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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
An STP Group spanning tree works in the same way as the switch-level spanning tree, but the root
bridge concept is replaced with a root port concept. A root port is a port of the group that is elected on
the basis of port priority and port cost, to be the connection to the network for the group. Redundant
links will be blocked, just as redundant links are blocked on the switch level.
The STP on the switch level blocks redundant links between switches (and similar network devices).
The port level STP will block redundant links within an STP Group.
It is advisable to define an STP Group to correspond to a VLAN group of ports.
The following fields can be set:
Parameter Description
Cost
A Port Cost can be set from 1 to
65535. The lower the number, the
greater the probability the port will
be chosen to forward packets.
Priority
A Port Priority can be from 0 to 255.
The lower the number, the greater
the probability the port will be
chosen as the Root Port.
Link Aggregation
To configure a link aggregation group:
Click the Link Aggregation link on the Configuration menu:
Figure 7-61. Link Aggregation window
Link aggregation allows several ports to be grouped together and to act as a single link. This gives a
bandwidth that is a multiple of a single link’s bandwidth.
Link aggregation is most commonly used to link a bandwidth intensive network device or devices – such
as a server – to the backbone of a network.
The DES-3326 allows the creation of up to 6 link aggregation groups, each group consisting of up of up
to 8 links (ports). The aggregated links must be contiguous (they must have sequential port numbers)
except the two (optional) Gigabit ports – which can only belong to a single link aggregation group. A link
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