D-Link DGS-3312SR Product Manual page 58

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.
To configure port trunking, click on the LACP hyperlink in the Configuration folder and then click Link Aggregation:
To configure port trunk groups, click the Add button to add a new trunk group and then use the Port Trunking
Configuration window below to set up trunk groups. To change or delete a port trunk group, click the Modify or Delete
option in the Current Trunking Group Entries table pictured above.
The user-changeable parameters are as follows:
Parameter
Group ID
State
DGS-3312SR Gigabit Layer 3 Switch
Figure 4- 8. Port Trunking group window
Figure 4- 9. Port Trunking Configuration window
Description
Select an ID number for the group.
Trunk groups can be toggled between Enabled and Disabled. This is used to turn a
port trunking group on or off. This is useful for diagnostics, to quickly isolate a
bandwidth intensive network device or to have an absolute backup aggregation
group that is not under automatic control.
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