3Com Switch 7750 Configuration Guide

Configuring MAC Address Table Management 229
Disabling MAC Address
Learning
To gain better control over network security, you can use the following commands
to disable the current port from learning MAC addresses.
n
■ Do not use the mac-address mac-learning disable command together with
related 802.1x commands in Ethernet port view.
■ Do not use the mac-address mac-learning disable command together with
the mac-address max-mac-count command.
Configuring MAC
Address Learning
Synchronization
Between Module Chips
If there are multiple chips on a module, each chip can learn only the MAC
addresses of the data flow it handles. If a chip receives a packet whose MAC
address entry is stored in another chip, it broadcasts the packet.
You can configure MAC address learning synchronization between module chips
to synchronize MAC address entries between chips. This reduces broadcasting of
unknown packets, lowers switch processing load, and improves network
utilization.
Disabling HiGig Ports
from Learning MAC
Addresses
The Switch 7750 learn MAC address entries in one of the following ways:
■ Through MAC address learning on the port
■ By synchronizing MAC address entries between chips
Table 156 Set the maximum number of MAC addresses a port can learn
Operation Command Description
Enter system view system-view -
Enter Ethernet port
view
interface interface-type
interface-number
-
Set the maximum
number of MAC
addresses the port can
learn
mac-address max-mac-count
count
Required
By default, the number of the
MAC addresses a port can learn is
not limited.
Table 157 Disable the current port from learning MAC addresses
Operation Command Description
Enter system view system-view -
Enter Ethernet port view interface interface-type
interface-number
-
Disable the current port from
learning MAC addresses
mac-address
mac-learning disable
Required
By default, the port is enabled
to learn MAC addresses.
Table 158 Configure MAC address learning synchronization between module chips
Operation Command Description
Enter system view system-view -
Enable MAC address learning
synchronization between
module chips
mac-address learning
synchronization
Optional
By default, MAC address
learning synchronization
between module chips is
disabled.