Configuring The Mac Learning Limit On Ports; Enabling Mac Address Roaming - HP 5820X series Configuration Manual

To do...
1. Enter system view
2. Configure the aging timer for
dynamic MAC address entries
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 the chances for a data packet to reach unintended destinations are reduced.

Configuring the MAC learning limit on ports

To prevent the MAC address table from getting too large, you can limit the number of MAC addresses
that can be learned on a port.
To configure the MAC learning limit on a Layer 2 Ethernet interface or all ports in a port group:
To do...
1. Enter system view
2. Enter Layer
2 Ethernet
interface
view or
port group
view
3. Configure the MAC learning limit on
the interface or port group
Layer 2 aggregate interfaces do not support the mac-address max-mac-count command.
Do not configure the MAC learning limit on any member ports of an aggregation group. Otherwise, the
member ports cannot be selected.

Enabling MAC address roaming

After you enable MAC address roaming on an IRF fabric, each member switch advertises learned MAC
addresses to other member switches.
As Figure 7 shows, Device A and Device B form an IRF fabric enabled with MAC address roaming. They
connect to AP C and AP D, respectively. When Client A associates with AP C, Device A learns the MAC
address of Client A and advertises it to the member switch Device B.
Use the command...
system-view
mac-address timer { aging
seconds | no-aging }
Enter Layer 2 Ethernet
interface view
Enter port group view
Use the command...
system-view
interface interface-type
interface-number
port-group manual port-
group-name
mac-address max-mac-
count count
28
Remarks
—
Optional
300 seconds by default
Remarks
—
Use either command.
The configuration made in Layer
2 Ethernet interface view takes
effect on the current interface
only. The configuration made in
port group view takes effect on
all member ports in the port
group.
Required.
No MAC learning limit is
configured by default.