Configuring the mac learning limit on a vlan, Enabling mac address migration log notifying – H3C Technologies H3C S12500 Series Switches User Manual
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Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Ethernet interface, port
group, or Layer 2 aggregate
interface view.
•
Enter Ethernet interface view:
interface
interface-type
interface-number
•
Enter port group view:
port-group manual
port-group-name
•
Enter Layer 2 aggregate
interface view:
interface bridge-aggregation
interface-number
Use any command.
Settings in Ethernet
interface view or Layer
2 aggregate interface
view take effect on the
current port only.
Settings in port group
view take effect on all
the member ports in the
port group.
3.
Configure the MAC learning
limit on an interface, and
configure whether frames with
unknown source MAC
addresses can be forwarded
when the MAC learning limit is
reached.
mac-address
max-mac-count
{
count |
disable-forwarding }
By default, the
maximum number of
MAC addresses that
can be learned on an
interface is not
specified, and frames
with unknown source
MAC addresses are
forwarded when the
MAC learning limit is
reached.
Configuring the MAC learning limit on a VLAN
You can also limit the number of MAC addresses that can be learned on a per-VLAN basis.
To configure the MAC learning limit on a VLAN:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter VLAN view.
vlan vlan-id
N/A
3.
Configure the MAC leaning
limit on a VLAN, and
configure whether or not
frames with unknown source
MAC addresses can be
forwarded in the VLAN when
the upper limit is reached.
mac-address
max-mac-count
{
count |
disable-forwardin
g }
By default, the maximum
number of MAC addresses
that can be learned on a
VLAN is not specified, and
frames with unknown source
MAC addresses are
forwarded when the MAC
learning limit is reached.
Enabling MAC address migration log notifying
To discover and locate Layer 2 loops, you can enable MAC address migration log notifying.
MAC address migration refers to this process: a device learns a MAC address from an interface, Port A
for example, and the device later learns the MAC address from another interface, Port B for example. If