Non-VLAN-Capable Switch CAM Table Operation
A Switch uses its CAM (Content addressable memory) table to
store MAC addresses and the associated port where each MAC address was learned.
Once the Switch receives a frame, it uses its CAM table in order to determine
what to do with the frame.
1.
If the destination MAC address is not appearing
in the CAM table, then the Switch sends (Flood) the frame to all ports except
for the port through which it arrived.
2.
If the destination MAC address appears in the
CAM table, then the frame is sent to the identified port for transmission.
(Forward)
3.
If the destination MAC address comes from the
same port on which it was received, it is discarded. (Filter)
4.
If the destination MAC address is a broadcast or
multicast address, then the frame is sent to all ports, excluding the received
port. (Flood)
VLAN-Capable Switch CAM Table Operation
A Switch uses its CAM table to store MAC addresses and the
associated port and the port VLAN ID where each MAC address was learned. Once
the Switch receives a frame, it uses its CAM table to determine which action to
take.
1.
If the destination MAC address is not appearing
in the CAM table, then the Switch sends (Flood) the frame to all ports with
matching VLAN ID, excluding the received port.
2.
If the destination MAC address appears in the
CAM table, then the frame is sent (Forward) to the port with matching VLAN ID
for transmissions.
3.
If the destination MAC address comes from the
same port on which it was received, it is discarded. (Filter)
4.
If the destination MAC address is a broadcast or
multicast address, then the frame is sent (Flood) to all ports with matching
VLAN ID, excluding the received port.
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