59 Chapter3
Port Trunk
The Link Aggregation Control Protocol (LACP) provides a standardized means for exchanging
information between Partner Systems on a link to allow their Link Aggregation Control instances to reach
agreement on the identity of the Link Aggregation Group to which the link belongs, move the link to that
Link Aggregation Group, and enable its transmission and reception functions in an orderly manner. Link
aggregation lets you group up to 4 ports into one dedicated connections. This feature can expand
bandwidth to a device on the network. LACP operation requires full-duplex mode, more detail
information refers to IEEE 802.3ad.
Aggregator setting
• System Priority: A value which is used to identify the active LACP. The switch with the lowest value
has the highest priority and is selected as the active LACP.
• Group ID: There are four trunk groups to be selected. Choose the ‘Group ID’ and click .
• LACP: When enabled, the trunk group is using LACP. A port which joins an LACP trunk group has to
make an agreement with its member ports first. When disabled, the trunk group is a static trunk group.
The advantage of having the LACP disabled is that a port joins the trunk group without any
handshaking with its member ports. But member ports won’t know that they should be aggregated
together to form a logic trunk group.
• Work ports: This column field allows the user to type in the total number of active port up to four. With
LACP trunk group, you create a trunk group by connecting two or more switches (e.g. you assign four
ports to be the members of a trunk group whose work ports column field is set as two). The exceed
ports are standby (the Aggregator Information tab will show standby status on the exceed ports) and
can be aggregated if work ports fail. If it is a static trunk group, the number of work ports must equal
the total number of group member ports.
• Select the ports to join the trunk group. The system allows four ports maximum to be aggregated in a
trunk group. Click to add the port which is focused to the left field. To remove unwanted ports,
select the port and click .
• When LACP enabled, you can configure LACP Active/Passive status for each port on State Activity
page.
• Click .
• Use to delete Trunk Group. Select the Group ID and click .