D-Link xStack DES-3528 series User Manual page 96

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xStack DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual
ports, which can only belong to a single link aggregation group. All of the ports in the group must be members of the
same VLAN, and their STP status, static multicast, traffic control; traffic segmentation and 802.1p default priority
configurations must be identical. Port locking, port mirroring and 802.1X must not be enabled on the trunk group.
Further, the aggregated links must all be of the same speed 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.
To view the Trunking Settings window click L2 Features > Port Trunking
The following fields can be set
Parameter Description
Algorithm
The algorithm that the Switch uses to balance the load across the ports that make up the port
trunk group is defined by this definition. Choose MAC Source, MAC Destination, MAC Source
Dest, IP Source, IP Destination or IP Source Dest (See the Link Aggregation section of this
manual).
Group ID
Select an ID number for the group, between 1 and 8.
Type
This pull-down menu allows you to select between Static and LACP (Link Aggregation Control
Protocol). LACP allows for the automatic detection of links in a Port Trunking Group.
Master Port
Choose the Master Port for the trunk group using the pull-down menu.
State
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.
Active Port
Shows the port that is currently forwarding packets.
Member Ports
Choose the members of a trunked group. Up to eight ports per group can be assigned to a
group.
Flooding Port
A trunking group must designate one port to allow transmission of broadcasts and unknown
unicasts.
Click Apply to implement changes made.
Figure 3 - 31 Port Trunking window
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