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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
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.
The following fields can be set:
Parameter Description
Master Port <1>
The Master port of link aggregation
group.
Number of
Members <2>
Allows the entry of the number of
contiguous ports that will make up
the link aggregation group. These
ports will be in sequential order from
the Master Port.
State <Disabled>
This field can be toggled between
Enabled and Disabled. This is used
to turn a link aggregation group on
or off. This is useful for diagnostics,
to quickly isolate a bandwidth
intensive network device or to have
an absolute backup link aggregation
group that is not under automatic
control.
Utilities
Layer 2 Switch Utilities
Trivial File Transfer Protocol (TFTP) services allow the switch firmware to be upgraded by transferring a
new firmware file from a TFTP server to the switch. A configuration file can also be loaded into the
switch from a TFTP server, switch settings can be saved to the TFTP server, and a history log can be
uploaded from the switch to the TFTP server.
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