3Com 7757 Configuration Manual page 229

Disabling MAC Address
Learning
n
Configuring MAC
Address Learning
Synchronization
Between Module Chips
Disabling HiGig Ports
from Learning MAC
Addresses
Table 156 Set the maximum number of MAC addresses a port can learn
Operation Command
Enter system view system-view
Enter Ethernet port interface interface-type
view interface-number
Set the maximum mac-address max-mac-count
number of MAC count
addresses the port can
learn
To gain better control over network security, you can use the following commands
to disable the current port from learning MAC addresses.
Table 157 Disable the current port from learning MAC addresses
Operation
Enter system view
Enter Ethernet port view
Disable the current port from
learning MAC addresses
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.
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.
Table 158 Configure MAC address learning synchronization between module chips
Operation
Enter system view
Enable MAC address learning
synchronization between
module chips
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
■
Configuring MAC Address Table Management
Description
-
-
Required
By default, the number of the
MAC addresses a port can learn is
not limited.
Command
system-view
interface interface-type
interface-number
mac-address
mac-learning disable
Command
system-view
mac-address learning
synchronization
229
Description
-
-
Required
By default, the port is enabled
to learn MAC addresses.
Description
-
Optional
By default, MAC address
learning synchronization
between module chips is
disabled.