Note: MAC-notifications for LAG should be enabled on the LAG interface.
When enabled, each MAC address addition or deletion is logged as an event in a buffer-queue.
Each event is 11 bytes long and contains information about the following:
Value
Description
MAC address
The MAC address added or deleted on the device.
VLAN
The VLAN to which the MAC address is associated. The valid range is 1 to 4094.
Interface
The interface on which the MAC address is added or deleted.
Action
The event that occurred.
The following table lists the various events that can occur, along with the VLAN interface
values and their interpretation for each event:
MAC address notification events and values
Event
Action Value
Description
Expected action by management software
VLAN and port values
ADD-MAC
1
This event is generated when a new MAC address is learnt.
Management software should add the MAC address to its forwarding table.
(VLAN, Port)
REMOVE-MAC
2
This event is generated when the MAC address ages out.
Management software should delete the MAC address from its forwarding table.
(VLAN, Port)
REMOVE-ALL-MAC-ON-SYSTEM
3
This event is generated when all the MAC
addresses on the system are flushed, for example, by using the clear
mac-address command.
Management software should clear all the MAC addresses from its forwarding table.
(0, 0)
REMOVE-ALL-MAC-ON-PORT
4
This event is generated when all the MAC addresses on a particular port are flushed,
for example, when the link goes down.
Management software should clear all the MAC addresses learnt on this particular port
from its forwarding table.
(0, Port)
REMOVE-ALL-MAC-ON-VLAN
5
This event is generated when the MAC addresses learnt on all ports, in a particular
VLAN are flushed, for example, by using the
no vlan command.
Management software should clear all the MAC addresses learnt on this particular VLAN
from its forwarding table.
(VLAN, 0)
REMOVE-ALL-MAC-ON-VLAN-PORT
6
This event is generated when the MAC addresses, are flushed for a particular port
in a particular VLAN, for example by a protocol flush event.
Management software should clear all the MAC addresses learnt on this particular VLAN
and port from its forwarding table.
(VLAN, Port)
MAC-MOVE
7
This event is generated when the MAC address moves from an old port to a new port
in the same VLAN.
Management software should move the MAC address from the old port to the specified
new port learnt in its forwarding table.
(VLAN, new port)
Working with MAC-notification events
Each event stored in the buffer queue is in the order in which the event occurred
in the system.
The number of events that can be stored in the buffer queue is by default 4000. This
value is configurable up to 16000 through the command line interface.
An out-of-band buffer full event trap is sent to the management software in the event
of a buffer full. The system then flushes the existing buffer queue.
You can configure a periodic interval at which point a MAC-notification trap should
be sent to the management software. The interval can range from 1 to 3600 seconds.
The default is 3 seconds.
Each trap message sent on the notification interval can have one or more MAC-notification
events taken from the buffer queue in the first-in first-out order.
One or more SNMP trap messages can be sent on the expiry of a MAC-notification interval.
However, the maximum number of trap messages that can be sent is limited to 5.