HP A5120 EI Series Configuration Guide

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To do…
Use the command…
Remarks
Enter system view
system-view
—
Enable global MAC address
learning
undo mac-address mac-learning
disable
Optional
Enabled by default.
Enter
interface view
or port group
view
Enter Layer 2
Ethernet interface
view or Layer 2
aggregate interface
view
interface interface-type interface-
number
Required
Use either command.
The configuration made in Layer
2 Ethernet or Layer 2 aggregate
interface view takes effect on the
current interface only. The
configuration made in port
group view takes effect on all
the member ports in the port
group.
Enter port group
view
port-group manual port-group-
name
Disable MAC address learning on
the interface or all ports in the port
group
mac-address mac-learning
disable
Required
Enabled by default.
NOTE:
 When MAC address learning is disabled, the obtained MAC addresses remain valid until they age out.
 For more information about port groups, see the chapter ―Ethernet interface configuration.‖
Configuring the aging timer for dynamic MAC address entries
The MAC address table uses an aging timer for dynamic MAC address entries for security and efficient
use of table space. If a dynamic MAC address entry has failed to update before the aging timer expires,
the switch deletes the entry. This aging mechanism ensures that the MAC address table can quickly
update to accommodate the latest network changes.
Set the aging timer appropriately. A long aging interval might cause the MAC address table to retain
outdated entries, exhaust the MAC address table resources, and fail to update its entries to accommodate
the latest network changes. A short interval might result in the removal of valid entries and unnecessary
broadcasts, which might affect device performance.
Follow these steps to configure the aging timer for dynamic MAC address entries:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Configure the aging timer for
dynamic MAC address entries
mac-address timer { aging
seconds | no-aging }
Optional
300 seconds by default.
You can reduce broadcasts on a stable network by disabling the aging timer to prevent dynamic entries
from unnecessarily aging out. By reducing broadcasts, you improve not only network performance, but
also security, because you reduce the chances that a data packet will reach unintended destinations.

HP A5120 EI Series Specifications

General

Uplink Ports	4 x SFP
Stacking	No
Management	CLI, Web, SNMP
Routing Protocols	RIP, OSPF
Power Supply	AC
MAC Address Table Size	16K
Dimensions	440 x 430 x 44 mm
Operating Temperature	0°C to 45°C
Operating Humidity	10% to 90% non-condensing
Model	HP A5120-24G EI Switch (JG234A)
VLANs	4094