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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.
Note: If any ports within the trunk group become disconnected,packets intended for the disconnected port will be load shared among the other
uplinked ports of the link aggregation group.
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 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 configure port trunking,click on the
Link Aggregation hyperlink in the Configuration folder to bring up the Port Link Aggregation Group table:
Figure 6- 9.Current Link Aggregation Group Entries window
To configure port trunk groups,click the
Add button to add a new trunk group and use the Link Aggregation Settings menu (see example below) to set
up trunk groups.To modify a port trunk group,click the hyperlinked group number corresponding to the entry you wish to alter.To delete a port trunk group,
click the corresponding
✘ under the Delete heading in the Current Link Aggregation Group Entries table.
Figur
e 6- 10.
Link
Aggr
egation Group Configuration window – Add
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Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch