWare.
Example
The following command disables MAC address learning on port 4 on a stand-alone switch:
disable learning ports 4
History
This command was first available in ExtremeWare 2.0.
This command was modified in ExtremeWare 6.1 to support PoS modules.
This command was added to the Summit "e" series of switches in ExtremeWare 7.1e.
Platform Availability
This command is available on all platforms.
294
can be a list of slots and ports. On a stand-alone switch,
<portlist>
ExtremeWare 7.5 Command Reference Guide