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3Com Switch 7750 Configuration Guide Guide

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Configuring MAC Address Table Management 213
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 Board Chips
If there are multiple chips on a board, 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 board chips to
synchronize MAC address entries between chips. This reduces broadcasting of
unknown packets, lowers switch processing load, and improves network
utilization.
Table 139 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 140 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 141 Configure MAC address learning synchronization between board chips
Operation Command Description
Enter system view system-view -
Enable MAC address learning
synchronization between
board chips
mac-address learning
synchronization
Optional
By default, MAC address
learning synchronization
between board chips is
disabled.