D-Link xStack DGS-3600 Series User Manual - Link Aggregation
xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch
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 Switch allows the creation of up to 32 link aggregation groups, each group consisting of 2 to 8 links (ports). All of the ports in
the group must be members of the same VLAN, and their STP status, static multicast, traffic control, traffic segmentation, port
bandwidth and 802.1p default priority configurations must be identical. Port security, port mirroring and 802.1X must not be
enabled on the trunk group. Further, the aggregated links must all be of the same speed when in the LACP state and should be
configured as full duplex.
The Master Port of the group is to be configured by the user, 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.
Link Aggregation
To configure port trunking, click on the
Link Aggregation
hyperlink in the
Trunking
folder under
L2 Features
to bring up the
following window:
Figure 7- 12. Port Link Aggregation Group window
To configure port trunk groups, click the
Add
button to add a new trunk group and use the
Link Aggregation Group
Configuration
window (see example below) to set up trunk groups. To modify a port trunk group, click the Hyperlinked Group
ID. To delete a port trunk group, click the corresponding under the Delete heading in the
Link Aggregation Group Entries
table.
Figure 7- 13. Link Aggregation Group Configuration – Add
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