Extreme Networks ExtremeWare 7.3.0, Command Reference Manual

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258 ExtremeWare Software 7.3.0 Command Reference Guide
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
Default
Enabled.
Usage Guidelines
On a modular switch,
<portlist>
can be a list of slots and ports. On a stand-alone 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.
Learning must be disabled to allow port flooding. See the
enable flooding
command for information
on enabling port flooding.
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.
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.