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Draytek VigorSwitch G1240 Manual

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VigorSwitch G1240 User’s Guide
29
The switch port can run at different speed, such as 10Mbps, 100Mbps or 1000Mbps. A
shared hub cannot afford this.
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Traffic aggregation is to aggregate the bandwidth of more than one port and treat it as a
single port in the LAN. This single port possesses the features of a normal port but loading
balance. This is a great feature for the port needing more bandwidth but cannot afford
paying much cost for high bandwidth port.
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A Layer 2 switch uses some features of the Data Link layer in OSI model to forward the
packet to the destination port(s). Here we introduce some important features of a switch
and how they work.
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When a packet is received on a port of switch, the switch first checks if the packet good or
bad and extracts the source MAC address (SA) and destination MAC address (DA) to find
1) if SA is existed in the MAC address table, if no, puts it in the MAC address table, if yes,
2) looks up DA and its associated port to which the traffic is forwarded. If DA does not
exist, have the packet broadcasted.
Due to the size of the MAC address limited, MAC address aging function is applied. When
the MAC address has resided and keeps no update in the table for a long time, this means
the traffic using that entry has yet come for a while. If this time period is more than the
aging time, the entry will be marked invalid. The vacancy is now available for other new
MAC.
Both learning and forwarding are the most important functions in a switch. Besides that,
VLAN can be one of the rules to forward the packet. There are ingress rule and egress rule
applied. The ingress rule is used to filter the incoming packet by VLAN ID and so on and
… 35 …


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