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DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide
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Link Aggregation
Understanding Port Trunk Groups
Port trunk groups are used to combine a number of ports together to make a single high-bandwidth data pipeline. The
Switch supports up to 32 port trunk groups with up to 8 ports in each group.
Figure 5-67 Example of Port Trunk Group
The Switch treats all ports in a trunk group as a single port. Data transmitted to a specific host (destination address)
will always be transmitted over the same port in a trunk group. This allows packets in a data stream to arrive in the
same order they were sent.
Link aggregation allows several ports to be grouped together and to act as a single link. This results in a bandwidth
that is a multiple of a single link's bandwidth. Link aggregation is most commonly used to link bandwidth intensive
network devices, such as servers, to the backbone of a network.
The Switch allows the creation of up to 32 link aggregation groups, each group consisting of up to 8 links (ports). Each
port can only belong to a single link aggregation group. Load balancing is automatically applied to the ports in the
aggregated group, and a link failure within the group causes the network traffic to be directed to the remaining links in
the group.
The Spanning Tree Protocol will treat a link aggregation group as a single link. If two redundant link aggregation
groups are configured on the Switch, STP will block one entire group; in the same way, STP will block a single port
that has a redundant link.
NOTE: If any ports within the trunk group become disconnected, packets intended for the
disconnected port will be load shared among the other linked ports of the link aggregation
group.
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