Westermo U100 - Manual (Page 8)

OnTime Industrial Ethernet
100 Series
V 1.0
- 8 -
Section 1.3.1
Switch Operation (Cont..)
MAC Table
A MAC table can hold up to 8000 entries; and with a total packet memory of over 1MB this is
adequate for normal networks. Naturally, devices will be disconnected from Ports during the
life of a network. If the MAC table did not automatically monitor for idle nodes the table would
become full. If a node has been idle for more than a few seconds the source and destination
information for that node will be deleted from the table. This is commonly known as the ‘age
time’. To reset the table power cycle the Switch.MAC table size is normally always large
enough for industrial networks. Packet memory size on the other hand can affect performance
and ability to handle short high load/overload situations when an event occurs in a control
network or similar industrial network.