Chapter 4: Web management
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NS3550-8T-2S Industrial Managed Switch User Manual
The Link Aggregation Control Protocol (LACP) provides a standardized means for
exchanging information between partner systems that require high speed redundant
links. Link aggregation permits grouping up to eight consecutive ports into a single
dedicated connection. This feature can expand bandwidth to a device on the network.
LACP operation requires full-duplex mode (refer to the IEEE 802.3ad standard for
further details).
Port link aggregations can be used to increase the bandwidth of a network connection
or to ensure fault recovery. Link aggregation permits grouping up to four consecutive
ports into a single dedicated connection between any two industrial managed switches
or other Layer 2 switches. However, before making any physical connections between
devices, use the link aggregation configuration menu to specify the link aggregation on
the devices at both ends. When using a port link aggregation, note that:
• The ports used in a link aggregation must all be of the same media type (RJ45, 100
Mbps fiber).
• The ports that can be assigned to the same link aggregation have certain other
restrictions (see below).
• Ports can only be assigned to one link aggregation.
• The ports at both ends of a connection must be configured as link aggregation
ports.
• None of the ports in a link aggregation can be configured as a mirror source port
or a mirror target port.
• All of the ports in a link aggregation have to be treated as a whole when moved
from/to, added or deleted from a VLAN.
• The Spanning Tree Protocol will treat all the ports in a link aggregation as a
whole.
• Enable the link aggregation prior to connecting any cable between the switches
to avoid creating a data loop.
• Disconnect all link aggregation port cables or disable the link aggregation ports
before removing a port link aggregation to avoid creating a data loop.
It allows a maximum of 10 ports to be aggregated at the same time. The industrial
managed switch supports Gigabit Ethernet ports (up to five groups). If the group is
defined as a LACP static link aggregationing group, then any extra ports selected are