D-Link DES-3326 - Manual (Page 155)

DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
Figure 6-75. Link Aggregation screen
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
aggregation group may not cross an 8-port boundary, starting with port 1 (a group may not contain
ports 8 and 9, for example) and all of the ports in the group must be members of the same VLAN.
Further, the aggregated links must all be of the same speed and should be configured as full duplex.
The configuration of the lowest numbered port in the group becomes the configuration for all of the
ports in the aggregation group. This port is called the Master Port of the group, and all configuration
options – including the VLAN configuration – that can be applied to the Master Port are applied to the
entire 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, on the switch level. On
the port level, the STP will use the port parameters of the Master Port in the calculation of port cost and
in determining the state of the link aggregation group. 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.
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