Network (IPs MAC)
Network - Configuration – MAC Table learning
Microsemi PDS-408G Web Management User Guide Ver. 1.0.1, 03-2019
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The following MAC learning options are available:
Auto
– Normal automatic source MAC address learning and filtering for every incoming packet.
Disable
- No MAC learning is done from the selected port. However, the same Switch MAC filtering
algorithm applies, meaning that the received incoming packet will be sent to a specific port in case the
destination MAC is in the MAC leaning table, or be flooded to all other ports
on the same VLAN in
case the destination MAC is unknown.
Secure
– Source MAC address learning is disabled for the selected port. Any incoming packet with
unknown source MAC will be discarded. This mode should be used whenever network communication
should be restricted to a limited number of network devices with known MAC address.
However, whenever a packet is received on another port configured as Auto (for example) with
destination MAC unknown, or multicast/broadcast, then this packet will be flooded to all other ports on
same VLAN including those configured as Secure.
4.6.3
VLAN Learning-Disabled configuration
Figure 4-12: VLAN Learning Configuration
It is possible to configure the Switch not to the learn source MAC address from specific VLAN, or a
group of VLANs. Incoming packets from learning-disabled VLANs will be forwarded to other ports as
before (no packet drop. Forward to specific port if destination MAC is known, or flood to all other ports
on same VLAN if destination MAC is unknown).
4.6.4
Static MAC Table Configuration
Figure 4-13: Static MAC Table Configuration
Static MAC address configuration affects mostly the way packets with destination MAC matching to one
of the static MAC addresses are being handled by the Switch.
Forwarding a packet with static destination MAC
– A packet with a destination MAC matching to
one of the static MAC table entries will be forward only to the checked ports. For example, if packet with
destination MAC 00-2A-59-4A-17-3B, as in the image above, will be received on port #2 (unchecked),
then it will be forwarded to ports 4,7,8,9 (checked)
Forwarding a packet with a static source MAC
– A packet with source MAC which is the same as
one of the MAC address in the static MAC table entries, for example 00-2A-59-4A-17-3B as in the
image above, which received from one of the unchecked source ports, will be forwarding as a usual
packet based on the destination MAC. The Switch MAC table will not update the source port from which
the packet was received.
NOTE:
To avoid unit management loss, please make sure that the link used for managing the unit was
added to the Static Mac Table before changing to secure learning mode.
NOTE:
The following example: 1,10-13,200,300 will disable source MAC learning from VLANs 1, 10, 11,
12, 13, 200, and 300.