Setting The Maximum Number Of Mac Addresses A Port Can Learn; Enabling Destination Mac Address Triggered Update - H3C S3100-52P Operation Manual

Operation Manual – MAC Address Table Management
H3C S3100-52P Ethernet Switch

1.2.4 Setting the Maximum Number of MAC Addresses a Port Can Learn

The MAC address learning mechanism enables an Ethernet switch to acquire the MAC
addresses of the network devices on the segment connected to the ports of the switch.
By searching the MAC address table, the switch directly forwards the packets destined
for these MAC addresses through the hardware, improving the forwarding efficiency. A
MAC address table too big in size may prolong the time for searching MAC address
entries, thus decreasing the forwarding performance of the switch.
By setting the maximum number of MAC addresses that can be learnt from individual
ports, the administrator can control the number of the MAC address entries the MAC
address table can dynamically maintain. When the number of the MAC address entries
learnt from a port reaches the set value, the port stops learning MAC addresses.
Follow these steps to set the maximum number of MAC addresses a port can learn:
Enter system view
Enter Ethernet port view
Set the maximum number
of MAC addresses the
port can learn
Note:
If you have configured the maximum number of MAC addresses that a port can learn,
you cannot enable the MAC address authentication or port security functions on the
port, and vice versa.

1.2.5 Enabling Destination MAC Address Triggered Update

By default, a switch updates its MAC address entries based on the source MAC
addresses of packets. However, this may cause the switch to perform unnecessary
broadcasts in some applications.
The destination MAC address triggered update function solves the above problem by
allowing the switch to update its MAC address entries according to destination MAC
addresses in addition to source MAC addresses. This function improves the availability
of the MAC address table.
Follow these steps to enable destination MAC address triggered update:
To do...
system-view
interface interface-type
interface-number
mac-address
max-mac-count count
Use the command...
1-8
Chapter 1 MAC Address Table
Management
Remarks
—
—
Required
By default, the number of
the MAC addresses a port
can learn is not limited.